顔写真

フクシマ ジユン
福島 潤
Jun Fukushima
所属
大学院工学研究科 応用化学専攻 分子システム化学講座(極限材料創製化学分野)
職名
助教
学位
  • 博士(工学)(名古屋大学)

  • 修士(工学)(名古屋大学)

経歴 1

  • 2012年4月 ~ 継続中
    東北大学 大学院工学研究科 応用化学専攻 助教

学歴 3

  • 名古屋大学 大学院工学研究科 エネルギー理工学専攻

    2010年4月 ~ 2012年3月

  • 名古屋大学 大学院工学研究科 エネルギー理工学専攻

    2008年4月 ~ 2010年3月

  • 名古屋大学 工学部 物理工学科

    2004年4月 ~ 2008年3月

委員歴 14

  • 日本電磁波エネルギー応用学会 理事

    2021年5月 ~ 継続中

  • 日本電磁波エネルギー応用学会 機関誌・論文誌編集委員会総務

    2020年4月 ~ 継続中

  • R024 電磁波励起反応場委員会 装置・計測ワーキンググループ幹事

    2020年4月 ~ 継続中

  • R024 電磁波励起反応場委員会 運営・広報・情報収集ワーキンググループ幹事

    2020年4月 ~ 継続中

  • 鉄鋼協会 無容器プロセス研究Gr主査

    2015年4月 ~ 継続中

  • 日本電磁波エネルギー応用学会 JEMEA活性化ワーキンググループ幹事

    2021年5月 ~ 継続中

  • 日本電磁波エネルギー応用学会 シンポジウム実行委員会幹事

    2021年6月 ~ 2021年10月

  • 日本化学会東北支部 会計幹事

    2020年3月 ~ 2021年2月

  • 日本電磁波エネルギー応用学会 シンポジウム実行委員会幹事

    2020年6月 ~ 2020年11月

  • 日本電磁波エネルギー応用学会 若手会代表幹事

    2019年4月 ~ 2020年3月

  • 日本学術振興会産学協力研究委員会 電磁波励起反応場 第 188 委員会 運営・広報ワーキンググループ幹事

    2019年4月 ~ 2020年3月

  • 日本学術振興会産学協力研究委員会 電磁波励起反応場 第 188 委員会 学界幹事

    2017年4月 ~ 2019年3月

  • 日本電磁波エネルギー応用学会 シンポジウム実行委員会幹事

    2018年6月 ~ 2018年10月

  • 第9回日本電磁波エネルギー応用学会シンポジウム 実行委員

    2014年6月 ~ 2015年11月

︎全件表示 ︎最初の5件までを表示

所属学協会 7

  • 無機マテリアル学会

  • 日本セラミックス協会

  • 日本金属学会

  • 日本鉄鋼協会

  • 粉体粉末冶金協会

  • 日本化学会

  • 日本電磁波エネルギー応用学会

︎全件表示 ︎最初の5件までを表示

研究キーワード 7

  • ハイスループット合成

  • カーボンリサイクル

  • その場計測

  • 固体化学

  • 無機材料

  • 粉末冶金

  • マイクロ波プロセッシング

研究分野 6

  • ナノテク・材料 / 基礎物理化学 /

  • ナノテク・材料 / グリーンサステイナブルケミストリー、環境化学 /

  • ナノテク・材料 / 無機物質、無機材料化学 /

  • ものづくり技術(機械・電気電子・化学工学) / 反応工学、プロセスシステム工学 /

  • 環境・農学 / 環境負荷低減技術、保全修復技術 /

  • ナノテク・材料 / 無機材料、物性 /

受賞 7

  1. 進歩賞

    2022年11月 日本セラミックス協会 マイクロ波非平衡プロセッシングによる機能性セラミックス合成

  2. 平成28年度JEMEA進歩賞

    2017年5月31日 日本電磁波エネルギー応用学会

  3. 講演奨励賞

    2016年11月 無機マテリアル学会

  4. トーキン財団奨励賞

    2015年3月5日 公益財団法人トーキン科学技術振興財団

  5. 2GCMEA Rustam Roy Award

    2012年10月 Microwave Working Group, IMPI, AMPERE, JEMEA, China MW Representatives, India MW Representatives Thermodynamics on MW Processing with Non-Thermal Effects

  6. 優秀講演論文賞

    2011年10月 粉体粉末冶金協会

  7. ベストペーパー賞

    2011年11月 日本電磁場エネルギー応用学会

︎全件表示 ︎最初の5件までを表示

論文 103

  1. Kinetics of CO<sub>2</sub> splitting by microwave irradiation using honeycomb-like pellets of Fe<sub>3</sub>O<sub>4</sub>/FeO 査読有り

    Jun Fukushima, Masahiro Tanaka, Sadatsugu Takayama, Hirotsugu Takizawa

    Chemical Engineering Journal 428 2022年1月15日

    DOI: 10.1016/j.cej.2021.131087  

    ISSN:1385-8947

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    Thermochemical fuel production is expected to improve CO2 utilization, and two-step chemical looping processes such as those driven by solar energy are being investigated extensively. In this study, CO2 splitting was performed under microwave irradiation using iron oxides (Fe3O4 and FeO) as the reducing agents. In addition, honeycomb-like pellets of the oxides were used to increase the contact area with the CO2 gas and prevent sintering at high temperatures. The microwave radiation could heat both Fe3O4 powder and the honeycomb-like pellets of the two iron oxides rapidly. The kinetics of the reduction of CO2 to CO under microwave irradiation were investigated by in-situ gas analysis. The apparent activation energy as calculated from the Arrhenius plot was 76.1 kJ/mol for the Fe3O4 powder, 48.3 kJ/mol for the honeycomb-like FeO pellets, and 25.3 kJ/mol for the honeycomb-like Fe3O4 pellets. The proposed microwave-based process for CO2 splitting using honeycomb-like pellets is a promising one for the processing of large amounts of CO2 gas per unit time.

  2. Enhancement of Fixed-bed Flow Reactions under Microwave Irradiation by Local Heating at the Vicinal Contact Points of Catalyst Particles 査読有り

    Naoto Haneishi, Shuntaro Tsubaki, Eriko Abe, Masato M. Maitani, Ei ichi Suzuki, Satoshi Fujii, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

    Scientific Reports 9 (1) 2019年12月1日

    DOI: 10.1038/s41598-018-35988-y  

    eISSN:2045-2322

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    © 2019, The Author(s). The formation of local high temperature regions, or so-called “hot spots”, in heterogeneous reaction systems has been suggested as a critical factor in the enhancement of chemical reactions using microwave heating. In this paper, we report the generation of local high temperature regions between catalyst particles under microwave heating. First, we demonstrated that reaction rate of the dehydrogenation of 2-propanol over a magnetite catalyst was enhanced 17- (250 °C) to 38- (200 °C) fold when heated with microwave irradiation rather than an electrical furnace. Subsequently, the existence of microwave-generated specific local heating was demonstrated using a coupled simulation of the electromagnetic fields and heat transfer as well as in situ emission spectroscopy. Specific high-temperature regions were generated at the vicinal contact points of the catalyst particles due to the concentrated microwave electric field. We also directly observed local high temperature regions at the contact points of the particles during microwave heating of a model silicon carbide spherical material using in situ emission spectroscopy. We conclude that the generation of local heating at the contact points between the catalyst particles is a key factor for enhancing fixed-bed flow reactions under microwave irradiation.

  3. Linear magnetic field dependence of the magnetodielectric effect in eutectic BaTiO3-CoFe2O4 multiferroic material fabricated by containerless processing 査読有り

    J. Fukushima, K. Ara, T. Nojima, S. Iguchi, Y. Hayashi, H. Takizawa

    Applied Physics Letters 112 (21) 212903 2018年5月21日

    出版者・発行元:American Institute of Physics Inc.

    DOI: 10.1063/1.5025072  

    ISSN:0003-6951

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    To maximize the formation of an anisotropic interface between the magnetostrictive phase and the electrostrictive phase, a eutectic BaTiO3-CoFe2O4 multiferroic material is fabricated by containerless processing. The composites in this process had a fine eutectic structure, especially at a eutectic composition of BaTiO3:CoFe2O4 = 62:38. TEM observations revealed that the (1 0 0) plane of tetragonal BaTiO3 and the (1 0 0) plane of CoFe2O4 were oriented in parallel. In addition to the largest magnetodielectric effect in the eutectic-composition samples, we confirmed the permittivity is controlled linearly by applying a high magnetic field through forced magnetostriction. So far, the peak of the magnetodielectric effect around 0.25 T has been only found in the sintered CoFe2O4 polycrystalline sample. Thus, the containerless processing provides us a route to produce an ideal microstructure without accompanying 90° domain wall process and rotational magnetization process, which enhances the magnetodielectric effect.

  4. Microwave synthesis of carbon-coated Ti4O7 nanorods by rapid carbothermal reduction processing 査読有り

    Jun Fukushima, Tomohiro Takeuchi, Yamato Hayashi, Hirotsugu Takizawa

    Chemical Engineering and Processing - Process Intensification 125 27-33 2018年3月1日

    出版者・発行元:Elsevier B.V.

    DOI: 10.1016/j.cep.2018.01.002  

    ISSN:0255-2701

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    Carbon-coated Ti4O7 nanorods were synthesized using a carbothermal reduction reaction. With microwave processing, single-phase Ti4O7 was obtained at 975 °C after a holding time of 30 min, and field-emission scanning electron microscopy (FE-SEM) results confirmed that no grain growth occurred. The transmission electron image confirmed that the Ti4O7 nanorods were coated with carbon. In contrast, Ti4O7 and a trace amount of Ti5O9 phase were observed after heating in a tube furnace at 975 °C with a 30 min hold time. In addition, nanorod grain growth clearly occurred, and no carbon coating was observed after heating in the tube furnace heating. These results suggest that polyvinylpyrrolidone-derived carbon was uniformly coated on pristine TiO2 nanorods via microwave processing, which can achieve about 70 times faster heating than tube-furnace heating. Therefore, the uniform carbon coating inhibited the grain growth of reduced titania at a high temperature. In conclusion, we successfully prepared carbon-coated Ti4O7 nanorods that retained the morphology of the pristine TiO2 nanorods.

  5. In situ spectroscopic analysis of the carbothermal reduction process of iron oxides during microwave irradiation 査読有り

    Jun Fukushima, Hirotsugu Takizawa

    Metals 8 (1) 49-58 2018年1月11日

    出版者・発行元:MDPI AG

    DOI: 10.3390/met8010049  

    ISSN:2075-4701

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    The effects of microwave plasma induction and reduction on the promotion of the carbothermal reduction of iron oxides (α-Fe2O3, γ-Fe2O3, and Fe3O4) are investigated using in situ emission spectroscopy measurements during 2.45 GHz microwave processing, and the plasma discharge (such as CN and N2) is measured during microwave E-field irradiation. It is shown that CN gas or excited CN molecules contribute to the iron oxide reduction reactions, as well as to the thermal reduction. On the other hand, no plasma is generated during microwave H-field irradiation, resulting in thermal reduction. Magnetite strongly interacts with the microwave H-field, and the reduction reaction is clearly promoted by microwave H-field irradiation, as well as thermal reduction reaction.

  6. Metal ion plasma generation under strong magnetic field in microwave resonator 査読有り

    Satoshi Fujii, Jun Fukushima

    AIP Advances 13 (1) 015320 2023年1月

    DOI: 10.1063/5.0134071  

  7. Microwave-assisted titanium nitride coating processing using nitride powders in ambient atmosphere

    Nozomi Iizuka, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    Journal of Alloys and Compounds 908 164606-164606 2022年7月

    出版者・発行元:Elsevier BV

    DOI: 10.1016/j.jallcom.2022.164606  

    ISSN:0925-8388

  8. C-axis texture of high-rate-sputtered Nd<sub>2</sub>Fe<sub>14</sub>B thin films: independence of sheet texture of Mo underlayer

    Takayuki Tsuchida, Jun Fukushima, Shin Saito, Yamato Hayashi, Hirotsugu Takizawa

    Japanese Journal of Applied Physics 61 (6) 065506-065506 2022年6月1日

    出版者・発行元:IOP Publishing

    DOI: 10.35848/1347-4065/ac6c10  

    ISSN:0021-4922

    eISSN:1347-4065

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    Abstract In this study, we investigated the effects of the sheet texture of the Mo underlayer on the c-axis texture of the high-rate-sputtered Nd<sub>2</sub>Fe<sub>14</sub>B phase. The magnetic properties revealed that the squareness of the Nd–Fe–B magnetic layer did not depend on the sheet texture of the Mo underlayer but on the substrate temperature: large squareness was obtained when the magnetic layer was sputtered at high substrate temperature above 500 °C. In-plane X-ray diffraction measurements indicated that the intensity of diffraction from the Nd<sub>2</sub>Fe<sub>14</sub>B (410) plane did not depend on the sheet texture of the Mo underlayer but on the substrate temperature: high intensity was obtained when the magnetic layer was sputtered at above 500 °C, which was consistent with magnetic properties. These results support that the c-axis texture of the high-rate-sputtered magnetic layer was driven by the c plane with the lowest surface energy among the crystal planes in the Nd<sub>2</sub>Fe<sub>14</sub>B phase.

  9. O-13 マイクロ波によるリグノセルロースの触媒的急速熱分解の促進

    椿 俊太郎, 濱田 由紀, 小原 則子, 福島 潤, 西岡 将輝, 杉山 武晴, 永長 久寛, 田 旺帝, 和田 雄二, 安田 誠

    バイオマス科学会議発表論文集 17 29-30 2022年1月12日

    出版者・発行元:一般社団法人 日本エネルギー学会

    DOI: 10.20550/jiebiomassronbun.17.0_29  

    ISSN:2423-8333

    eISSN:2423-8341

  10. Low-temperature hydrogen reduction of iron oxide by controlling the water potential using a CaH2 drying agent 査読有り

    Takayuki Tsuchida, Jun Fukushima, Masahiro Tobise, Yamato Hayashi, Hirotsugu Takizawa

    Journal of Solid State Chemistry 302 122441-122441 2021年10月

    出版者・発行元:Elsevier BV

    DOI: 10.1016/j.jssc.2021.122441  

    ISSN:0022-4596

  11. Reduction of metal oxides using thermogravimetry under microwave irradiation

    Satoshi Fujii, Masahiro Yamamoto, Naoto Haneishi, Shuntaro Tsubaki, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

    AIP Advances 11 (6) 2021年6月1日

    DOI: 10.1063/5.0050907  

    eISSN:2158-3226

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    Chemical reactions performed under microwave irradiation often demonstrate high reaction rates, high selectivity, and low reaction temperatures, which allows for more compact reactors and more energy-efficient processes than used in conventional heating methods. In this study, we discovered a new chemical reaction and proposed a new material synthesis method, performed using a solid-state microwave source with an oscillator and a single-mode cavity. We developed a microwave heating thermogravimetry apparatus to confirm that microwave irradiation reduced the temperature of the reduction process. Next, we applied this apparatus to the reduction process of copper oxide with carbon as the reducing agent and compared microwave heating with conventional heating. We demonstrated that the reduction temperature of microwave heating was 192 °C in a magnetic (H) field and 265 °C in an electric (E) field, which were lower than those of conventional heating. For microwave heating in the E-field, plasma strongly affected the reaction process, leading to a reduction in the reaction temperature. For microwave heating in the H-field, localized heating occurred and the average reaction temperature was lower. Using the obtained results, an applicator suitable for these modes can be designed, enabling a reduction process with an additional energy-saving effect.

  12. Sonochemical effect and pore structure tuning of silica xerogel by ultrasonic irradiation of semi-solid hydrogel

    Yuki Maeda, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    Ultrasonics Sonochemistry 73 2021年5月

    DOI: 10.1016/j.ultsonch.2021.105476  

    ISSN:1350-4177

    eISSN:1873-2828

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    Silica xerogels were prepared by the sol-gel method under ultrasonic irradiation, using tetraethylorthosilicate (TEOS) as the starting material. Hexamethyldisiloxane (HMDSO) was used as the hydrophobizing agent. When preparing silica xerogel, it is necessary to perform aging and hydrophobization to suppress shrinkage during ambient pressure drying, however, such treatments are time-consuming. In this study, the semi-solid hydrogel was irradiated with ultrasonic for the first time in order to accelerate aging and hydrophobic treatment, and the effect of ultrasonic frequency on structure was investigated. Firstly, ultrasonic irradiation was performed at frequencies of 100 kHz and 500 kHz, followed by hydrophobic treatment at a frequency of 500 kHz, in order to promote aging. The results identify optimum conditions for ultrasonic irradiation to promote aging and hydrophobization reactions, and it was found to be possible to prepare silica xerogels in less than 1/5 of the conventional time. The silica xerogels had a low density and the shrinkage was suppressed. In this study, it was found that ultrasonic irradiation of semi-solid hydrogel was very effective for promoting the reaction.

  13. Decrease in the crystallite diameter of solid crystalline magnetite around the curie temperature by microwave magnetic fields irradiation

    Takayuki Tsuchida, Jun Fukushima, Hirotsugu Takizawa

    Nanomaterials 11 (4) 2021年4月

    DOI: 10.3390/nano11040984  

    eISSN:2079-4991

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    A decrease in the crystallite diameter of ferrites irradiated with microwaves has been considered as a non-thermal effect of so-called de-crystallization; however, its mechanism has not been elucidated. We hypothesized that a decrease in the crystallite diameter is caused by interaction between the ordered spins of ferrite and the magnetic field of microwaves. To verify this, we focused on magnetite with a Curie temperature of 585 C. Temperature dependence around this temperature and time dependence of the crystallite diameter of the magnetite irradiated with microwaves at different temperatures and durations were investigated. From the X-ray diffraction data, the crystallite diameter of magnetite exhibited a minimum value at 500 C, just below the Curie temperature of magnetite, where the energy loss of the interaction between magnetite’s spins and the microwaves takes the maximum value. The crystallite diameter exhibited a minimum value at 5 min irradiation time, during which the microwaves were excessively absorbed. Transmission electron microscopy observations showed that the microstructure of irradiated magnetite in this study was different from that reported previously, indicating that a decrease in the crystallite diameter is not caused by de-crystallization but its similar phenomenon. A decrease in coercivity and lowering temperature of Verwey transition were observed, evidencing decreased crystallite diameter. This study can thus contribute to the development of the theory of a non-thermal effect. ◦ ◦

  14. Room-temperature synthesis of γ-Ga<inf>2</inf>O<inf>3</inf> nanoparticles from gallium metal via ultrasound irradiation

    Yuki Takano, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    Advanced Powder Technology 32 (3) 860-865 2021年3月

    DOI: 10.1016/j.apt.2021.01.032  

    ISSN:0921-8831

    eISSN:1568-5527

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    In this study, gallium oxide (Ga O ) nanoparticles were synthesized by sonochemical techniques at room temperature. We investigate the ultrasound irradiation conditions and the solvent type to synthesize Ga O nanoparticles. γ-Ga O nanoparticles were synthesized by irradiating gallium metal with ultrasound in hydrazine monohydrate solvent. The irradiation of hydrazine with ultasound suppresses the generation of ·OH, and GaOOH was not formed, and gallium metal directly oxidized. When the synthesized γ-Ga O nanoparticles were heat-treated, a transition to β-Ga O was observed. The heat-treated Ga O nanoparticles showed excellent photocatalytic activity for the decomposition of RhB under UV irradiation. 2 3 2 3 2 3 2 3 2 3 2 3

  15. Microwave Irradiation Process for Al–Sc Alloy Production 査読有り

    Satoshi Fujii, Eiichi Suzuki, Naomi Inazu, Shuntaro Tsubaki, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

    Scientific Reports 10 (1) 2020年12月1日

    DOI: 10.1038/s41598-020-59664-2  

    eISSN:2045-2322

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    © 2020, The Author(s). Scandium is being explored as an alloying element for aluminium alloys, which are gaining importance as high-performance lightweight structural alloys in the transportation industry. Sc-rich ScAlN thin films show strong piezoelectricity and can be fabricated on a hard substrate for use as wideband surface acoustic wave filters in next-generation wireless mobile communication systems. However, the use of ScAlN thin films in microelectromechanical system devices is limited by the high cost of metallic Sc, which is due to the difficulty in smelting of this material. Here, we propose a novel microwave irradiation process for producing Al-Sc alloys, with Mg ions as a reducing agent. Although scandium oxide is thermodynamically stable, intermetallic Al3Sc is obtained in high yield (69.8%) via a low-temperature (660 °C) reduction reaction under microwave irradiation. Optical spectroscopy results and thermodynamic considerations suggest a non-thermal equilibrium reaction with the univalent magnesium ions excited by microwave irradiation.

  16. Fabrication and growth of c -axis textured Nd<inf>2</inf>Fe<inf>14</inf>B thin films by high-rate sputtering

    Takayuki Tsuchida, Jun Fukushima, Shintaro Hinata, Yamato Hayashi, Shin Saito, Hirotsugu Takizawa

    Journal of Applied Physics 127 (10) 2020年3月14日

    DOI: 10.1063/1.5143056  

    ISSN:0021-8979

    eISSN:1089-7550

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    To apply Nd-Fe-B thin films for mass-produced heat-assisted magnetic recording media, we investigated the high-rate sputtering conditions required to obtain c-axis textured Nd Fe B thin films and analyzed the growth mechanism. Magnetization curves indicated that higher substrate temperatures and sputtering rates resulted in a higher degree of perpendicular magnetic anisotropy; a Nd-Fe-B layer deposited at a substrate temperature (T ) of 600 °C and a sputtering rate (R ) of 2.6 nm/s had the easy axis perpendicular to the film plane. The dependence of the magnetic properties on the sputtering rate was due to a decrease in the substrate temperature during sputtering; there was a threshold for obtaining a high squareness ratio. X-ray diffraction analysis and transmission electron microscopy (TEM) images showed that the c-axis textured Nd Fe B crystal phase was formed in the Nd-Fe-B layer deposited at T = 600 °C and R = 2.6 nm/s, which resulted in the highly perpendicular magnetic anisotropy. In addition, the TEM images showed a layer of Nd Fe B with no obvious lattice fringes near the interface between the Nd-Fe-B layer and Mo underlayer, while the lattice fringes of the Nd Fe B phase were not parallel to this interface but gently curved along the Mo cap layer. We propose that the c-axis orientation was achieved by the rotation of the c plane, which has the lowest surface energy in the Nd Fe B phase, toward the vacuum-side surface during sputtering. 2 14 sub_0 sp 2 14 sub_0 sp 2 14 2 14 2 14

  17. Nitridation reaction of titanium powders by 2.45 ghz multimode microwave irradiation using a SiC susceptor in atmospheric conditions 査読有り

    Jun Fukushima, Keiichiro Kashimura, Hirotsugu Takizawa

    Processes 8 (1) 2020年1月1日

    DOI: 10.3390/pr8010020  

    eISSN:2227-9717

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    © 2019 by the authors. A titanium nitride (TiN) coating using microwaves can be accomplished in air, and satisfies the required conditions of an on-demand TiN coating process. However, the coating mechanism using microwaves is not completely clear. In this study, to understand the detailed mechanism of microwave titanium nitridation in air, the quantity of nitrogen and oxygen in reacted TiN powder has been investigated by an inert melting method. Titanium powders were irradiated with microwaves by a multi-mode type 2.45 GHz microwave irradiation apparatus, while also being held at various temperatures for two different dwell times. X-ray diffraction (XRD) results revealed that nitridation of the powder progressed with increasing process temperature, and the nitridation corresponds to the powder color after microwave irradiation. The nitrogen contents of the samples increased with increasing processing temperature and dwell time, unlike oxygen. It is postulated that the reaction of convected air with titanium is a key role to control nitridation in this system.

  18. Microwave Heating Behavior in SiC Fiber-MO2 Mixtures (M = Ce, Zr)—Selective Heating of Micrometer-Sized Fibers Facilitated by ZrO2 Powder

    Keiichiro Kashimura, Jun Fukushima, Tomoaki Namioka, Takashi Fujii, Hirotsugu Takizawa, Hideoki Fukushima

    Processes 8 (1) 47-47 2020年1月1日

    出版者・発行元:MDPI AG

    DOI: 10.3390/pr8010047  

    eISSN:2227-9717

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    SiC fiber-MO2 (M = Ce, Zr) mixtures with various compositions were heated by applying an 80 W microwave electric field, to investigate their heating rate, maximum temperature, and dielectric constant. For the SiC fiber-CeO2 mixture, all three parameters continued to increase as the weight ratio of the SiC fiber increased; in contrast, for the SiC fiber-ZrO2 mixture, these parameters reached a maximum value at a certain composition. A thermal gradient of 500 °C was observed at a microlevel in the SiC fiber-ZrO2 mixture, and hot spots were located in regions with a certain composition. This result not only contributes to designing a novel good microwave absorber but also presents new aspects with regard to high-temperature microwave processing, including the mechanism behind the high-temperature gradients on the order of micrometers as well as engineering applications that utilize these high-temperature gradients.

  19. In-situ high spatial resolution two-color thermography in microwave selective heating system 査読有り

    福島 潤

    MS and T 2019 - Materials Science and Technology 2019 194-201 2019年11月

  20. High-pressure synthesis and crystal structure of a novel intermetallic compound Mn(Al,Ge)5

    Takuya Sasaki, Takashi Kato, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    Journal of Alloys and Compounds 806 58-62 2019年10月

    出版者・発行元:Elsevier BV

    DOI: 10.1016/j.jallcom.2019.07.239  

    ISSN:0925-8388

  21. Synthesis of high aspect ratio silver nanowire precursor by two-step ultrasonic irradiation and its application to transparent conductive film 査読有り

    Journal of the Ceramic Society of Japan 127 (10) 655-662 2019年10月

    DOI: 10.2109/jcersj2.19068  

  22. In-situ spectroscopy and two-color thermography during microwave irradiation in materials processing 査読有り

    福島 潤

    AMPERE 2019 - 17th International Conference on Microwave and High Frequency Heating 373-377 2019年10月

  23. Effect of multimode and single-mode microwave processing of anisotropic grain growth of CuFeO2 査読有り

    福島 潤

    Asia-Pacific Microwave Conference Proceedings 2018 1630-1632 2019年1月

    DOI: 10.23919/APMC.2018.8617648  

  24. Size Control of Ti<SUB>4</SUB>O<SUB>7</SUB> Nanoparticles by Carbothermal Reduction Using a Multimode Microwave Furnace 査読有り

    J. Fukushima, H. Takizawa

    Crystals 8 (12) 444-452 2018年11月

    DOI: 10.3390/cryst8120444  

  25. Kinetics of microwave synthesis of AlN by carbothermal-reduction–nitridation at low temperature 査読有り

    H. Chikami, J. Fukushima, Y. Hayashi, H. Takizawa

    Journal of the American Ceramic Society 101 (11) 4905-4910 2018年7月

    DOI: 10.1111/jace.15903  

  26. Containerless melting and synthesis of eutectic BaTiO3/CoFe2O4 by microwave irradiation 査読有り

    Jun Fukushima, Kentaro Ara, Yamato Hayashi, Hirotsugu Takizawa

    Materials Letters 216 42-45 2018年4月1日

    出版者・発行元:Elsevier B.V.

    DOI: 10.1016/j.matlet.2017.12.133  

    ISSN:1873-4979 0167-577X

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    Eutectic BaTiO3/CoFe2O4 was synthesized using a developed BN diffuser by containerless microwave processing. The crystallized BaTiO3 and CoFe2O4 was obtained from melt of quinary system Ba-Ti-Co-Fe-O. Samples included eutectic BaTiO3/CoFe2O4 structure with fine dendrite structure and primary crystal of CoFe2O4. The microstructure became finer with decreasing the weight ratio of CoFe2O4. The microstructure was finer in solidification with levitation than in solidification without levitation.

  27. Synthesis and photoluminescence properties of a novel Sr2Al6O11:Mn4+ red phosphor prepared with a B2O3 flux 査読有り

    Takuya Sasaki, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    JOURNAL OF LUMINESCENCE 194 446-451 2018年2月

    出版者・発行元:ELSEVIER SCIENCE BV

    DOI: 10.1016/j.jlumin.2017.10.076  

    ISSN:0022-2313

    eISSN:1872-7883

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    A novel Mn4+-doped aluminate red phosphor Sr2Al6O11: Mn4+ was synthesized by a solid-state reaction, and we investigated its photoluminescence properties. Sr2Al6O11, which has a similar structure to Sr4Al14O25, was formed as the main phase after heating alpha-alumina, strontium carbonate, manganese dioxide, and magnesium oxide with 2.5% (B2O3) at 1000 degrees C for 12 h or more. The Sr2Al6O11: Mn4+ phosphor exhibited red photoluminescence with peaks at around 652 and 665 nm, which arise from the spin-forbidden transition of the Mn4+ cation from the E-2 to the (4)A(2) state. The phosphor can be excited by near ultraviolet or blue LED light because it had a broad excitation band from the near-ultraviolet to the blue light region. The emission intensity was increased by co-doping with Mg2+ cations, which act as charge compensators. The amount of Mg required for the most effective charge compensation was 10 times the optimum Mn concentration. From these results, we confirmed that Sr2Al6O11 could act as the host structure for Mn4+-doped phosphors.

  28. Effect of aspect ratio on the permittivity of graphite fiber in microwave heating 査読有り

    Jun Fukushima, Shuntaro Tsubaki, Tomoki Matsuzawa, Keiichiro Kashimura, Tomohiko Mitani, Tomoaki Namioka, Satoshi Fujii, Naoki Shinohara, Hirotsugu Takizawa, Yuji Wada

    Materials 11 (1) 169-182 2018年1月22日

    DOI: 10.3390/ma11010169  

    eISSN:1996-1944

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    © 2018 by the authors. Microwave (MW) heating has received attention as a new heating source for various industrial processes. Some materials are expected to be a more effective absorber ofMW, and graphite is observed as a possible candidate for high-temperature application. We investigated the dependence of the aspect ratio of graphite fibers on both their heating behavior and permittivity under a 2.45 GHz MW electric field. In these experiments, both loss tangent and MW heating behavior indicated that the MW absorption of conductive fibers increases with their aspect ratio. The MW absorption was found to be well accounted for by the application of a spheroidal model for a single fiber. The absorption of graphite fibers decreases with increasing aspect ratio when the long axis of the ellipsoid is perpendicular to the electric field, whereas it increases with the aspect ratio when the long axis is parallel to the electric field. The analytical model indicated that MW heating of the conductive fibers is expected to depend on both the shape and arrangement of the fibers in the electric field.

  29. Microwave synthesis of Ti4O7 or AlN nanoparticles by rapid carbothermal reduction process 査読有り

    Jun Fukushima, Hirotsugu Takizawa

    Journal of the Japan Petroleum Institute 61 (2) 88-97 2018年

    出版者・発行元:Japan Petroleum Institute

    DOI: 10.1627/jpi.61.88  

    ISSN:1349-273X 1346-8804

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    Microwave processing was used to fabricate nanoparticles having a desired particle size and morphology by a simple method, carbothermal reduction method. By microwave processing, Ti4O7 nanoparticles (∼ 60 nm) maintaining the morphology of a pristine material were fabricated at 950 °C for 30 min. Since grain growth was observed in conventional processing, rapid heating (250 °C/min∼) and rapid cooling, which are features of the microwave processing, are also effective in maintaining the particle diameter even though this carbothermal reduction reaction proceeds in the high temperature region. In addition, we successfully synthesized spherical AlN nanoparticles with high nitridation rate, maintaining the morphology of pristine material by microwave processing. It is considered that the crystal structure of transition alumina (which is advantageous for formation of intermediate AlON but phase transition over 1200 °C) was maintained over 1300 °C by microwave rapid heating. In addition, by optimizing the nitrogen flow rate, spherical AlN nanoparticles having a nitridation ratio of 0.88 could be fabricated at 1200 °C for 180 min and a nitrogen flow rate of 0.2 L/min.

  30. Microwave irradiation effects on the spinodal decomposition of TiO<SUB>2</SUB>-VO<SUB>2</SUB> system 査読有り

    S. Aoyagi, J. Fukushima, Y. Hayashi, H. Takizawa, 青柳 宗一郎, 福島 潤, 林 大和, 滝澤 博胤

    JEMEA Bulletin 1 9-16 2017年12月22日

  31. Synthesis and photoluminescence properties of a novel aluminosilicate Sr3Al10SiO20:Mn4+ red phosphor 査読有り

    Takuya Sasaki, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    JOURNAL OF LUMINESCENCE 188 101-106 2017年8月

    出版者・発行元:ELSEVIER SCIENCE BV

    DOI: 10.1016/j.jlumin.2017.04.014  

    ISSN:0022-2313

    eISSN:1872-7883

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    A novel aluminosilicate red phosphor Sr3Al10SiO20:Mn4+, which has some octahedral sites, was synthesized by a solid-state reaction, and we investigated its photoluminescence properties. Sr3Al10SiO20 doped with tetravalent manganese showed a red photoluminescence transition from E-2 to (4)A(2) after excitation in the near ultraviolet region to the blue region in the visible spectrum. The Sr3Al10SiO20:Mn4+ synthesized at 1500 degrees C for 6 h exhibited maximum emission intensity. From these results, it was confirmed that aluminosilicates could be the host structure for Mn4+ -doped phosphors.

  32. Effects of Al- and Sn-substitution on photoluminescence properties of Mn4+-doped spinel-type Mg2TiO4 phosphor 査読有り

    Takuya Sasaki, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    JOURNAL OF LUMINESCENCE 187 540-545 2017年7月

    出版者・発行元:ELSEVIER SCIENCE BV

    DOI: 10.1016/j.jlumin.2017.03.026  

    ISSN:0022-2313

    eISSN:1872-7883

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    Solid solution phosphors in which the octahedral sites Mg2TiO4:Mn4+ were substituted by Al3+ and Sn4+ were synthesized and the relationship between the coordination environment of Mn4+ and the emission wavelength was investigated. Mn4+-doped Mg2TiO4-MgAl2O4 and Mg2TiO4-Mg2SnO4 red phosphors were prepared by a solid-state reaction. Mg2-xTi1-xAl2xO4:Mn4+ and Mg(2)Ti(1-y)SnyO(4):Mn4+ were synthesized at 1400 degrees C and 1200 degrees C, respectively. The crystal structure parameters were refined using the RIETAN-FP program and the average bond lengths were calculated from the refined crystal structures of Mg2-xTi1-xAl2xO4:Mn4+ and Mg(2)Ti(1-y)SnyO(4):Mn4+. The emission peak of the Al-substituted sample shifted toward shorter wavelengths with increasing Al concentration, whereas the emission peak of the Sn-substituted sample shifted toward longer wavelengths with increasing Sn concentration. In the E-2 -&gt;(4)A(2) transition, the emission peak wavelength of the Mn4'-activated spinet-type solid solution increased almost linearly with increasing average bond length between cation and anion in octahedral sites, L-oct. These results indicate that there is a strong positive correlation between Loa and the emission peak wavelength for the solid solution compositions studied in this work. (C) 2017 Elsevier B.V. All rights reserved.

  33. In situ analysis of reaction kinetics of reduction promotion of NiMn2O4 under microwave H-field irradiation 査読有り

    Jun Fukushima, Sadatsugu Takayama, Hiroshi Goto, Motoyasu Sato, Hirotsugu Takizawa

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19 (27) 17904-17908 2017年7月

    出版者・発行元:ROYAL SOC CHEMISTRY

    DOI: 10.1039/c7cp02728a  

    ISSN:1463-9076

    eISSN:1463-9084

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    Reaction kinetics during microwave H-field heating and electric furnace heating were investigated to verify the effect of rapid heating and the non-thermal microwave effect. This work is focused on the ferromagnetic material NiMn2O4, and the reduction reaction under rapid heating is investigated using an in situ analysis device. The results showed that the activation energy varied with the heating rate under microwave H-field irradiation, and it was the same as that in an electric furnace when the heating rate was the same. On the other hand, under microwave H-field irradiation, the reduction reaction began from a significantly low temperature compared with that of electric furnace heating. The results suggest that the transition theory during microwave irradiation should be expanded to include the effect of spin waves excited by a microwave H-field on magnetic materials.

  34. Synthesis and photoluminescence properties of Mn4+-doped magnetoplumbite-related aluminate X-type Ca2Mg2Al28O46 and W-type CaMg2Al16O27 red phosphors 査読有り

    Takuya Sasaki, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    CERAMICS INTERNATIONAL 43 (9) 7147-7152 2017年6月

    出版者・発行元:ELSEVIER SCI LTD

    DOI: 10.1016/j.ceramint.2017.02.149  

    ISSN:0272-8842

    eISSN:1873-3956

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    Novel Mn4+-doped magnetoplumbite-related aluminate X-type Ca2Mg2Al28O46 and W-type CaMg2Al16O27 red phosphors were synthesized by solid-state reaction, and we investigated their photoluminescence properties. X-type Ca2Mg2Al28O46:Mn4+ and W-type CaMg2Al16O27:Mn4+ exhibited red photoluminescence, with peaks at 655 and 656 nm, arising from the spin-forbidden E-2 -&gt;(4)A(2) transition of Mn4+ under near-ultraviolet and blue light excitation, respectively. Therefore, these red phosphors can be excited by near ultraviolet or blue LED light. The photoluminescence properties of these phosphors were similar because magnetoplumbite-related structures crystallize similarly, forming structures consisting of stacked S and R blocks. From these results, we confirmed that magnetoplumbite-related compounds can act as the host structure for Mn(4+-)doped phosphors.

  35. Synthesis of Ti4O7 Nanoparticles by Carbothermal Reduction Using Microwave Rapid Heating 査読有り

    Tomohiro Takeuchi, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    CATALYSTS 7 (2) 65-73 2017年2月

    出版者・発行元:MDPI AG

    DOI: 10.3390/catal7020065  

    ISSN:2073-4344

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    The polymer electrolyte fuel cell (PEFC) is an attractive power generation method from the perspective of environmental protection. Carbon is usually used as a catalyst support in PEFC, but it is oxidized under high electrical potential conditions. Ti4O7 is expected as a new catalyst support because of its high electrical conductivity and chemical resistivity. Though Ti4O7 as a catalyst support must have a high specific surface area for a high performance, it is difficult to synthesize nanostructured Ti4O7. In this research, Ti4O7 nanoparticles with a size of about 60 nm were synthesized by carbothermal reduction of TiO2 nanoparticles with polyvinylpyrrolidone (carbon source) using 2.45 GHz microwave irradiation. The experiment condition was at 950 degrees C for 30 min and the samples synthesized by conventional heating showed a grain growth. The findings of this study suggest that microwave processing can drastically reduce the total processing time for the synthesis of nanostructured Ti4O7.

  36. Oriented texture formation of crystallized Nd2Fe14B through a microwave heating process 査読有り

    Y. Iwabuchi, J. Fukushima, N. Sakuma, M. Ito, Y. Shimo, H. Kishimoto, H. Takizawa

    JOURNAL OF ALLOYS AND COMPOUNDS 685 (685) 566-570 2016年11月

    出版者・発行元:ELSEVIER SCIENCE SA

    DOI: 10.1016/j.jallcom.2016.05.187  

    ISSN:0925-8388

    eISSN:1873-4669

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    The microstructure and magnetic properties of Nd2Fe14B crystallized by microwave heating were investigated to reveal the effect of microwave on the microstructure. The c-axis oriented and nano-sized columnar grains of Nd2Fe14B were obtained through microwave processing. The oriented texture was limited to the surface region. This microstructure could not be observed through conventional heating. It was considered that the temperature gradient caused by microwave heating was responsible for the formation of columnar grains. In addition to the change in the microstructure resulting from the heating methods, the coercivity and remanence of the microwave irradiated sample was larger than those obtained via conventional heating. (C) 2016 Elsevier B.V. All rights reserved.

  37. Low-Temperature Synthesis of Aluminum Nitride from Transition Alumina by Microwave Processing 査読有り

    Hideaki Chikami, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY 99 (11) 3540-3545 2016年11月

    出版者・発行元:WILEY-BLACKWELL

    DOI: 10.1111/jace.14367  

    ISSN:0002-7820

    eISSN:1551-2916

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    Aluminum nitride (AlN) was synthesized by carbothermal reduction and nitridation method from a mixture of various transition alumina powders and carbon black using 2.45 GHz microwave irradiation in N-2 atmosphere. We achieved the synthesis of AlN at 1300-1400 degrees C using 2.45 GHz microwave irradiation for 60 min. Our results suggest that -Al2O3 is more easily nitrided than -, -, and -Al2O3. On the other hand, nitridation ratio of samples synthesized in a conventional furnace under nitrogen atmosphere were zero or very low. These results show that 2.45 GHz microwave irradiation enhanced the reduction and nitridation reaction of alumina.

  38. Basic Physics on Reduction Reaction of Ferromagnetic Oxides under Microwave Irradiation

    J. Fukushima, S. Takayama

    Annual report of national institute for fusion science 419-419 2016年10月

  39. Construction of the Synthesis of Reduced Transition Metal Oxides - CO<SUB>2</SUB> Decomposition Cycle by Microwave Irradiation

    J. Fukushima, M. Tanaka

    Annual report of national institute for fusion science 420-420 2016年10月

  40. Enhanced reduction of copper oxides via internal heating, selective heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation 査読有り

    Jun Fukushima, Hirotsugu Takizawa

    MATERIALS CHEMISTRY AND PHYSICS 172 47-53 2016年4月

    出版者・発行元:ELSEVIER SCIENCE SA

    DOI: 10.1016/j.matchemphys.2015.12.057  

    ISSN:0254-0584

    eISSN:1879-3312

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    The reduction behavior of copper (II) oxide (CuO) covered with boron nitride (BN) powder under microwave H-field irradiation was investigated to understand the mechanism of enhanced reduction of CuO in microwave processing. Internal heating using microwave irradiation resulted in a unidirectional diffusion of oxygen from inside the CuO pellet to its outside, and selective heating prevented the oxidization of the BN powder near the CuO pellet. A quantum chemical interpretation of this phenomenon revealed that the microwave H-field couples to the Fermi level electrons of CuO, and the copper-oxygen bond may be cleaved by both microwave energy and thermal energy. As a result, microwave H-field irradiation resulted in a more effective reduction of CuO to copper metal compared to conventional heating. (C) 2015 Elsevier B.V. All rights reserved.

  41. General features of MW interaction with materials 査読有り

    S. Takayama, M. Sato, J. Fukushima

    Microwave Engineering of Materials: From Mesoscale to Nanoscale 31-72 2016年3月22日

    出版者・発行元:Pan Stanford Publishing Pte. Ltd.

    DOI: 10.4032/9789814669436  

  42. Control of Magnetic Properties of NiMn2O4 by a Microwave Magnetic Field under Air 査読有り

    Hiroshi Goto, Jun Fukushima, Hirotsugu Takizawa

    MATERIALS 9 (3) 169-178 2016年3月

    出版者・発行元:MDPI AG

    DOI: 10.3390/ma9030169  

    ISSN:1996-1944

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    NiMn prepared by conventional heating was irradiated with a microwave H-field using a single-mode cavity under air and magnetic properties of the microwave-irradiated material were investigated. X-ray diffraction and transmission electron microscopy demonstrated that the phase and microstructure are not affected by H-field irradiation. Measurements of the magnetization as a function of temperature revealed that the antiferromagnetic sublattice disappeared and electron spin resonance showed the existence of Mn 2+, suggesting that Mn3+ is partially reduced. Moreover, the magnetization of NiMn was controlled from 35.3 to 18.2 emu/g and the coercivity from 140 to 750 Oe by changing the sample temperature during microwave irradiation. The reduction reaction of NiMn is controlled by microwave H-field irradiation, resulting in control over the magnetic properties.

  43. P17 超音波反応場を用いた銀ナノワイヤー前駆体の合成と透明導電膜への応用

    藤田 恭輔, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 25 65-66 2016年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.25.0_65  

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    Silver Nanowires, Silver Carboxylates, Transparent Conductive Films, Low-Dimension MaterialsAbstract: Silver nanowires transparent conductive films are expected as a material to replace indium tin oxidefilms. Silver nanowires are mainly synthesized by the polyol method, which used protective agents to achievean anisotropic crystal growth. However, protective agents decrease conductivity of the films because theycover the surface of nanowires. In this study, we have conveniently synthesized needle-shaped silvercarboxylates by ultrasound irradiation, and then obtained silver nanowires transparent conductive films byspray coating them on substrates and exposing them to gas-phase hydrazine.<br>Silver carboxylates were synthesized by ultrasound irradiation to mixture that contains silver(I) oxide, aceticacid, propionic acid, and ethanol. These carboxylates were put onto a glass substrate, and then reduced byexposure to hydrazine gas (vaporized hydrazine monohydrate). The obtained samples were characterized byFE-SEM, XRD, TG-DTA, four-probe method, and UV-Vis.<br>Silver oxide completely reacted and silver carboxylates were produced after 1 h of ultrasound irradiation(22.32-44.13 kHz, 100 W). Raw materials were most homogeneity dispersed and consumed at 44.13 kHz. Thestudy on coating conditions of the precursor, in case of short height of the spray, produced transparentconductive films showed low transmittance and very low resistance. And high transmittance and lowresistance were achieved by adjusting the coating time and spray height.

  44. Photoluminescence properties of the magnetoplumbite-type BaMg6Ti6O19:Mn4+ and spinel-type Mg2TiO4:Mn4+ 査読有り

    Takuya Sasaki, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    Materials Science Forum 868 73-78 2016年

    出版者・発行元:Trans Tech Publications Ltd

    DOI: 10.4028/www.scientific.net/MSF.868.73  

    ISSN:0255-5476

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    Mn4+-doped magnetoplumbite-type BaMg6Ti6O19 and spinel-type Mg2TiO4 red phosphors were synthesized by a solid-state reaction. BaMg6Ti6O19:Mn4+ and Mg2TiO4:Mn4+ were formed as main and single phase above 1200 ºC, respectively. Although the emission peak of BaMg6Ti6O19:Mn4+ and Mg2TiO4:Mn4+ were almost the same, the excitation peak of BaMg6Ti6O19:Mn4+ and Mg2TiO4:Mn4+ were different. The4A2→4T1 spin-allowed transition peak of Mg2TiO4:Mn4+ shifted to a shorter wavelength side than that of BaMg6Ti6O19:Mn4+ and 4A2→4T2 transition shifted to a longer wavelength side. The crystal field splitting energy of Mg2TiO4:Mn4+ was lower than that of BaMg6Ti6O19:Mn4+. By the additional of R block, the racah parameter B increased and C decreased. Although the increase of B causes a blue-shift of the emission wavelength and the decrease of C causes a red-shift of the emission wavelength, PL emission wavelength was little different due to the influence of both racah parameter. Thus, it was suggested that the existence of R block results in a difference of photoluminescence properties.

  45. Synthesis and photoluminescence properties of SrLaAlO4: Ti green-emitting phosphor 査読有り

    Naoto Watanabe, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    Materials Science Forum 868 1-5 2016年

    出版者・発行元:Trans Tech Publications Ltd

    DOI: 10.4028/www.scientific.net/MSF.868.1  

    ISSN:0255-5476

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    Ti-doped SrLaAlO4 green-emitting phosphor was synthesized via solid-state reactions in air and N2 atmosphere. Sample heated in air showed no emission, however, sample heated in N2 showed broad green emission around 492 nm and broad near-infrared emission around 950 nm by 321 nm near-ultraviolet excitation. XPS measurement and UV-Vis diffuse reflectance spectra suggest that Ti in the sample was reduced to Ti3+ state when the sample was heated in N2. Possible emission mechanism of the sample can be explained as O2-–Ti3+ charge-transfer transition.

  46. Synthesis of homologous compounds Fe2O3(ZnO)(m) (m=6, 8, 34) by various selective microwave heating conditions 査読有り

    Daisuke Nagao, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    CERAMICS INTERNATIONAL 41 (10) 14021-14028 2015年12月

    出版者・発行元:ELSEVIER SCI LTD

    DOI: 10.1016/j.ceramint.2015.07.015  

    ISSN:0272-8842

    eISSN:1873-3956

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    Homologous compounds, Fe2O3(ZnO)(m) with a modulated natural superlattice structure, were synthesized within 10 min at 1200 degrees C in a simple solid-state reaction under 2.45 and 28 GHz microwave irradiation. Transmission electron microscopy and energy dispersive X-ray spectroscopy results revealed that m decreased with increasing the synthesis temperature and microwave frequency. In the Zn-Fe-O system, gamma-Fe2O3 was heated in H and E-field and ZnO was heated in E-field under 2.45 GHz microwave irradiation. However, alpha, gamma-Fe2O3 and calcined ZnO were heated under 28 GHz microwave irradiation. This selective microwave heating resulted in the different diffusion conditions than conventional heating; therefore, homologous compounds with low m values were rapidly synthesized at low temperature. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

  47. Reduction Reaction of Ferromagnetic Oxides under Microwave Irradiation

    J. Fukushima, H. Goto, S. Takayama

    Annual report of national institute for fusion science 427-427 2015年11月

  48. Influence of Microwave Irradiation on Magnetic Oxide Compact 査読有り

    Sadatsugu Takayama, Masayasu Takeda, Jun Fukushima, Motoyasu Sato

    Proceedings of the 2nd International Symposium on Science at J-PARC — Unlocking the Mysteries of Life, Matter and the Universe — 2015年9月25日

    DOI: 10.7566/JPSCP.8.031003  

  49. Facile synthesis of silver-nanobeadwire transparent conductive film by organic-precursor paint reduction 査読有り

    Kenta Sugawara, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    CRYSTAL RESEARCH AND TECHNOLOGY 50 (4) 319-330 2015年4月

    出版者・発行元:WILEY-V C H VERLAG GMBH

    DOI: 10.1002/crat.201400473  

    ISSN:0232-1300

    eISSN:1521-4079

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    A new facile process has been developed to synthesize silver nanowire transparent conductive films by reducing high-aspect-ratio, needle-shaped silver carboxylates, prepared as the precursor, while retaining their morphology. Nanowire precursors are simply obtained by ultrasound irradiation when silver (I) oxide and carboxylic acids are used as starting materials. The aspect ratio of the precursors is increased when the ultrasound irradiation is followed by microwave irradiation. Silver nanowires can be easily obtained by reducing these precursors with hydrazine gas or irradiating them with Ar plasma for a short time. The morphology of the resulting nanowires is different from that of typical nanowires that have been reported. The nanowires have porous morphology, where small nanoparticles are connected to form nanobeadwire. The nanobeadwire is considered to increase the transparency of the film because of its rough morphology. This new method can synthesize silver nanobeadwires and fabricate the transparent conductive film simultaneously, in one-step, so that it can significantly simplify manufacturing processes.

  50. P03 超音波による銀ナノ粒子の酸化処理銅ナノ粒子表面への担持(ポスターセッション)

    佐々木 遼, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 24 25-26 2015年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.24.0_25  

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    Copper nanoparticles(CuNPs) are expected to be novel wiring materials because of low sintering temperature and low-priced ingredients. CuNPs are usable as a ink for wiring. This ink printed on a circuit board conducts electricity after proper heat treatment. However, CuNPs oxidize easily in the air. To prevent oxidation of CuNPs, additional costly process are needed such as atmosphere exchanging into an inert atmosphere. On the other hand, organic compounds have been used as protectors for CuNPs, but these non-metallic coverings often reduce conductivity of CuNPs. Hence, Cu-Ag nanocomposites(Cu-Ag NC) have been considered as an alternative method to prevent oxidation. In this study, Cu-Ag NC were easily synthesized under high concentration condition by using ultrasonic irradiation. Ultrasonic irradiation was easily process to combine metal nanoparticles with other materials. However, CuNPs and silver nanoparticles repel each other in a solvent because of positively charged particles. To change charge of CuNPs, oxidization of CuNPs is available. CuNPs were purposely oxidized, then synthesis of Cu-Ag NC became easily. Cu-Ag NC were reduced on a glass substlate, and electric resistivity of the sample were decreased from 2.267 Ωcm to 1.690 × 10^<-4> Ωcm.

  51. P12 Cr(CO)_6の超音波分解によるCrナノ粒子の合成(ポスターセッション)

    小出 真路, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 24 43-44 2015年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.24.0_43  

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    Hard chromium plating has been used to improve hardness, resistance to corrosion, friction and heat in various fields. However, alternative technology of hard chromium plating is desired because of toxicity of raw materials. Thus, we developed a novel method to fabricate a hard film by using Cr nanoparticles. Although this method is easy and environmentally friendly, Cr nanoparticles are expensive at present because Cr nanoparticles are synthesized by vapor deposition. In this study, we tried to synthesize Cr nanoparticles in solvent by ultrasonic decomposition of Cr(CO)_6. Cr(CO)_6 was fully decomposed by ultrasonic irradiation in decanol at 50 ℃ for 30 min. The product had a low crystallinity and particles sizes were about 5 nm. In TG-DTA, products exhibited weight loss (33 %) around 1000 ℃ in Ar by decomposition of organics. In XRD, Cr and Cr_2O_3 were observed after heating at 1000 ℃ in Ar. It is considered that surfaces of Cr nanoparticles were formed oxide shells of Cr_2O_3 as passive layers. When the atmosphere was changed from Ar to air in 1000 ℃, products exhibited weight gain due to oxidation of Cr.

  52. Synthesis and characterization of Ag/Graphene nanocomposites by solid-liquid sonochemical reactions 査読有り

    Tomofumi Mochizuki, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    Materials Science Forum 804 119-122 2015年

    出版者・発行元:Trans Tech Publications Ltd

    DOI: 10.4028/www.scientific.net/MSF.804.119  

    ISSN:0255-5476

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    In this study, Graphite Oxide (GO) and Ag/Graphene nanocomposites were synthesized by solid-liquid sonochemical reactions easily and briefly. GO was synthesized by means of Hummers method using sonication or stirring. From XRD patterns and FT-IR spectra, chemical and physical effects of ultrasound promoted the oxidation of Graphite. Ag/graphene nanocomposites were synthesized from GO and silver oxide by sonication. UV-vis spectra showed the peaks of Graphene oxide and Ag nanoparticle plasmon resonance absorption. EDX images and electron diffraction patterns confirmed Ag nanoparticles were decorated on Graphene sheets by ultrasound. Using sonication, GO and Ag/Graphene nanocomposites could be synthesized easily in short time.

  53. Protective agent free eco-synthesis of silver nanowire via needle-shaped silver acetate precursor 査読有り

    Kenta Sugawara, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    Materials Science Forum 804 115-118 2015年

    出版者・発行元:Trans Tech Publications Ltd

    DOI: 10.4028/www.scientific.net/MSF.804.115  

    ISSN:0255-5476

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    We developed new synthetic method of silver nanowire by reducing silver acetate precursor. Silver acetate could be easily synthesized by ultrasound irradiation to the mixture of non-toxic starting materials, only ethanol and silver(I) oxide. All of reaction was performed in relatively low temperature and it does not need any protective agents. The precursors had high aspect ratio needle-shaped morphology. They decomposed easily by heating up to 300 °C and then produce only silver without any residues. This process is expected to be new synthetic method of silver nanowire that doesn’t require any protective agents and emit much waste.

  54. SYNTHESIS OF COPPER SPINELS BY MICROWAVE IRRADIATION 査読有り

    Jun Fukushima, Hirotsugu Takizawa, Yamato Hayashi

    PROCESSING AND PROPERTIES OF ADVANCED CERAMICS AND COMPOSITES VII 252 33-41 2015年

    出版者・発行元:JOHN WILEY & SONS INC

    ISSN:1042-1122

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    CuFe2O4 was synthesized by microwave irradiation and conventional processing. In addition, microwave H-field annealing was conducted in order to investigate the effect of a magnetic field on tetragonal CuFe2O4. The sample synthesized with microwave E-field irradiation was cubic CuFe2O4, had a small saturation magnetization, and the same coercivity as that produced by conventional heating. In contrast, the sample synthesized with H-field irradiation had a larger saturation magnetization and a smaller coercivity than the sample synthesized by conventional heating. After H-field annealing, the sample had a large amount of cubic CuFe2O4 phase that consists of small crystallites. Moreover, the saturation magnetization increased and the coercivity decreased. These results suggest that microwaves lead to a reduction in the Jahn-Teller distortion and the magnetic property changes accordingly. It is concluded that microwaves affect the Jahn-Teller distortion of CuFe2O4 and the effect leads to changes in the phase and magnetic properties.

  55. An Application of Landau Dumping to Chemical Reactions and Phase Transitions in Dense Matters under Intense Microwave Irradiations

    M. Sato, J. Fukushima, S. Takayama

    Annual Report Apr.2013 - Mar.2014 475-475 2014年11月

  56. Structure and Magnetic Property of FeAl&lt;inf&gt;2&lt;/inf&gt;O&lt;inf&gt;4&lt;/inf&gt; Synthesized by Microwave Heating 査読有り

    Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    Processing and Properties of Advanced Ceramics and Composites VI: Ceramic Transactions 249 293-301 2014年9月15日

    出版者・発行元:Wiley Blackwell

    DOI: 10.1002/9781118995433.ch28  

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    Most of microwave energy transforms into thermal energy, and chemical reactions are driven by thermal energy. In the past decade, however, many studies have been reported about "microwave effect", which is difficult to explain by thermodynamics, e.g., decrystallization of the ferromagnetic materials, creating the supersaturated solid solutions, etc. In particular, it is noteworthy of the antiferromagnetic-ferromagnetic transition of a spinel ferrite. Although it is known that the microwave magnetic field (H-field) plays an important role in this process, the details are still not clear. In previous work, FeAl&lt inf&gt 2&lt /inf&gt O&lt inf&gt 4&lt /inf&gt , which is a typical antiferromagnetic spinel, was synthesized using single-mode 2.45 GHz microwave H-field irradiation and the effect of the magnetic fields on magnetic characteristics of antiferromagnetic oxide was studied. However, the authors do not reach to reveal a basic mechanism of decreasing the crystal diameter (increasing the grain boundaries) by microwave irradiation. In the study, to examine the effect of the ratio of y-Fe&lt inf&gt 2&lt /inf&gt O&lt inf&gt 3&lt /inf&gt in starting materials for the change of magnetic properties by microwave H-field irradiation, FeAl&lt inf&gt 2&lt /inf&gt O&lt inf&gt 4&lt /inf&gt is synthesized from 90 wt% Fe&lt inf&gt 2&lt /inf&gt O&lt inf&gt 3&lt /inf&gt -10 wt% Al&lt inf&gt 2&lt /inf&gt O&lt inf&gt 3&lt /inf&gt mixed powder.

  57. Synthesis of Divalent Sn Compounds Under Microwave Non-Equilibrium Reaction Field 査読有り

    Hirotsugu Takizawa, Nozomi Sato, Jun Fukushima, Yamato Hayashi

    Processing and Properties of Advanced Ceramics and Composites VI: Ceramic Transactions 249 321-328 2014年9月15日

    出版者・発行元:Wiley Blackwell

    DOI: 10.1002/9781118995433.ch31  

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    Chemical reaction between two or more components under microwave electromagnetic field is essentially "non-equilibrium reaction" because microwave absorbing behavior strongly depends on a nature of a material. Selective heating of a specific component plays a key role on the formation of non-equilibrium structure. The existence of stereoactive lone pair (5s&lt sup&gt 2&lt /sup&gt ) is an issue of concern of Sn&lt sup&gt 2+&lt /sup&gt compounds in a view point of ferroelectricity, however, it is difficult to synthesize Sn&lt sup&gt 2+&lt /sup&gt compounds because SnO tends to decompose to metallic Sn and Sn&lt sup&gt 4+&lt /sup&gt O&lt inf&gt 2&lt /inf&gt at elevated temperature. Binary SnO-TiO&lt inf&gt 2&lt /inf&gt system is a typical selective heating system under microwave irradiation because SnO strongly absorbs microwaves, but TiO&lt inf&gt 2&lt /inf&gt is nearly transparent to microwaves. During microwave irradiation to the powder mixture of SnO and TiO&lt inf&gt 2&lt /inf&gt , a drastic enhancement of reaction kinetics could be achieved under thermally non-equilibrium condition. This makes it possible to synthesize a non-equilibrium Sn&lt sup&gt 2+&lt /sup&gt compound, Sn&lt inf&gt 2&lt /inf&gt TiO&lt inf&gt 4&lt /inf&gt , avoiding the disproportionation reaction of SnO. Optimal synthetic condition to obtain a single-phase Sn&lt sup&gt 2&lt /sup&gt TiO&lt inf&gt 4&lt /inf&gt and the comparison with the other external rapid heating system was studied.

  58. An Explanation of Microwave Effects by Expansion of Transit State Theories with Disturbed Velocity Distributions by Microwave 査読有り

    Motoyasu Sato, Jun Fukushima, Sadatsugu Takayama

    Processing and Properties of Advanced Ceramics and Composites VI: Ceramic Transactions 249 313-320 2014年9月15日

    出版者・発行元:Wiley Blackwell

    DOI: 10.1002/9781118995433.ch30  

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    The microwave effects are examined experimentally and explained by expanding the Erying's transition state theories. Microwave couples with electro-kinetic waves in a material. The wave accumulates kinetic energy to the particles oscillating near the phase velocity via the Landau damping in a velocity space. It disturbs Boltzmann velocity distribution function. The pre-exponential factors are explained introducing the disturbed velocity distribution function to the Eyring transition state theories. It leads the enhancement of chemical reactions. If the microwave has monochromatic frequency, it can accumulate energy in phase space and make large disturbances in the velocity space. If it has frequency spread (δω), the phases of the excited waves interact each other and relax the kinetic energies to the thermal motions via the phase mixing before it disturbs the velocity function. Experimental results suggest that the microwave effect appeared or disappeared depending on the quality factor (ω/2δω) of microwave wave.

  59. Microwave Blast Furnace and Its Refractories 査読有り

    K. Nagata, M. Sato, K. Hara, T. Hotta, Y. Kitamura, M. Hayashi, K. Kashimura, T. Mitani, J. Fukushima

    Journal of the Technical Association of Refractories, Japan 34 (2) 66-73 2014年8月8日

  60. Synthesis and Photoluminescence Properties of Mn4+-doped BaMg6Ti6O19 Phosphor 査読有り

    Talcuya Sasaki, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    CHEMISTRY LETTERS 43 (7) 1061-1063 2014年7月

    出版者・発行元:CHEMICAL SOC JAPAN

    DOI: 10.1246/cl.140282  

    ISSN:0366-7022

    eISSN:1348-0715

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    A Mn4+-doped BaMg6Ti6O19 red phosphor was synthesized by a solid-state reaction. This phosphor showed red emission with a peak at 660 nm because of the E-2 -&gt; (4)A(2) transition of Mn4+ upon excitation in the region from near ultraviolet to blue. The specimen doped with 0.1% Mn and synthesized at 1250 degrees C exhibited the maximum emission intensity. BaMg6Ti6O19:Mn4+ is a novel red phosphor of titanate, which is the host material.

  61. P13 超音波反応場を用いた低沸点溶媒中でのグラファイトの直接剥離(ポスターセッション)

    望月 智文, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 23 55-56 2014年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.23.0_55  

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    Recently, graphene has attracted tremendous research interests due to its unique mechanical, electrical and thermal properties caused by a two-dimensional, single-atom-thick structure of sp2-bonded carbon atoms. In the past few years, several methods, such as chemical vapor deposition and exfoliation of graphite powder in high boiling point solvents, have been used to prepare graphene sheets. It is known that chemical reactions, stirring, dispersion and exfoliation are promoted by ultrasound-cavitation. In this study, the production of unfunctionalized and nonoxidized graphene by exfoliation of graphite flakes in solvents is synthesized and characterized. We used 2-propanol (IPA) and acetic acid as low boiling point solvents. A stable homogeneous dispersion of graphene was obtained by solid-liquid sonochemical reactions using IPA and acetic acid mixed solvents. STEM images and electron diffraction pattern shows the presence of mono- and few-layer graphenes. As a result, graphene could be synthesized in low boiling point solvent. The solvent, IPA, was simply and quickly removed by air-drying, and dose not leave any residue of the solvent in the graphene sheets.

  62. P14 超音波による銀ナノワイヤー前駆体の作製と透明導電膜への応用(ポスターセッション)

    菅原 賢太, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 23 57-58 2014年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.23.0_57  

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    Silver nanowire transparent conducting films (TCFs) are expected to be alternative materials for indium tin oxide TCFs. Silver nanowires are typically synthesized by polyol method. It requires protective agents to achieve an anisotropic crystal growth, however, protective agents cover the top surface of nanowires, and hence decrease conductivity of films. In this study, we have conveniently synthesized needle-shaped silver carboxylates by ultrasound irradiation, and then obtained silver nanowires transparent conductive films by spraying them on substrate and exposing them to gas-phase hydrazine. Silver carboxylates were synthesized by ultrasound irradiation to mixture that contains silver(I) oxide, acetic acid, propionic acid, and ethanol. These carboxylates were put onto glass or polycarbonate (PC) substrate, and then exposed to hydrazine gas (vaporized hydrazine monohydrate) to reduce. The obtained samples were characterized by FE-SEM, XRD, TG-DTA, four-point probe and UV-Vis. Silver oxide was completely reacted and silver carboxylates were produced after 1 h of ultrasound irradiation at 10-40 ℃, that is relatively low temperature compared to conventional method. Decreasing reaction temperature, it was confirmed that diameters of the precursor were reduced by 25%. Diameter and aspect ratio of the precursor were decreased for longer reaction time because of sonofragmentation. To reduce diameter with keeping aspect ratio, lower temperature can be effective. Transparent conductive films, which were produced by spraying and reducing precursor, show high transmittance and low resistance at 80 ℃ of reduction temperature. However resistivity have been drastically increased for higher temperature because their specific one-dimensional shapes have been completely lost.

  63. P27 超音波を利用した耐酸化性Cu-Agナノコンポジットの合成(ポスターセッション)

    佐々木 遼, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 23 83-84 2014年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.23.0_83  

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    Printed electronics is one of the inexpensive fabrication for electronic circuits and it is expected to be an alternative to conventional method such as photolithography. Commercial conductive ink for printed electronics often uses Ag nanoparticles(AgNPs), but AgNPs are expensive. Accordingly, Cu nanoparticles(CuNPs) are expected to replace for AgNPs, because Copper is much cheaper than silver and has high conductivity. However, Copper oxidises easily in the atmosphere. To prevent oxidation of Cu, organic compounds have been used as coverings for CuNPs, but these non-metallic coverings often reduce conductivity of CuNPs. Hence, Cu-Ag nanocomposites(Cu-Ag NC) have been considered as an alternative method to prevent Cu oxidation. In this study, Cu-Ag NC were easily synthesized under high concentration condition with microwaves and ultrasonication. Microwave heating is effective method for synthesis of nanoparticles because of its effect to heat polar solvents quickly and uniformly. Ultrasonication is easily process to synthesize composites of nanoparticles and other materials. The sample synthesized showed the form that AgNPs attached to the surface of CuNPs in its SEM images. Thermogravimetry measurement suggested that the sample has high oxidation resistance against CuNPs.

  64. Synthesis of Noble Metal-Doped Cu Nanoparticles by Ultrasonication 査読有り

    Hiroaki Koubu, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa, Ichihito Narita, Satoru Yoshioka

    MATERIALS TRANSACTIONS 54 (8) 1496-1501 2013年8月

    出版者・発行元:JAPAN INST METALS

    DOI: 10.2320/matertrans.M2013077  

    ISSN:1345-9678

    eISSN:1347-5320

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    Cu nanoparticles doped with small amounts of noble metals were synthesized by ultrasonication. The noble metals selected were Pd, Pt, Ru, Rh and Ir. Mean particle size was most reduced for Cu nanoparticles doped with Pd, with Cu-Pd nanoparticles of approximately 50 urn in diameter being obtained. X-ray absorption, near-edge spectroscopy and extended X-ray absorption were used to conduct fine structure analysis, and these techniques confirmed that Cu-Pd nanoparticles possessed Cu-Pd bonds. High-angle annular dark-field scanning transmission electron microscopy and energy dispersive X-ray spectrometer mapping were used to show that Cu-Pd nanoparticles were dispersed as Pd clusters inside Cu nanoparticles. It was supposed that the surfaces of Cu-Pd nanoparticles were Cu-rich, and Pd clusters were dispersed inside these particles. It is proposed that heterogeneous nucleation of Cu onto Pd nuclei resulted when nucleation of Pd occurred.

  65. Metal Ti-Cr alloy powders nitriding under atmospheric pressure by microwave heating 査読有り

    Keiichiro Kashimura, Jun Fukushima, Tomohiko Mitani, Motoyasu Sato, Naoki Shinohara

    Journal of Alloys and Compounds 550 (550) 239-244 2013年2月15日

    DOI: 10.1016/j.jallcom.2012.09.117  

    ISSN:0925-8388

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    In the presence of microwave radiation, nitridation of metallic titanium in air becomes possible instead of the thermodynamically favorable oxidation. In this study, β-Ti-Cr alloy powders were synthesized to these nitrides by microwaves, using the fact that a solid solution of β-Ti-Cr is similar to pure β-Ti in terms of the electronic structure. The alloy powders were heated to a temperature of 1000 °C or higher by microwaves at a high oxygen partial pressure (PO2=2 × 10-1atm), and were analyzed by both wavelength-dispersive X-ray spectroscopy and X-ray diffraction. Nitridation was achieved for the β-Ti-Cr alloy, but not for a Ti-Fe alloy. The results can be explained using the average energy of electrons in 3d orbitals. Furthermore, multilayer structures made of nitrides and oxides were observed. The powders had a temperature-space distribution in the microwave field and the multi-layer structures corresponded to this distribution. © 2012 Elsevier B.V. All rights reserved.

  66. マイクロ波と超音波を用いた金属ナノ粒子の固液系エコプロセッシング 査読有り

    林 大和, 井上雅博, 森 貴洋, 福島潤, 滝澤博胤

    Proc. Mate2013 19 75-78 2013年1月29日

  67. In-situ kinetic study on non-thermal reduction reaction of CuO during microwave heating 査読有り

    Jun Fukushima, Keiichiro Kashimura, Sadatsugu Takayama, Motoyasu Sato, Saburo Sano, Yamato Hayashi, Hirotsugu Takizawa

    Materials Letters 91 252-254 2013年1月15日

    DOI: 10.1016/j.matlet.2012.09.114  

    ISSN:0167-577X

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    Reduction kinetics of CuO during microwave heating and conventional heating (electric furnace) were investigated to verify a process of direct transforming microwave energy into energy of reduction reaction. In the experiment, reduction speed during microwave heating or conventional heating was analyzed from an amount of emitted oxygen from a sample. An activation energy in each heating was obtained from an Arrhenius plot of the results. The activation energy in microwave heating at the maximum point of E-field (E-field heating) was decreased to 2/3 that in conventional one and the activation energy in microwave heating at the maximum point of H-field (H-field heating) was also decreased to 1/3 compared to that in conventional one. As the sample was reduced to Cu2O, microwave energy is transformed directly into reduction energy because the enthalpy of the reduction reaction is larger than activation energies in E-field and H-field heating. © 2012 Elsevier B.V. All rights reserved.

  68. P27 超音波照射による銀ナノワイヤー前駆体の合成(ポスターセッション)

    菅原 賢太, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 22 75-76 2013年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.22.0_75  

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    Silver nanowire transparent conducting films (TCFs) are expected to be alternative materials for indium tin oxide TCFs. Silver nanowires are typically synthesized by polyol method. It requires protective agents in order to achieve an anisotropic crystal growth, however, protective agents cover the surface of nanowires, and hence decrease conductivity of electrodes. In this study, we have synthesized needle-shaped silver carboxylates by ultrasound irradiation without any protective agent, and then obtained silver nanowires by exposing them to hydrazine gas. Silver carboxylates were synthesized by ultrasound irradiation to mixture that contains silver(I) oxide, carboxylic acids(2-6C), and ethanol. These carboxylates were put onto glass substrate, and then exposed to hydrazine gas (vaporized hydrazine monohydrate) to reduce. The obtained samples were characterized by FE-SEM, XRD, TG-DTA, and UV-Vis. Long needle-shaped silver carboxylates were observed after ultrasound irradiation. In contrast to stirrer, we obtained well-dispersed silver carboxylates by ultrasound irradiation. In addition, it was confirmed that the reaction rate is greater than that of stirrer. These results are due to effects of ultrasound, such as strong dispersive power, erosion, and high temperature-pressure reaction field. Silver nanowire TCF were prepared by reducing silver carboxylates. This film indicated low resistivity and high transparency.

  69. A13 固液系超音波・マイクロ波反応場を利用した白金ナノ粒子の合成と応用(口頭発表)

    林 大和, 福島 潤, 滝澤 博胤, 國井 勝之

    ソノケミストリー討論会講演論文集 22 109-110 2013年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.22.0_109  

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    Ecology and Economy synthesis is important in the future. There are some elements to achieve this synthesis. One is a production device. A cheap device is hoped for in not an expensive, special device but the general purpose. The second is a raw material. When synthesizing, neither waste nor the air pollutant are not generated, and it is safe and nontoxic raw material is preferable. The third is a synthetic temperature. Low temperature synthesis as much as possible is suitable from the viewpoint of energy conservation. Sustainable processing for Platinum nanoparticles were developed by novel ultrasonic and microwave liquid-solid reaction. We used Platinum oxide as metallic source and water based solvent in this system. This system can be synthesized 2-3nm Platinum nanoparticle in short time and non-waste, so low-pricing of Platinum nanoparticle is realizable. By using water-ethanol mixed solvent, it can obtain dispersant-free Platinum nanoparticles suitable for catalyst, etc. In this study, fabricated conditions were examined in detail, reaction mechanisms and morphology of products were investigated.

  70. P28 固-液系超音波反応場を用いたAg/グラフェンナノコンポジットの合成と評価(ポスターセッション)

    望月 智文, 林 大和, 福島 潤, 滝澤 博胤

    ソノケミストリー討論会講演論文集 22 77-78 2013年

    出版者・発行元:日本ソノケミストリー学会

    DOI: 10.20577/pamjss.22.0_77  

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    Recently, graphene has attracted tremendous research interest due to its unique mechanical, electrical and thermal properties caused by a two-dimensional, single-atom-thick structure of sp^2-bonded carbon atoms. In the past few years, several methods, such as chemical vapor deposition and chemical reduction of graphene oxide, have been used to prepare graphene sheets. It is known that chemical reactions, stirring, dispersion and exfoliation are promoted by ultrasound-cavitation. In this work, Graphite Oxide (GO) and Ag/graphene nanocomposites were synthesized by solid-liquid sonochemical reactions easily and briefly. GO was synthesized by means of Hummers method using sonication or stirring. From XRD patterns and FT-IR spectra, the oxidation of graphite was promoted by chemical and physical effects of ultrasound. Ag/graphene nanocomposites were synthesized from GO and silver oxide by sonication. UV-vis spectra showed the peaks of graphene oxide and Ag nanoparticle plasmon resonance absorption. EDX images and electron diffraction patterns confirmed Ag nanoparticles were decorated on graphenesheets by ultrasound. Using sonication, GO and Ag/graphene nanocomposites could be synthesized easily in short time.

  71. Fabrication and thermoelectric properties of Al-doped (ZnO)5In2O3 by microwave heating 査読有り

    Tomoyuki Endo, Yamato Hayashi, Jun Fukushima, Hirotsugu Takizawa

    Materials Science Forum 761 27-31 2013年

    DOI: 10.4028/www.scientific.net/MSF.761.27  

    ISSN:0255-5476

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    Various (ZnO)5In2O3 ceramics were fabricated by microwave heating. Density, XRD pattern and microstructure were examined, and those of the Al-doped (ZnO)5In2O3 were almost the same as Al-free one. The highly textured (ZnO)5In2O3 ceramic was also fabricated by reactive templated grain growth (RTGG) method. The electrical conductivity was not improved by Al-doping however it was improved slightly by microwave heating compared with conventional heating and especially improved by texturing using RTGG method. On the other hand, the absolute Seebeck coefficient in microwave heating was improved about 25% by Al-doping. The maximum electric power factor of a textured specimen fabricated by RTGG method along the ab-plane showed 5.76×10-4 WK-2m-1 (at 873K), which was attributed to high electrical conductivity. © (2013) Trans Tech Publications, Switzerland.

  72. Eco-fabrication of Metal Nanoparticle Related Materials by Non-equilibrium Reaction Field 査読有り

    Yamato Hayashi, Yoshihiro Sekiguchi, Takahiro Yamada, Kou Takizawa, Hiroaki Koubu, Jun Fukushima, Hirotsugu Takizawa

    ECO-MATERIALS PROCESSING AND DESIGN XIV 761 87-+ 2013年

    出版者・発行元:TRANS TECH PUBLICATIONS LTD

    DOI: 10.4028/www.scientific.net/MSF.761.87  

    ISSN:0255-5476

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    Eco (Ecology & Economy)-fabrication is important in the future manufacturing. There are some elements to achieve this synthesis. When synthesizing, neither waste nor the air pollutant are not generated, and it is safe material is preferable with cheap fabrication device. We developed a new metal nanoparticle related materials synthesis method that achieved in these viewpoints. This new synthesis method is with microwave as non-equilibrium reactor and the metal oxide and alcohol-based solvent are used for the raw material. Moreover, the oxide and alcohol generally are cheap without toxicity. We synthesized metal nanoparticle related materials by microwave in liquid-solid (alcohol - metal oxide) slurry and controlled morphology of products. Microwave irradiation in liquid-solid process can be expected as chemical non-equilibrium and nonlinear reactors for metal nanoparticle related materials synthesis. The alcohol based solvent and the metal oxide powder are put in the beaker and only irradiated by ultrasound or microwave. The metal oxide simply was reduced into metal and morphology of metal nanoparticles was changed by various conditions. Various metal nanoparticle related materials were fabricated by microwave irradiation as non-equilibrium reaction field.

  73. Fabrication of (Zn1-xAlxO)5In 2O3 by microwave irradiation and thermoelectric characterization 査読有り

    Tomoyuki Endo, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    Journal of the Ceramic Society of Japan 121 (1413) 416-421 2013年

    出版者・発行元:Ceramic Society of Japan

    DOI: 10.2109/jcersj2.121.416  

    ISSN:1348-6535 1882-0743

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    The layer-structured thermoelectric material, Al-doped (ZnO) 5In2O3, was fabricated by microwave irradiation within a short time of 15min and its thermoelectric properties were examined. When comparing specimens sintered by microwave irradiation (15 min) with those by conventional heating (4h), their microstructure and composition were similar. However, electrical conductivity was improved by microwave irradiation. Moreover, in (Zn1-xAlxO)5In2O 3 (x = 0.016, 0.032), Al-doping contributed to an increase in both the electrical conductivity and the absolute value of Seebeck coefficient, which contributed fairly to the high dimensionless figure of merit, ZT. Larger ZT was achieved by improvement in electrical conductivity by microwave irradiation and increases in both the electrical conductivity and the absolute value of Seebeck coefficient by Al doping. (Zn0.984Al0.016O) 5In2O3 sintered by microwave irradiation had the highest ZT, which was 1.5 times higher than that of (ZnO)5In 2O3 sintered by conventional heating at 773 K. © 2013 The Ceramic Society of Japan. All rights reserved.

  74. Structure and magnetic properties of FeAl2O4 synthesized by microwave magnetic field irradiation 査読有り

    Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

    Journal of Asian Ceramic Societies 1 (1) 41-45 2013年

    出版者・発行元:Elsevier B.V.

    DOI: 10.1016/j.jascer.2013.02.001  

    ISSN:2187-0764

    詳細を見る 詳細を閉じる

    The structure and magnetic properties of FeAl2O4 synthesized by microwave magnetic field (H-field) irradiation were investigated to reveal the effect of the H-field on the crystal structure and the magnetic characteristics of an antiferromagnetic material. The role of the H-field was investigated using a single-mode cavity, which can spatially separate the maximum points of the alternating electric field (E-field) and H-field in the cavity. In H-field irradiation, the crystallite diameter decreased compared to that in conventional heating. In conventional heating, the crystallite diameter did not change with increasing quenching speed. Thus, it is suggested that a decrease in crystallite diameter occurs during H-field irradiation. Furthermore, magnetization after H-field irradiation was greater than that after conventional heating. It is considered that magnetic clusters appear when Fe3+ partially replaces Al3+ in the octahedral sites in the grain boundaries, which were formed as a result of decreasing crystallite diameter. © 2013 The Ceramic Society of Japan and the Korean Ceramic Society.

  75. マイクロ波高炉とその耐火物 査読有り

    永田和宏, 佐藤元泰, 原恭輔, 堀田太洋, 北村洋平, 林幸, 樫村京一郎, 三谷友彦, 福島潤

    耐火物 64 (9) 392-399 2012年9月1日

    出版者・発行元:耐火物技術協会

    ISSN:0039-8993

  76. Effect of H-field or E-field on sintering and decrystallization of titanium oxides during 2.45 GHz microwave heating 査読有り

    Jun Fukushima, Sadatsugu Takayama, Saburo Sano, Motoyasu Sato, Yamato Hayashi, Hirotsugu Takizawa

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 59 (9) 553-556 2012年9月

    DOI: 10.2497/jjspm.59.553  

    ISSN:0532-8799

    詳細を見る 詳細を閉じる

    The effect of an H-field or E-field on the sintering and decrystallization of titanium oxides during 2.45 GHz microwave heating was investigated. Titanium oxides (TiO2-x) were heated in a TE103 single-mode cavity, which was used to separate the maximum point of the H-field or E-field of the 2.45 GHz microwave radiation. Scanning electron microscopy (SEM) images taken after H-field heating showed that the sample was sintered well above 1400 °C. In the X-ray diffraction (XRD) patterns, the intensity of the diffraction peaks of TiO2 decreased with increasing heating temperature between 1200°C and 1400 °C. After heating at 1500°C, however, the TiO2 peak intensities increased and undefined peaks emerged. Decrystallization is the dominant reaction, driven by the nonthermal microwave effect, below 1400°C. As the effect of the thermal energy becomes larger than the nonthermal microwave effect above 1500°C, grain growth becomes the dominant reaction. During E-field heating, the surface structure changes to fiber-like and dot-like structures, while some areas are oxidized by plasma excited by the microwaves.

  77. 2.45 GHzマイクロ波磁場加熱によるマグネタイト(Fe<SUB>3</SUB>O<SUB>4</SUB>)の焼結挙動 査読有り

    高山 定次, 福島 潤, 佐野 三郎, 佐藤 元泰

    粉体および粉末冶金 59 (9) 549-552 2012年9月

    DOI: 10.2497/jjspm.59.549  

    ISSN:0532-8799

  78. Microwave-energy distribution for reduction and decrystallization of titanium oxides 査読有り

    Jun Fukushima, Keiichiro Kashimura, Sadatsugu Takayama, Motoyasu Sato

    Chemistry Letters 41 (1) 39-41 2012年

    DOI: 10.1246/cl.2012.39  

    ISSN:0366-7022

    eISSN:1348-0715

    詳細を見る 詳細を閉じる

    In this study, we examine the reduction behavior of TiO 2-x during microwave irradiation at the maximum point of the H field in a single-mode cavity (H-field irradiation). The reduction of TiO 2-x was greater and the decrease in the activation energy (Ea) for reduction was higher when microwave irradiation was used than when conventional heating was used. TiO 2-x was decrystallized and formed a nanodomain structure with a 510 nm particle size. From these results, we determined the amount of microwave energy distributed as activation, kinetic, and thermal energies. © 2012 The Chemical Society of Japan.

  79. Plasma model for energy transformation mechanism of non-thermal microwave effect 査読有り

    Jun Fukushima, Motoyasu Sato, Hiroaki Nakamura

    Plasma and Fusion Research 7 (2012) 1206012 2012年

    DOI: 10.1585/pfr.7.1206012  

    ISSN:1880-6821

    eISSN:1880-6821

    詳細を見る 詳細を閉じる

    Microwaves generate ordered motion in material structures. Microwaves can transfer energy while maintaining coherency this is the origin of the microwave effect. We suggest that the non-thermal energy path during microwave heating really exists and that a plasma model can explain the non-thermal enhanced-reduction in microwave heating © 2012 The Japan Society of Plasma Science and Nuclear Fusion Research.

  80. Thermodynamics on MW Processing with Non-Thermal Effects 招待有り 査読有り

    M. Sato, J. Fukushima, K. Kashimura, T. Mitani, K. Nagata, D. Agrawal

    Proc. of the 2nd Global Congress on Microwave Energy Applications 112-130 2012年

    詳細を見る 詳細を閉じる

    ISBN:978-0-9786222-1-3

  81. Effect of Amplitude Modulation of Microwave on Non-thermal Reduction of Copper Oxides 査読有り

    J. Fukushima, M. Sato, K. Kashimura, T. Mitani, Y. Hayashi, H. Takizawa

    Proc. of the 2nd Global Congress on Microwave Energy Applications 242-252 2012年

    詳細を見る 詳細を閉じる

    ISBN:978-0-9786222-1-3

  82. Sintering of soft magnetic material under microwave magnetic field 査読有り

    Sadatsugu Takayama, Jun Fukushima, Junichi Nishijo, Midori Saito, Saburo Sano, Motoyasu Sato

    Physics Research International 2012 2012年

    DOI: 10.1155/2012/165849  

    ISSN:1687-689X 1687-6903

    詳細を見る 詳細を閉じる

    We have developed a simple process for sintering of soft magnetization materials using microwave sintering. The saturated magnetization (Ms) of sintered magnetite was 85.6emu/g, which was as high as 95 of magnetite before heating (90.4emu/g). On the other hand, the averaged remanence (Mr) and coercivity (Hc) of the magnetite after heating were 0.17emu/g and 1.12Oe under measuring limit of SQUID, respectively. For the sintering process of soft magnetic materials, magnetic fields of microwave have been performed in nitrogen atmosphere. Therefore, a microwave single-mode system operating at a frequency of 2.45GHz and with a maximum power level of 1.5kW was used. We can sinter the good soft magnetic material in microwave magnetic field. The sample shrank to 82% theoretical density (TD) from 45%TD of green body. The sintered sample was observed the microstructure by TEM and the crystal size was estimated the approximate average size is 10nm. Copyright © 2012 Sadatsugu Takayama et al.

  83. Chemical bond cleavage induced by electron heating Gas emission behavior of titanium-metalloid compounds (titanium nitride and oxide) in a microwave field 査読有り

    Jun Fukushima, Keiichiro Kashimura, Motoyasu Sato

    Materials Chemistry and Physics 131 (1-2) 178-183 2011年12月15日

    DOI: 10.1016/j.matchemphys.2011.08.050  

    ISSN:0254-0584

    詳細を見る 詳細を閉じる

    Gas emissions from titanium-metalloid compounds (titanium nitride and oxide) have been investigated to understand the effects of a microwave field on chemical reactions. We employed a high vacuum system (PO2 =10 -6 Pa) to observe in situ reductions. For titanium oxides, H-field heating significantly differed from conventional one in terms of oxygen emissions. For titanium nitride, the emissions were also induced by microwave heating. These tendencies were observed at temperatures above 1000 °C. A quantum chemical interpretation is provided to explain the emissions of the gases, and the experimental data is in good agreement with results predicted using the electronic energy band structure. © 2011 Elsevier B.V. All rights reserved.

  84. Investigation of Magnetic Structure under Microwave Heating Using by Neutron Diffraction Measurements

    S. Takayama, J. Fukushima, M. Sato, M. Takeda

    Annual report of national institute for fusion science 415-415 2011年11月

  85. Temperature Change and Oxygen Emission Behavior of Copper Oxides during Modulated-Microwave Irradiation

    J. Fukushima, T. Mitani, M. Sato

    Annual report of national institute for fusion science 416-416 2011年11月

  86. Investigation of crystal structure formation of magnetite under microwave heating on H-field 査読有り

    S. Takayama, J. Fukushima, M. Sato, M. Saito, N. Nishi

    Proc. Ampere 2011 (e-proceedings) 230-233 2011年9月

  87. Reduction enhancement of Copper oxide during Microwave heating 査読有り

    J. Fukushima, K. Kashimura, S. Takayama, M. Sato

    Proc. Ampere 2011 219-222 2011年

  88. Oxygen partial pressure change with metal titanium powder nitriding under microwave heating 査読有り

    Keiichiro Kashimura, Jun Fukushima, Motoyasu Sato

    ISIJ International 51 (2) 181-185 2011年

    DOI: 10.2355/isijinternational.51.181  

    ISSN:0915-1559

    詳細を見る 詳細を閉じる

    Microwave heating was applied to metal titanium powders at high oxygen partial pressure (10-5 atm) and the partial pressure of exhaust-gas were measured using an oxygen sensor made of solid electrolyte. During the application of the heating, the pressure decreased to an order of 10 -10 atm and quickly increased to an order of 10-5 atm and then oxygen emission peaks were observed. Furthermore, the nitriding mechanism was discussed for Ti14O13 model in terms of quantum chemistry. The quantum-chemical simulation showed that Ti-O bonding of titanium oxide is anti-bonding and consists of 3d orbital. The orbital becomes steady state by removing an oxygen atom from the model. © 2011 ISIJ.

  89. Studies on reaction kinetics under coherent microwave irradiations 査読有り

    M. Sato, J. Fukushima, K. Kashimura, M. Tanaka

    Proceedings of SPIE - The International Society for Optical Engineering 8121 2011年

    DOI: 10.1117/12.893020  

    ISSN:0277-786X

    詳細を見る 詳細を閉じる

    The monochromatic and single phase electromagnetic fields generate ordered motions in the electrons and ions in the solid and liquid materials. The coherent motion stored kinetic energy. If the kinetic energy is large enough to destroy the crystal structures, the phase deformations happens at much under temperatures expected in the thermally equilibrium state. If it could couple to the optical light generated by thermal motions of the material, it would excite stimulated Brillouin emissions. The stimulated emission supply the energy under the thermally non-equilibrium state. © 2011 SPIE.

  90. Energy Transfer Analysis to Clear Microwave Effects in Materials: An Over View 招待有り 査読有り

    M. Sato, J. Fukushima, K. Kashimura

    International Conference on Materials for Advanced Technology (ICMAT) 2011年

  91. Theory of microwave non-thermal effect 査読有り

    Jun Fukushima, Motoyasu Sato, Keiichiro Kashimura, Motohiko Tanaka

    Microwave and RF Power Applications: Proceeding of the 13th International Conference on Microwave and Radio Frequency Heating, AMPERE 2011 27-30 2011年

    詳細を見る 詳細を閉じる

    The monochromatic and single phase electromagnetic fields generate ordered motions in the material structures. The kinetic energy converts to chemical potentials and the restructures of crystal structures independent to thermal energy. Microwave can transfer energies in keeping the lower entropy than the thermally equilibrium state. The microwave might proceed the reactions with materials under the identical principle of biological reactions.

  92. Mechanism of Processing by Irradiation of Monochromatic Coherent Electromagnetic Waves

    M. Sato, K. Kashimura, J. Fukushima, S. Takayama, K. Nagata

    Annual report of national institute for fusion science 437-437 2010年11月

  93. Improvement Devices to Measure the Partial Pressure of Out-gases during Microwave or Conventional Heating

    J. Fukushima, A. Matsubara, S. Takayama, M. Sato

    Annual report of national institute for fusion science 438-438 2010年11月

  94. Reduction Behavior of Titanium Oxides during Microwave Heating Using High Vacuum Devices

    J. Fukushima, S. Takayama, M. Sato

    Annual report of national institute for fusion science 439-439 2010年11月

  95. Reduction behavior of TiO<inf>2</inf> during microwave heating 査読有り

    J. Fukushima, S. Takayama, A. Matsubara, K. Kashimura, M. Sato

    Materials Science and Technology Conference and Exhibition 2010, MS and T'10 4 2831-2836 2010年

    詳細を見る 詳細を閉じる

    For verifying the non-equilibrium reduction under microwave heating, authors investigated the reduction behavior of TiO2 using quadruple mass spectrometer during microwave(single-mode)/conventional(electric furnace) heating under vacuum of 10-5Pa. Under microwave heating at the position of Ç-field field maximum (We call it microwave H-field heating), ΔG has decreased compared with conventional heating. Meanwhile, we reheated the sample under microwave H-field field, ΔG was identical in conventional heating excluding over 1500°C. After heated, the sample structure changed to the nano-domain structure. Moreover, when we reheated the sample by microwave H-field field after conventional heating, ΔG was also identical in conventional heating excluding over 1500°C. The outcome suggests that the non-equilibrium reduction occurs in discrete system like powder. Copyright © 2010 MS&T'10®.

  96. Mechanism of metal titanium powder nitriding under microwave heating at high oxygen partial pressure 査読有り

    Keiichiro Kashimura, Jun Fukushima, Motoyasu Sato

    Materials Science and Technology Conference and Exhibition 2010, MS and T'10 4 2827-2830 2010年

    詳細を見る 詳細を閉じる

    Chemical reaction under microwave field goes noticed as the heating mechanism has been studied. It was reported that a reduction caused by microwave heating shows different scientific behavior from that by conventional ones. Authors noticed that metal titanium powders are heated by microwave heating at high oxygen partial pressure and the oxygen partial pressure change of exhaust-gas were measured to understand the mechanism of the nitriding response using solid electrolyte oxygen sensor. The nitridation mechanism was discussed using quantum-chemical simulation for Ti14O13 model. During application of the heating, the pressure decreased to 1 × 10 -10 atm and quickly increased to 1 × 10-5 atm and then oxygen emission peaks were observed. Furthermore, quantum-chemical simulation showed that Ti-O bonding of titanium oxide is anti-bonding and consists of 3d orbital. Copyright © 2010 MS&T'10®.

  97. Studies for generations, transmissions and absorptions of coherent motions in solid and liquid materials by microwaves 査読有り

    M. Sato, K. Kashimura, Jun Fukushima, A. Matsubara

    Materials Science and Technology Conference and Exhibition 2010, MS and T'10 4 2895-2902 2010年

    詳細を見る 詳細を閉じる

    The disputed microwave effects are going to reality. The similarity was recognized well on microwave and ultrasound processing in the microstructures of material. The analogy extended to the concept of coherent phonons excited by monochromatic microwave. On the diversified discussions and lectures in conjunction with the associated basic physics, this "Electromagnetic wave (Photon) - Ultrasound (Phonon) - Mechanical work and coupling to order parameters of the matter" became the leading concept on the study of fundamental mechanism of microwave processing. Copyright © 2010 MS&T'10®.

  98. Development of the High Vacuum Device to In-Situ Measurement of Partial Pressure of Oxygen on Microwave/Conventional Heating

    J. Fukushima, A. Matsubara, K. Kashimura, S. Takayama, M. Sato

    Annual report of national institute for fusion science 420-420 2009年10月

  99. In-Situ Investigation for Microwave Reduction Process of Metal Oxides by High Vacuum Devices

    J. Fukushima, A. Matsubara, K. Kashimura, S. Takayama, M. Sato

    Annual report of national institute for fusion science 421-421 2009年10月

  100. A bird eye of the physics to the microwave interactions with materials 査読有り

    M. Sato, M. Tanaka, J. Fukushima, S. Takayama, K. Ito, A. Matsubara

    Proc. 12th International Conference on Microwave and High Frequency Heating, AMPERE 414-417 2009年9月7日

  101. Effect of microwave on reduction of metal oxides 査読有り

    J. Fukushima, H. Hiroaki, A. Matsubara, K. Kashimura, S. Takayama, M. Sato

    Proceedings of the 12th International Conference on Microwave and High Frequency Heating, AMPERE 2009 210-213 2009年

    詳細を見る 詳細を閉じる

    The reduction behavior of metal oxides during microwave/conventional heating and the structure of the heated samples were investigated. We used high vacuum device and microwave heating system. Using our devices, we were able to measure the partial pressure of oxygen almost in real time. In this experiment, CuO, Fe3O4 and rutile were used as samples. After the experiment, we measured the structure of the samples by SEM. As a result, we found that there is a possibility that the microwave heating promotes the reductive reaction for CuO and TiO2. And, we ovserved that grain boundary of the heated samples by microwave has desappeared for TiO2. In summary, it is guessed that the microwave heating promotes reduction reaction and changes the structure.

  102. In-Situ IR Diagnostics for the mm Wave/Microwave Material Heating 査読有り

    A. Matsubara, K. Nakayama, Y. Kamata, T. Hirasawa, J. Fukushima, M. Sato, S. Okajima

    2009 34TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, VOLS 1 AND 2 350-+ 2009年

    出版者・発行元:IEEE

    DOI: 10.1109/ICIMW.2009.5324636  

    詳細を見る 詳細を閉じる

    Two topics of IR-diagnostics performed in the fundamental experiment of microwave iron making will be presented. One is tunable diode laser absorption spectroscopy for both CO and CO2 gas generated during microwave irradiation. The other is spectroscopic thermography for iron oxide powder of which surface would be metallized by microwave carbothermic reduction.

  103. Formation of nano-domains by microscopic thermal non-equilibrium generated in GHz high frequency microwave field 査読有り

    M. Sato, N.Nishi, M. Tanaka, A. Matsubara, S. Takayama, H. Fukushima, M. Ignatenko, R. Roy, D. Agrawal, J. Fukushima

    Proc. 1st GCMEA 491-494 2008年8月

︎全件表示 ︎最初の5件までを表示

MISC 18

  1. 最近のマイクロ波加熱応用に関する研究(若手研究者の活躍)

    福島潤

    金属 84 (12) 10-15 2014年12月1日

    出版者・発行元:㈱アグネ技術センター

  2. マイクロ波駆動触媒反応によるリグノセルロースの熱化学変換

    椿俊太郎, 小原則子, 嘉悦陽子, 福島潤, 西岡将輝, 杉山武晴, 永長久寛, CHUN Wang-Jae, 和田雄二

    日本木材学会大会研究発表要旨集(完全版)(CD-ROM) 71st 2021年

    ISSN:1349-0532

  3. マイクロ波によるNi/Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>を介したバイオマスの触媒的急速熱分解

    椿俊太郎, 椿俊太郎, 小原則子, 嘉悦陽子, 福島潤, 西岡将輝, 杉山武晴, 永長久寛, 田旺帝, 藤井知, 和田雄二, 安田誠

    触媒討論会討論会A予稿集(CD-ROM) 128th 2021年

    ISSN:1343-9936

  4. 電磁波製鉄プロセスにおける炭素熱還元反応の周波数効果

    福島潤, 樫村京一郎

    材料とプロセス(CD-ROM) 34 (1) 2021年

    ISSN:1882-8922

  5. マイクロ波加熱を用いたペロブスカイト型酸化物を介したメタン改質反応の促進

    伊藤耕太郎, 松久将之, 椿俊太郎, 藤井知, 鈴木榮一, 福島潤, 滝澤博胤, 和田雄二

    日本化学会春季年会講演予稿集(CD-ROM) 99th 2019年

  6. マイクロ波非平衡反応の検証と材料創製への展開

    福島潤

    JEMEA機関誌 3 (2) 2017年12月

  7. マイクロ波吸収の炭素繊維アスペクト比依存性

    樫村京一郎, 福島潤, 椿俊太郎, 松沢智輝, 三谷友彦, 波岡知昭, 藤井知, 篠原真毅, 滝澤博胤, 和田雄二

    第11回日本電磁波エネルギー応用学会 2017年11月

  8. マイクロ波照射による遷移金属酸化物の還元挙動

    福島潤

    金属 85 (10) 792-797 2015年10月

    出版者・発行元:アグネ技術センター

    ISSN:0368-6337

  9. 2015年の化学:注目の論文

    福島潤

    2015年2月18日

  10. マイクロ波照射によるラムスデライト型Li-Sn-O系新規化合物の合成

    中谷友哉, 福島潤, 林大和, 滝澤博胤, 川治純, 藤枝正, 浅利裕介

    セラミックス基礎科学討論会講演要旨集 52nd 2014年

  11. マイクロ波を用いた窒化チタンコーティング法

    滝澤博胤, 福島 潤

    金属 83 (8) 694-699 2013年8月1日

    出版者・発行元:アグネ技術センター

    ISSN:0368-6337

  12. マイクロ波を用いた窒化チタンコーティング法

    滝澤博胤, 福島潤

    金属 83 (8) 30-35 2013年8月1日

    出版者・発行元:アグネ技術センター

  13. 高いQ値によって出現するマイクロ波非平衡加熱現象

    佐藤元泰, 篠原真毅, 三谷友彦, 樫村京一郎, 福島潤

    電子情報通信学会第10回無線電力伝送研究会, 第11回宇宙太陽発電と無線電力伝送に関する研究会 67-70 2012年3月

  14. マイクロ波による金属チタンの大気圧下窒化に関する考察

    樫村京一郎, 福島潤, 佐藤元泰, 三谷友彦, 篠原真毅

    第5回日本電磁波エネルギー応用学会シンポジウム 2011年11月

  15. チタン酸化物の構造変化に及ぼすマイクロ波磁場加熱の効果

    福島潤, 中村浩章, 高山定次, 佐藤元泰

    材料とプロセス(CD-ROM) 23 (2) 2010年

    ISSN:1882-8922

  16. 金属酸化物の還元に及ぼすマイクロ波の効果

    福島潤, 中村浩章, 松原章浩, 樫村京一郎, 高山定次, 佐藤元泰

    日本金属学会講演概要 144th 2009年

    ISSN:1342-5730

  17. 金属酸化物の還元に及ぼすマイクロ波の効果

    福島潤, 中村浩章, 松原章浩, 樫村京一郎, 高山定次, 佐藤元泰

    材料とプロセス(CD-ROM) 22 (1) 2009年

    ISSN:1882-8922

  18. 酸化チタンの還元,酸素移動に及ぼすマイクロ波の効果

    福島潤, 中村浩章, 松原章浩, 樫村京一郎, 高山定次, 佐藤元泰

    日本金属学会講演概要 145th 2009年

    ISSN:1342-5730

︎全件表示 ︎最初の5件までを表示

書籍等出版物 5

  1. Microwave Chemical and Materials Processing - A Tutorial

    S. Horikoshi, R.F. Schiffmann, J. Fukushima, N. Serpone

    2018年1月1日

    ISBN: 9789811064654

  2. Microwave Engineering of Nanomaterials: From Mesoscale to Nanoscale

    E. Guenin, ed, S. Takayama, M. Sato, J. Fukushima

    Pan Stanford Publishing 2016年4月28日

    ISBN: 9789814669429

  3. 最新マイクロ波エネルギーと応用技術

    福島潤

    (株)産業技術サービスセンター 2014年11月26日

  4. マイクロ波化学-反応、プロセスと工学応用-

    堀越智, 篠原真毅, 滝澤博胤, 福島潤

    三共出版 2013年12月10日

  5. マイクロ波化学プロセス技術Ⅱ

    滝澤博胤, 福島潤, 章), 他

    シーエムシー出版 2013年1月7日

    ISBN: 9784781307060

講演・口頭発表等 65

  1. Materials Processing under Non-equilibrium Reaction Field Induced by Microwave Irradiation 招待有り

    福島潤

    15th International Ceramics Congress CIMTEC2022 2022年6月22日

  2. In-situ high spatial resolution two-color thermography in microwave selective heating system 招待有り

    FUKUSHIMA Jun, TAKIZAWA, H

    Materials Science and Technology 2019 2019年10月1日

  3. マイクロ波非平衡反応の検証と材料創製への展開 招待有り

    福島潤

    第11回日本電磁波エネルギー応用学会シンポジウム 2017年11月9日

  4. In-situ Emission Spectrophotometric Analysis of Oxides Irradiated with Microwave 招待有り

    Jun Fukushima, Hirotsugu Takizawa

    Materials Science & Technology 2016 2016年10月26日

  5. Reduction enhancement of copper oxides via selective heating, internal heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation 招待有り

    Jun Fukushima, Hirotsugu Takizawa

    Pacifichem 2015 2015年12月19日

  6. 超音波を用いた銀ナノワイヤー前駆体の合成と還元形態制御による透明導電膜への実装

    増田 葉月, 林 大和, 福島 潤, 滝澤 博胤

    セラミックス協会 第34回秋季シンポジウム 2021年9月3日

  7. 固-液系反応場を用いた分散剤フリーCu ナノ粒子の高スループット合成

    高野 剛丞, 林 大和, 福島 潤, 滝澤 博胤

    セラミックス協会 第34回秋季シンポジウム 2021年9月1日

  8. 電磁波製鉄プロセスにおける炭素熱還元反応の周波数効果

    福島潤, 樫村京一郎

    日本鉄鋼協会 第181回春季講演大会 2021年3月17日

  9. マイクロ波照射による固相系材料プロセッシングのその場観察

    福島潤

    核融合科学研究所 物質科学討論会 2021年3月9日

  10. マイクロ波加熱の特徴を活かした材料合成 招待有り

    福島潤, 滝澤博胤

    MWE2020ワークショップ 2020年11月26日

  11. マイクロ波急速昇温を用いたCaH2による鉄酸化物還元の短時間化

    土田隆之, 福島潤, 林大和, 滝澤博胤

    第14回日本電磁波エネルギー応用学会シンポジウム 2020年11月5日

  12. マルチモードマイクロ波照射によるアルミナの炭素熱還元窒化挙動

    佐藤夏来, 福島潤, 林大和, 滝澤博胤

    第14回日本電磁波エネルギー応用学会シンポジウム 2020年11月5日

  13. マイクロ波プロセッシングによる(V,W)O2固溶体の作製

    酒井勇貴, 福島潤, 林大和, 滝澤博胤

    第14回日本電磁波エネルギー応用学会シンポジウム 2020年11月5日

  14. NbドープSnO2のマイクロ波合成とその磁気特性

    仲田裕貴, 福島潤, 林大和, 滝澤博胤

    第14回日本電磁波エネルギー応用学会シンポジウム 2020年11月5日

  15. マイクロ波製鉄における炭素源および周波数の影響

    福島潤, 滝澤博胤

    第14回日本電磁波エネルギー応用学会シンポジウム 2020年11月5日

  16. 無容器材料プロセッシング研究グループの紹介 -La- W-O 系新規白色蛍光体の創製-

    福島潤, キムヒョンス

    日本鉄鋼協会 第180回秋季講演大会 2020年9月18日

  17. シリカキセロゲル合成における超音波照射効果

    前田 悠希, 林 大和, 福島 潤, 滝澤 博胤

    セラミックス協会 第33回秋季シンポジウム 2020年9月3日

  18. ヒドラジンを利用したγ-Ga2O3ナノ粒子の超音波合成

    高野 裕希, 林 大和, 福島 潤, 滝澤 博胤

    セラミックス協会 第33回秋季シンポジウム 2020年9月2日

  19. 異なる周波数を有するマイクロ波に照射されたマグネタイトの微細構造と磁気特性

    土田隆之, 福島潤, 林大和, 滝澤博胤

    第13回日本電磁波エネルギー応用学会シンポジウム 2019年11月1日

  20. TiO2ナノチューブを前駆体としたマイクロ波炭素熱還元法による還元型酸化チタンナノチューブの合成

    石山剛志, 福島潤, 林大和, 滝澤博胤

    第13回日本電磁波エネルギー応用学会シンポジウム 2019年11月1日

  21. High Pressure Synthesis and Characterization of NbSn2 with the CrSi2-type Structure

    ISHIHARA, Hiroki, FUKUSHIMA, Jun, HAYASHI, Yamato, TAKIZAWA, Hirotsugu

    PACRIM13 2019年10月30日

  22. マイクロ波照射による大気圧下でのチタン粉末の窒化反応

    福島潤, 樫村京一郎, 滝澤博胤

    第13回日本電磁波エネルギー応用学会シンポジウム 2019年10月30日

  23. 窒化チタン粉末を原料にしたマイクロ波窒化チタンコーティング

    飯塚希, 福島潤, 滝澤博胤

    第13回日本電磁波エネルギー応用学会シンポジウム 2019年10月30日

  24. マイクロ波照射下での AlN 合成における分光 ・ 二次元二色温度測定

    三浦英恵, 福島潤, 林大和, 滝澤博胤

    第13回日本電磁波エネルギー応用学会シンポジウム 2019年10月30日

  25. 二次元二色温度計を用いた Fe2O3-ZnO 系選択加熱挙動のマイクロ波印加中その場観察

    仲田裕貴, 福島潤, 林大和, 滝澤博胤

    第13回日本電磁波エネルギー応用学会シンポジウム 2019年10月30日

  26. In-situ spectroscopy and two-color thermography during microwave irradiation in materials processing

    FUKUSHIMA Jun

    AMPERE 2019 - 17th International Conference on Microwave and High Frequency Heating 2019年9月11日

  27. 固体物質とマイクロ波の相互作用解析 招待有り

    福島潤

    電磁波励起反応場第 188委員会 2019年度 第2回ワークショップ ~マイクロ波加熱の学理:非熱的効果とは何か?~ 2019年6月1日

  28. 固相系マイクロ波プロセッシングにおけるその場発光分光・二次元二色温度分布測定

    福島潤

    電磁波励起反応場第 188委員会 2019年度 第1回ワークショップ ~マイクロ波「その場」観察の新展開~ 2019年5月20日

  29. アモルファス相を有する Sn-Sb ナノソルダーの室温合成

    新井 紀生, 福島 潤, 林 大和, 滝澤 博胤

    セラミックス協会 2019年年会 2019年3月26日

  30. マイクロ波照射を用いたAlN 合成における分光および二次元二色温度測定

    三浦 英恵, 福島 潤, 林 大和, 滝澤 博胤

    セラミックス協会 2019年年会 2019年3月25日

  31. TiO2ナノチューブを前駆体としたマイクロ波炭素熱還元法による 還元型酸化チタンの合成条件及び組織観察

    石山 剛志, 福島 潤, 林 大和, 滝澤 博胤

    セラミックス協会 2019年年会 2019年3月24日

  32. In-situ spectroscopy and two-dimensional two-color thermography during microwave ironmaking process

    Jun Fukushima, Hirotsugu Takizawa

    the 177th ISIJ Meeting 2019年3月20日

  33. マイクロ波プロセスによるTiNコーティング膜作製への原料Ti粉末粒径の影響

    飯塚 希, 福島 潤, 林 大和, 滝澤 博胤

    第12回日本電磁波エネルギー応用学会 2018年11月16日

  34. マイクロ波磁場印加中におけるNiMn2O4還元反応のカイネティクス

    福島 潤, 高山 定次, 佐藤 元泰, 滝澤 博胤

    第12回日本電磁波エネルギー応用学会 2018年11月16日

  35. マイクロ波励起プラズマによるAl2O3炭素熱還元窒化反応促進効果

    三浦 英恵, 福島 潤, 林 大和, 滝澤 博胤

    第12回日本電磁波エネルギー応用学会 2018年11月16日

  36. 澱粉を炭素源としたマイクロ波熱還元法によるTi4O7ナノ粒子の合成

    石山 剛志, 福島 潤, 林 大和, 滝澤 博胤

    第12回日本電磁波エネルギー応用学会 2018年11月16日

  37. 酸化スカンジウムのマイクロ波照射による還元

    藤井 知, 椿 俊太郎, 鈴木 榮一, 稲津 直美, 和田 雄二, 福島 潤, 滝澤 博胤

    第12回日本電磁波エネルギー応用学会 2018年11月15日

  38. Effect of multimode and single-mode microwave processing of anisotropic grain growth of CuFeO2

    FUKUSHIMA Jun

    Asia-Pacific Microwave Conference 2018 2018年11月9日

  39. マイクロ波プロセッシングによるTi4O7ナノ粒子径の制御

    福島 潤, 滝澤 博胤

    粉体粉末冶金協会 秋季講演大会 2018年10月31日

  40. 異なる配向性を有する Mo下地を用いた Nd2Fe14Bc軸配向膜の作製

    土田 隆之, 福島 潤, 林 大和, 齊藤 伸, 滝澤 博胤

    粉体粉末冶金協会 秋季講演大会 2018年10月30日

  41. In-situ spectroscopic analysis of the microwave carbothermal reduction of iron oxides

    Jun Fukushima, Hirotsugu Takizawa

    The 9th International Symposium on Electromagnetic Processing of Materials (EPM2018) 2018年10月

  42. マイクロ波還元マグネタイトを用いた2 step cycle によるCO2 資源化プロセスのその場ガス分析

    福島 潤, 田中 将裕

    日本鉄鋼協会秋季講演大会 2018年9月21日

  43. ディスペンサー装置を用いた針状ナノ粒子の配列制御による銀ナノワイヤー透明導電膜の作製

    藤田 恭輔, 林 大和, 福島 潤, 滝澤 博胤

    セラミックス協会 第31回秋季シンポジウム 2018年9月5日

  44. マイクロ波によって固体粒子表面に誘起されるミクロ超高温場の直接観測

    阿野 大史, 山本 昌紀, 北川 祐一, 福島 潤, 椿 俊太郎, 米谷 真人, 長谷川 靖哉, 滝澤 博胤, 和田 雄二

    第121回触媒討論会 2018年3月22日

  45. マイクロ波プロセスによるデラフォサイト型CuFeO2の異方粒成長促進メカニズム

    福島 潤, 滝澤 博胤

    日本鉄鋼協会 第175回春季講演大会 2018年3月21日

  46. マイクロ波電場および磁場中における Nd-Fe-Ti 系永久磁石材料の窒化挙動

    飯塚 希, 福島 潤, 岸 本 秀史, 林 大和, 滝澤 博胤

    セラミックス協会 2018年年会 2018年3月17日

  47. 高速スパッタリングによる Nd2Fe14B 配向膜の作製

    土田 隆之, 福島 潤, 林 大和, 滝澤 博胤

    セラミックス協会 2018年年会 2018年3月17日

  48. ディスペンサー塗布を用いた基板上銀ナノワイヤーの配列制御

    藤田 恭輔, 林 大和, 福島 潤, 滝澤 博胤

    セラミックス協会 2018年年会 2018年3月17日

  49. マイクロ波照射下における固体粒子接触点近傍における特異的な高温場形成の解析

    羽石 直人, 椿 俊太郎, 米谷 真人, 鈴木 榮一, 藤井 知, 福島 潤, 滝澤 博胤, 和田 雄二

    第11回日本電磁波エネルギー応用学会 2017年11月10日

  50. マイクロ波照射を利用した Nd-Fe-Ti 系永久磁石材料の窒化挙動

    飯塚 希, 福島 潤, 林 大和, 滝澤 博胤

    第11回日本電磁波エネルギー応用学会シンポジウム 2017年11月9日

  51. NdFeB磁性薄膜のマイクロ波プロセッシング

    土田 隆之, 福島 潤, 林 大和, 滝澤 博胤

    第11回日本電磁波エネルギー応用学会シンポジウム 2017年11月9日

  52. マイクロ波プロセッシングにおける TiO2-VO2系スピノーダル曲線

    青柳 宗一郎, 福島 潤, 林 大和, 滝澤 博胤

    第11回日本電磁波エネルギー応用学会シンポジウム 2017年11月9日

  53. マイクロ波吸収の炭素繊維アスペクト比依存性

    樫村 京一郎, 福島 潤, 椿 俊太郎, 松沢 智輝, 三谷 友彦, 波岡 知昭, 藤井 知, 篠原 真毅, 滝澤 博胤, 和田 雄二

    第11回日本電磁波エネルギー応用学会シンポジウム 2017年11月9日

  54. 酸化鉄の炭素熱還元プロセスにおけるマイクロ波照射中その場分光分析

    福島 潤, 滝澤 博胤

    日本鉄鋼協会 第174回秋季講演大会 2017年9月6日

  55. 無容器材料プロセッシング研究グループの紹介-La-W-O系新規蛍光体の創製

    福島 潤, 滝澤 博胤

    日本鉄鋼協会 第174回秋季講演大会 2017年9月6日

  56. フラックスを用いたCrナノ粒子の低温焼結による硬質膜の作製

    小出真路, 林大和, 福島潤, 滝澤博胤

    粉体粉末冶金協会平成28年度秋季大会 2016年11月10日

  57. Materials Processing under Non-equilibrium Reaction Field Induced by Microwave Irradiation

    Jun Fukushima, Hirotsugu Takizawa

    The 3rd CWRU-Tohoku Joint workshop, Collaboration on Data Science Engineering 2016年8月9日

  58. #360 国際会議

    PacifiChem2015 2015年12月15日

  59. 遷移金属酸化物におけるマイクロ波誘起ルミネッセンス

    福島潤, 佐藤元泰, 樫村京一郎, 林大和, 滝澤博胤

    第6回日本電磁波エネルギー応用学会シンポジウム 2012年10月3日

  60. マイクロ波プロセスにおける重畳発光現象

    佐藤元泰, 松原章浩, 樫村京一郎, 福島潤

    第6回日本電磁波エネルギー応用学会シンポジウム 2012年10月3日

  61. マイクロ波照射による窒化チタンコーティング膜の作成と応用

    北爪大地, 福島潤, 林大和, 滝澤博胤

    第6回日本電磁波エネルギー応用学会シンポジウム 2012年10月3日

  62. 貴金属添加デラフォサイト型CuFeO<SUB>2</SUB>のマイクロ波プロセッシング

    中島巧, 福島潤, 林大和, 滝澤博胤

    第6回日本電磁波エネルギー応用学会シンポジウム 2012年10月3日

  63. Fe<SUB>2</SUB>O<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>の混合粉末の固相反応によるFeAl<SUB>2</SUB>O<SUB>4</SUB>合成におけるマイクロ波電場・磁場の効果

    福島潤, 林大和, 滝澤博胤

    セラミックス協会第25回秋期シンポジウム 2012年9月19日

  64. 超音波アブレーションによるAg-grassナノコンポジット粒子の合成と焼結挙動

    瀧澤洸, 林大和, 福島潤, 滝澤博胤

    セラミックス協会第25回秋期シンポジウム 2012年9月19日

  65. 大気中での焼結を目的としたPd微量複合化Cuナノ粒子の超音波合成と評価

    講武裕朗, 林大和, 福島潤, 滝澤博胤

    セラミックス協会第25回秋期シンポジウム 2012年9月19日

︎全件表示 ︎最初の5件までを表示

共同研究・競争的資金等の研究課題 13

  1. 高次探索空間におけるバルク準安定相のハイスループット合成とその創出プロセス確立

    福島 潤, 滝沢 博胤

    2022年4月1日 ~ 2027年3月31日

  2. マイクロ波増強電磁場による「超」高速バイオマス-炭素熱還元

    椿 俊太郎, 藤井 知, 福島 潤

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    研究種目:Grant-in-Aid for Scientific Research (B)

    研究機関:Kyushu University

    2022年4月1日 ~ 2025年3月31日

  3. CO2を炭素源とした産廃由来炭化ケイ素合成の研究開発

    福島潤

    2022年4月 ~ 2025年3月

  4. マイクロ波ドライプロセスによるTiN表面改質のインプラントアバットメントへの応用

    伊東 明代, 小川 徹, 福島 潤, 洪 光, 滝沢 博胤, 佐々木 啓一

    2021年4月1日 ~ 2024年3月31日

    詳細を見る 詳細を閉じる

    TiNコーティングは, 硬度, 耐摩耗性, 耐食性等に優れ, 審美的な金色を呈すること, さらに抗菌性や生体親和性も期待されるため, 歯科インプラントアバットメント表面の機能向上にも適していると考えられる. しかし, 従来の成膜法(PVD法, CVD法等)では, アバットメントのような複雑な立体構造体への応用は難しく, 成膜プロセス上の煩雑さ, 安全面やコスト面においても様々な問題が残されている. マイクロ波ドライプロセスTiNコーティング法は,圧力や雰囲気置換を行わない大気中においてTiN形成が可能という独自性を持ち, 安価で簡便なプロセスであり, アバットメントへの応用に適している. 本研究は, 硬度, 耐摩耗性, 耐食性, 審美性, 細胞動態および軟組織封鎖性という観点から, マイクロ波ドライプロセスTiNコーティング法のアバットメント表面における最適成膜条件の探索を行い, トランスレーショナルリサーチの展開へ向けての基盤を形成する. 今年度は, 市販のアバットメントへの応用を想定した試料の作製・材料学的評価を進めた. Ti6Al4円盤(直径5mm, 厚さ1mm)にマイクロ波ドライプロセスによるTiNコーティングを施した試料を作製した. 反応時間は10分とし, 800℃, 850℃, 900℃, 950℃, 1000℃の反応温度でコーティングを施した. SEM像では全ての反応温度において波模様の微細構造を認めた. XRD分析の結果からは, 反応温度が高いほど窒化が進行しており, 950℃, 1000℃でTiNを認めた. この結果, 市販のアバットメントへの成膜条件として, 上記の反応温度が妥当であることが確認された.

  5. 軽元素を利用した新しい物質合成法の確立と希土類フリー磁石材料への展開

    佐久間 昭正, 飛世 正博, 土井 正晶, 齊藤 伸, 吉村 哲, 三浦 大介, 福島 潤, 小田 洋平, 栂 裕太

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    研究種目:Grant-in-Aid for Scientific Research (S)

    研究機関:Tohoku University

    2019年6月26日 ~ 2024年3月31日

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    希土類フリー磁石材料を、理論と実験の協業により創出する研究を開始した。 (1) 軽元素を利用した新しい物質合成法のメカニズム解明:Fe水酸化物の還元によるナノクラスター組織の形成過程および窒化物経由による炭化物形成過程を明らかにするために(Fe,M)OOHの還元条件をかえてFe-M合金 (M=none, Co, Ni, Mn等) を作製し窒化処理を行った。Nが結晶格子間に侵入するための必要条件としてFe-M合金の結晶子の大きさが関係していることが明らかになり、軽元素を結晶格子間に侵入させるための有用な指針を得ることができた。 (2) 新しい物質合成法の応用:希土類フリー系としてMn合金に着目しFe-Mn-Ga 薄膜を検討した。従来のD022型Mn3Ga系材料で高い磁気異方性Kuや高い保磁力Hcが確認されているが、フェリ磁性のため飽和磁化Bsが低いという課題があった。しかしながらFe-Mn-Ga系においてフェリ磁性からフェロ磁性への磁気相転移の観点から検討を行った結果、高いBs=1.1 Tと同時に高いKu>2.0 MJ/m3を得ることができ、希土類フリー磁石材料の候補として大きなポテンシャルを有していることがわかった。 (3) 理論計算による希土類フリー磁石材料の設計指針構築: 不規則度依存性を再現するスピンモデルの構築および,その物理的起源について考察を行った.その結果2-site間のスピンの積として発生する磁気異方性エネルギーが,そのボンド方向を磁化困難軸として取ると仮定することで,旧来の実験及び第一原理計算における不規則度依存性をスピンモデルにおいて再現することを見出した.加えて,ここで仮定したボンド方向依存の磁気異方性が実際に生じることを第一原理計算によって確認している.

  6. 酸化スカンジウム精錬技術の高度化に向けた装置開発と応用

    大川裕也, 藤井知, 福島潤

    2022年6月 ~ 2024年3月

  7. 超高比表面積スピネルを用いた電磁波化学プロセスによるCO2の高効率資源化

    提供機関:Environmental Restoration and Conservation Agency, ERCA

    2021年4月 ~ 2024年3月

  8. マイクロ波誘起非平衡状態の学理とその固体・界面化学反応制御法への応用展開

    和田 雄二, 滝沢 博胤, 田 旺帝, 堀部 雅弘, 藤井 知, 吉川 昇, 西岡 将輝, 中村 考志, 椿 俊太郎, 福島 潤

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    研究種目:Grant-in-Aid for Scientific Research (S)

    研究機関:Tokyo Institute of Technology

    2017年5月31日 ~ 2022年3月31日

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    1)マイクロ波反応のin situ 測定:マイクロ波(MW)照射によって固体表面や固体バルクに生じる非平衡状態を観測可能な、MW in situ XAFS、二次元二色温度計プラズマ同時観測測定装置などの観測装置群を完成した。MW in situ XAFS測定により、MW照射中に得たEXAFSスペクトルから、温度依存的なDebye-Waller因子を抽出することで、光学イメージングでは検出不能なナノメートルスケールの担持白金ナノ粒子触媒上の金属粒子の温度情報を測定した。MW照射中の担持金属は周囲の金属酸化物担体と比較して26~132K高温になっていることを明らかにした。また、二次元二色温度計プラズマ同時観測測定装置により、最高2.2ミクロン/pixelの空間分解能で、局所温度勾配を定量化できる装置を開発し、Al2O3-C選択加熱系において、カーボンファイバーが選択的にマイクロ波によって加熱されAl2O3との温度差は7600℃/mmの巨大な温度勾配が生じていること見出した。 2)新触媒反応への応用:マイクロ波照射により、金属酸化物触媒によるアルコールの脱水反応、Ni粒子(電子供与体)からメチルビオロゲン(電子受容体)への電子移動反応、α-Fe2O3電極による水の電界酸化反応において促進が生じることを実証した。 3)新材料合成反応への応用:二次元二色温度計プラズマ同時観測測定装置を用い、マイクロ波電磁場下での金属粒子の窒化反応促進メカニズムを解析した。Ti粉末へマイクロ波照射した際のin situ発光分光を行った。非常に短時間のプラズマ形成が窒化プロセスに関与することが明らかにし、窒化反応促進メカニズムを提起した。さらに、新奇機能物質のマイクロ波合成として、BaTiO3-CoFe2O4マルチフェロイック材料の創製やTi4O7ナノロッド合成に成功した。

  9. 新規結晶構造・特異的配位多面体歪を有する白色・赤色蛍光体の無容器プロセッシング

    福島 潤

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    研究種目:Grant-in-Aid for Early-Career Scientists

    研究機関:Tohoku University

    2019年4月1日 ~ 2021年3月31日

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    本研究では、無容器プロセッシングによる白色・赤色新規蛍光体材料の創製を目指し、急冷による準安定相の創出を行っている。今年度は、La-W-O系新規準安定相の合成条件を明確にするため、La2O3-WO3擬二次元相図における、WO3約80 mol%の共晶組成付近において、組成を変化させて合成実験を行った。共晶組成よりWO3リッチの条件では既知の結晶構造しか得られず、そのサンプルは蛍光を示さなかった。一方、La2O3リッチ側では比較的安定にunknown相が生じ、白色蛍光を示した。これを800 ℃でアニールすると、unknown相は消失し既知の結晶構造を持つLa-W-O系酸化物となった。このことから、このunknown相が過冷却によって得られた準安定相であると推定した。また、上記組成検討実験から、unknown相は共晶組成より若干Laリッチであると推定されるが、未だ単一相は得られておらず、完全な組成決定には至っていない。また、このunknown相を含む試料は既知の蛍光体であるCaWO4と比較して赤色成分の大きな白色蛍光を示す。ブロードな発光であることから、W6+の電荷移動遷移型発光であると考えられる。この蛍光特性について詳細を明らかにするためにはunknown相の結晶構造同定が必須であり、現在Reitveld解析およびTEMによる解析などを進めている。また、より高温における材料探索と冷却速度のコントロールを実現するため、レーザー加熱により1900℃以上の高温を達成できる装置に、二つのハロゲンランプをセッティングしたハイブリッド炉を完成させた。

  10. 軽元素を利用した新しい物質合成法の反応メカニズムの解明と磁石材料設計指針の構築

    佐久間 昭正, 飛世 正博, 土井 正晶, 齊藤 伸, 吉村 哲, 福島 潤, 三浦 大介, 小田 洋平, 栂 裕太

    2019年4月1日 ~ 2020年3月31日

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    希土類フリー磁石材料の開発は、我が国のエネルギー戦略における最重要テーマの一つである。本研究はこれまでの当該分野の研究成果を踏まえ、軽元素(H,C,O,N)を利用した新しい物質合成法の反応メカニズムを解明するとともに、軽元素がFe合金の磁性に与える影響を理論計算によって解析し、希土類フリー磁石材料の材料設計指針を構築することを目標としている。初年度前半(4月~6月)は、1.酸化物経由によるナノ組織の形成過程の解析および2.磁気異方性、交換相互作用の第一原理計算について予備検討を開始した。1.においてはこれまでFeの酸化物のみを対象としていたが、今回Fe合金まで範囲を広げて検討した。最初にFe-M合金(M=Si、Mn、Ni)において空気を流した場合の酸化開始温度を求めた。M元素を添加することによって酸化開始温度は高くなり、約800 ℃以上となった。Feの場合は約400 ℃であるから大幅に高くなる。元素によって異なるものの、800~1000 ℃の間で(Fe,M)2O3あるいは(Fe,M)3O4の酸化物を得ることができた。次にこれらの還元条件を検討した。還元は水素ガスを流しながら行った。これも元素によって異なるものの役500 ℃以上でFeに還元されることがわかった。結晶子の大きさも還元温度が高くなるにしたがい増大する傾向にあるが、無添加の場合と比べて結晶子の大きさは小さく、M元素に粒成長抑制の効果があることがわかった。2.においては、理論計算の対象とする物質のスクリーニングを開始した。基盤研究Sに採択されたため本研究は廃止になったが、当該内容を継続して研究を進める。

  11. マイクロ波ドライプロセスによる歯科インプラントアバットメントのTiN表面改質

    伊藤 彩, 佐々木 啓一, 小川 徹, 佐藤 奈央子, 滝沢 博胤, 福島 潤

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    研究種目:Grant-in-Aid for Scientific Research (C)

    研究機関:Tohoku University

    2017年4月1日 ~ 2020年3月31日

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    マイクロ波ドライプロセスによる新規のTiNコーティング法の歯科インプラントアバットメントの表面改質への応用を最終目標とし、本研究では、アバットメント用チタン合金における成膜条件の機械的・生物学的な最適化について検討を行った。その結果、特定条件でマイクロ波ドライプロセスTiNコーティングを施した表面では、優れた機械的特性に加え、インプラント周囲軟組織において、歯肉線維芽細胞の初期付着を促進する可能性があることが示唆された。

  12. 電磁波材料プロセッシングにおける非熱的効果の解明-電磁波化学という新領域の創出

    福島 潤

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    研究種目:Grant-in-Aid for Challenging Exploratory Research

    研究機関:Tohoku University

    2015年4月1日 ~ 2017年3月31日

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    マイクロ波印加下における化学反応の駆動力が、マイクロ波照射由来の熱エネルギーのみならず、マイクロ波エネルギーが熱緩和する前に化学エネルギーなどに変遷する仮説を証明するべく、マイクロ波印加下における材料からの発光分光を通じて、マイクロ波エネルギーが光エネルギーに直接変遷する過程の実測に挑戦した。マイクロ波印加下における発光分光装置の整備を行い、還元型酸化チタン(TiO2-x)を材料として選択し、マイクロ波照射下でのin-situ発光分光測定を行った。その結果、熱輻射に重畳した高強度の非熱的発光を観測し、熱緩和とは異なるエネルギーパスの存在を示唆する結果を得た。

  13. 変調マイクロ波加熱による遷移金属酸化物の還元促進・構造変化に関する研究

    福島 潤

    2012年 ~ 2013年3月31日

︎全件表示 ︎最初の5件までを表示

担当経験のある科目(授業) 42

  1. 創造工学研修

  2. 化学・バイオ工学演習

  3. 化学・バイオ工学実験

  4. 化学・バイオ工学実験

  5. 化学・バイオ工学演習

  6. 化学・バイオ工学実験

  7. 創造工学研修

  8. 固体化学

  9. 化学・バイオ工学演習

  10. 化学・バイオ工学実験

  11. 創造工学研修

  12. 化学・バイオ工学演習

  13. 化学・バイオ工学実験

  14. 創造工学研修

  15. 機能無機材料科学

  16. 化学・バイオ工学演習

  17. 化学・バイオ工学実験

  18. 創造工学研修

  19. 化学・バイオ工学実験

  20. 固体化学

  21. 化学・バイオ工学演習

  22. 化学・バイオ工学実験

  23. 機能無機材料科学

  24. 創造工学研修

  25. 化学・バイオ工学実験

  26. 固体化学

  27. 化学・バイオ工学演習

  28. 化学・バイオ工学実験

  29. 創造工学研修

  30. 固体化学

  31. 化学・バイオ工学演習

  32. 化学・バイオ工学実験

  33. 機能無機材料科学

  34. 創造工学研修

  35. 化学・バイオ工学実験

  36. 固体化学

  37. 化学・バイオ工学演習

  38. 化学・バイオ工学実験

  39. 創造工学研修

  40. 化学・バイオ工学実験

  41. 化学・バイオ工学演習

  42. 化学・バイオ工学実験

︎全件表示 ︎最初の5件までを表示

社会貢献活動 5

  1. イノベーションフェア2014 Dec.

    2014年12月4日 ~

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    東北大学イノベーションフェアにて、滝澤研究室の研究成果を展示し、研究成果の社会への還元を図る。

  2. 東北大学イノベーションフェア2014

    2014年1月28日 ~

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    東北復興・日本再生に向けた未来へのテクノロジーの種となる研究成果を広くご紹介するイノベーションの見本市において、当研究室の成果を発表した。

  3. 第99回サイエンス・カフェ

    2013年12月13日 ~

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    東北大学におけるサイエンスカフェにおいて、滝澤先生の講演が行われた。その際の補助業務を行った。

  4. 東北大学イノベーションフェア2013

    2013年1月17日 ~

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    東北復興・日本再生に向けた未来へのテクノロジーの種となる研究成果を広くご紹介するイノベーションの見本市において、当研究室の成果を発表した。

  5. 宮城県宮城野高等学校 訪問学習

    2012年8月3日 ~

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    宮城野高校では、2年生を対象に、主体的な進路選択能力や社会性を高めるために、「総合的な学習の時間(校内名称 フロンティア・タイム)」の授業の一環として訪問学習を実施している。 上記の趣旨のもと、滝澤研究室において高校生3名に対し、マイクロ波の研究について紹介を行うとともに、研究室所有の実験装置などを見学して頂いた。

メディア報道 9

  1. CO2を資源に 最先端の「カーボンリサイクル」研究が瀬戸内の島で進むわけ

    NHK おはよう日本 おはBiz https://www3.nhk.or.jp/news/contents/ohabiz/articles/2024_0216.html

    2024年2月16日

    メディア報道種別: テレビ・ラジオ番組

  2. 二酸化炭素を資源に?瀬戸内海に浮かぶ研究所

    NHK広島 お好みワイドひろしま

    2024年1月23日

    メディア報道種別: テレビ・ラジオ番組

  3. 脱炭素技術、実証を加速

    日刊工業新聞

    2022年9月15日

    メディア報道種別: 新聞・雑誌

  4. “二酸化炭素を再利用” 国の研究施設が大崎上島町に完成

    NHK広島

    2022年9月

    メディア報道種別: テレビ・ラジオ番組

  5. 東北大/CO2資源化技術を活用/炭化ケイ素合成の事業化検証

    鉄鋼新聞

    2022年5月18日

    メディア報道種別: 新聞・雑誌

  6. 東北大学、カーボンリサイクル技術の事業化を検証

    EE Times Japan

    2022年5月13日

    メディア報道種別: インターネットメディア

  7. 東北大、カーボンリサイクル技術による廃棄物を原料とした炭化ケイ素合成研究を推進

    日本経済新聞

    2022年5月11日

    メディア報道種別: 新聞・雑誌

  8. NHK world Science View "Magic Microwave"

    2013年9月10日

    メディア報道種別: テレビ・ラジオ番組

  9. サイエンスZERO「電子レンジで鉄が作れる!? 未知のマイクロ波効果を活用せよ」

    2013年1月27日

    メディア報道種別: テレビ・ラジオ番組

︎全件表示 ︎最初の5件までを表示

その他 5

  1. Reduction enhancement of copper oxides via selective heating, internal heating and cleavage of Cu-O bond by microwave magnetic-field irradiation

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    Pacifichemにおいて、上記題目にて招待講演を行う。

  2. マイクロ波照射下における強磁性酸化物の還元における基礎物理

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    本研究では、マイクロ波照射下における強磁性酸化物の還元挙動を通じ、電磁波と物質の相互作用を、プラズマ物理の手法を基礎として、物性物理の視点から究明する。 マイクロ波は新奇材料合成プロセスにおけるエネルギー供給源として注目されているが、そのポテンシャルを発揮するためにはマイクロ波周波数帯における電磁波と物質の相互作用を理解する必要がある。その特異な相互作用はマイクロ波エネルギーフローがある状況(非平衡)でのみ発生する。よって、熱力学(平衡)を基礎とする物質科学と非平衡を基礎とするプラズマ科学の中間の学問領域であり、メカニズムの解明が進んでいない。 本研究では、核融合研に整備されているマイクロ波照射装置、in-stu還元反応測定装置、ネットワークアナライザー、スペアナなどを利用し、マイクロ波照射下における強磁性酸化物の還元挙動を測定し、プラズマ物理と物性物理の協同により研究を進める。

  3. Synthesis of Copper Spinels by Microwave Irradiation

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    アメリカ最大のマテリアルサイエンスを対象とした学会において、申請者の研究成果を発表するとともに、同分野の研究者とのディスカッションを通じて最先端の情報をおよび今後の研究指針を得る。さらに、国際的なネットワーク構築も目的とする

  4. マイクロ波照射下における強磁性酸化物の還元における基礎物理

    詳細を見る 詳細を閉じる

    本研究では、マイクロ波照射下における強磁性酸化物の還元挙動を通じ、電磁波と物質の相互作用を、プラズマ物理の手法を基礎として、物性物理の視点から究明する。 マイクロ波は新奇材料合成プロセスにおけるエネルギー供給源として注目されているが、そのポテンシャルを発揮するためにはマイクロ波周波数帯における電磁波と物質の相互作用を理解する必要がある。その特異な相互作用はマイクロ波エネルギーフローがある状況(非平衡)でのみ発生する。よって、熱力学(平衡)を基礎とする物質科学と非平衡を基礎とするプラズマ科学の中間の学問領域であり、メカニズムの解明が進んでいない。 本研究では、核融合研に整備されているマイクロ波照射装置、in-stu還元反応測定装置、ネットワークアナライザー、スペアナなどを利用し、マイクロ波照射下における強磁性酸化物の還元挙動を測定し、プラズマ物理と物性物理の協同により研究を進める。

  5. 卑金属ナノ粒子によるプリント利用技術普及のための低コスト・大量合成プロセスの開発

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    自動車部品や電子デバイス等における部品の配線やメッキ代替への応用を目的とした銅・ニッケル・クロム等の卑金属ナノ粒子の合成に関して、高価な製品から廉価な製品にまで利用を拡大するために、高濃度で安価でかつサステナブルに低環境負荷を同時に実現する高効率なスループット合成を確立する。