Details of the Researcher

PHOTO

Hiroki Yamada
Section
Institute for Materials Research
Job title
Associate Professor
Degree
e-Rad No.
50873684

Research History 6

  • 2026/04 - Present
    Tohoku University　Institute for Materials Research　Associate Professor

  • 2024/04 - 2026/03
    Japan Synchrotron Radiation Research Institute　Senior Scientist

  • 2023/04 - 2026/03
    Shimane University

  • 2020/02 - 2024/03
    Japan Synchrotron Radiation Research Institute　Scientist

  • 2021/10 - 2021/12
    Wigner Research Centre for Physics　Visiting Scientist

  • 2019/04 - 2020/01
    National Institute of Advanced Industrial Science and Technology　Postdoctoral Researcher

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Committee Memberships 3

  • 特定放射光施設ユーザー協同体 ダイナミック/非平衡構造物質研究会　副代表

    2026/04 - Present

  • SPring-8 News編集委員

    2022/04 - 2023/03

  • 化学工学誌　学生編集委員

    2016/04 - 2017/03

Research Interests 1

  • ゼオライト 二体分布関数解析 放射光

Research Areas 1

  • Nanotechnology/Materials / Nanostructure chemistry /

Awards 3

  1. 2025年度理事長賞

    2025/04　高輝度光科学研究センター　ハイスループットPDF 測定装置の開発

  2. 第35回秋季シンポジウム セッション優秀講演賞

    2022/09　日本セラミックス協会

  3. 第29回秋季シンポジウム セッション奨励賞

    2016/09　日本セラミックス協会

Papers 85

  1. Recent Advances in High-Throughput X-ray Total Scattering Measurements and Data Analysis

    Hiroki YAMADA, Seiya SHIMONO

    Nihon Kessho Gakkaishi　2026/05/31

    DOI： 10.5940/jcrsj.68.73 　

    ISSN： 0369-4585 1884-5576

  2. Bottom‐Up Assembly of Amorphous Metal–Organic Frameworks From Proton Conductive Metal–Organic Polyhedra

    Nattapol Ma, Daiki Umeyama, Hiroki Yamada, Soracha Kosasang

    Small　2026/05/13

    DOI： 10.1002/smll.73752 　

    ISSN： 1613-6810 1613-6829

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    <jats:title>ABSTRACT</jats:title> <jats:p> While crystalline metal–organic frameworks (MOFs) benefit from precise structural programmability, achieving comparable control in amorphous MOFs (aMOFs) remains underexplored. Most reported aMOFs are obtained via top‐down amorphization of crystalline frameworks, whereas the limited bottom‐up approaches typically rely on linker substitution‐based assembly that inherently restricts node‐level functionalization. Here, we present a bottom‐up strategy for constructing proton‐conductive aMOFs using sulfonate‐rich metal–organic polyhedra (MOPs) as predesigned molecular building units. Discrete Rh‐based MOPs with accessible axial coordination sites are crosslinked with flexible ditopic linkers to form extended amorphous networks while preserving intrinsic node functionality. Variation of linker identity modulates network connectivity, free volume, water stability, and proton transport behavior. Retention of the sulfonate group from the MOP building units affords aMOFs with proton conductivities of up to 4.8 mS cm <jats:sup>−1</jats:sup> at 85°C and 90% relative humidity, with a low activation energy of 0.20 eV, whereas the sulfonate‐free aMOF analog exhibits insulating behavior. These results establish a general strategy for the rational design of functionally programmable aMOFs using chemically predefined building units. </jats:p>

  3. WebPDF: a browser-based software application for calculating X-ray pair distribution function

    Hiroki Yamada, Takuto Fukuoka, Kei Watanabe, Seiya Shimono, Yuki Sada, Kengo Nakada, Toshiyuki Matsunaga, Yoshiharu Uchimoto, Koji Ohara

    Analytical Sciences　2026/05/01

    DOI： 10.1007/s44211-026-00917-x 　

  4. Design of a two-step synthesis route for EMC-2 guided by crystallization behavior and the role of 18-crown-6 ether

    Kotori Matsuo, Hiroki Yamada, Chang Yi Kong, Takahiko Moteki

    Microporous and Mesoporous Materials　2026/05

    DOI： 10.1016/j.micromeso.2026.114128 　

    ISSN： 1387-1811

  5. Tuning optical properties of densified silica glass via high pressure and ultrafast laser excitation

    Misora Tsubone, Yasuhiko Shimotsuma, Yoshio Kono, Sho Kakizawa, Hiroki Yamada, Keita Kobayashi, Masahiro Shimizu, Kiyotaka Miura

    NPG Asia Materials　2026/04/27

    DOI： 10.1038/s41427-026-00649-4 　

  6. Sr5V1.5Fe3.5O15: A Transition-Metal-Ordered Perovskite with 5-Fold Superstructure along [111]pc Direction

    Teppei Nagase, Takumi Nishikubo, Kei Shigematsu, Yuki Sakai, Takashi Honda, Ko Mibu, Hiroki Yamada, Hiroki Matsumura, Shunsaku Kitagawa, Kenji Ishida, Masaki Azuma, Takafumi Yamamoto

    Inorganic Chemistry　2026/04/13

    DOI： 10.1021/acs.inorgchem.6c01150 　

  7. Structural and dynamic studies on vapor-deposited amorphous methane hydrate

    Menghan Zhang, Hiroshi Akiba, Iwao Matsuda, Hiroki Yamada, Seiya Shimono, Takashi Honda, Genki Kobayashi, Osamu Yamamuro

    The Journal of Chemical Physics　2026/03/21

    DOI： 10.1063/5.0323888 　

  8. Revealing the Role of 3-Membered Rings in the Formation of VSV-type Zincosilicate Zeolite

    Zimu Zhou, Peidong Hu, Hiroki Yamada, Koji Ohara, Yasuo Yonezawa, Tatsuya Okubo, Toru Wakihara

    Microporous and Mesoporous Materials　2026/03

    DOI： 10.1016/j.micromeso.2026.114120 　

    ISSN： 1387-1811

  9. High-throughput X-ray total scattering measurement system at BL04B2 of SPring-8

    Hiroki Yamada, Seiya Shimono, Shogo Kawaguchi, Koji Ohara, Kei Watanabe, Michitaka Takemoto, Jo-chi Tseng, Masakuni Takahashi, Yuki Sada, Hiroshi Yamazaki, Haruhiko Ohashi, Yasuhiko Imai, Takaki Hatsui, Ichiro Inoue, Shigeru Kimura, Kunihisa Sugimoto, Makina Yabashi, Osami Sakata, Yuji Higo, Kenji Tamasaku

    Journal of Synchrotron Radiation　2026/03/01

    DOI： 10.1107/S1600577525011294 　

  10. Meltable Semiconductive Lead–Thiolate Coordination Polymers with Long Alkyl Chains

    Ryohei Akiyoshi, Shunya Takamura, Chie Sawada, Naohiro Takahashi, Takashi Okubo, Akinori Saeki, Zi Lang Goo, Kunihisa Sugimoto, Yuki Mori, Shogo Kawaguchi, Yuiga Nakamura, Toshiaki Ina, Misaki Katayama, Hiroki Yamada, Seiya Shimono, Takuya Kurihara, Kazuyoshi Ogasawara, Daisuke Tanaka

    Angewandte Chemie International Edition　2026/02/09

    Publisher: Wiley

    DOI： 10.1002/anie.202518379 　

    ISSN： 1433-7851

    eISSN： 1521-3773

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    ABSTRACT Meltable organic–inorganic hybrid semiconductors are attractive for their potential for melt‐based processing. Although meltable semiconducting metal halide perovskites have been extensively studied, meltable semiconducting coordination polymers (CPs) remain scarce, despite their excellent structural designability and the tunability of their optoelectronic properties. We report a new family of meltable semiconductive Pb(II) benzenethiolate CPs bearing long alkyl chains, formulated as [Pb(SPhOC 6 ) 2 ] n ( KGF‐34(C6) ; HSPhOC 6 = 4‐hexyloxybenzenethiol). For comparison, we also synthesized the classical analogue [Pb(SC 6 ) 2 ] n ( KGF‐59(C6) ; HSC 6 = 1‐hexanethiol). Single‐crystal X‐ray diffraction analyses revealed that both KGF‐34(C6) and KGF‐59(C6) adopt 2D architectures, albeit with distinct inorganic (–Pb–S–) n networks. A comprehensive characterization of the semiconducting properties, combined with first‐principles calculations, revealed that KGF‐34(C6) exhibits significantly higher photoconductivity, a narrower band gap, and a larger band dispersion than KGF‐59(C6) , attributable to differences in their inorganic (–Pb–S–) n network structures. Furthermore, both KGF‐34(C6) and KGF‐59(C6) exhibit multiple phase transitions, including melting and liquid crystalline formation, enabling the fabrication of optoelectronic devices via melt processing. Notably, this is the first report of meltable semiconducting CPs comprising benzenethiol‐derived ligands. These findings offer a rational design strategy for developing melt‐processable semiconductive materials based on metal–benzenethiolate CPs.

  11. Photoinduced reversible assembly of polynuclear complexes from Ru-containing ionic liquids with accompanying ionic conductivity modulations

    Haruka Koshino, Masato Shimada, Hiroki Yamada, Kanta Takiishi, Miki Inada, Zi Lang Goo, Kunihisa Sugimoto, Tomoyuki Mochida

    Inorganic Chemistry Frontiers　2026

    DOI： 10.1039/D5QI02318A 　

  12. In-situ total X-ray scattering reveals the structural evolution of SrIrO3 during the oxygen evolution reaction

    Kentaro Kobayashi, Satoshi Hiroi, Koji Ohara, Neha Thakur, Mukesh Kumar, Weijie Cao, Kengo Nakada, Jo-Chi Tseng, Hiroki Yamada, Seiya Shimono, Yu-Cheng Shao, Hirofumi Ishii, Yoshiharu Uchimoto

    Scientific Reports　2025/12/11

    DOI： 10.1038/s41598-025-31418-y 　

    ISSN： 2045-2322

  13. Ultrafast Encapsulation of Bimetallic Nanoclusters into Zeolites: Linking Structural Features to Catalytic Performance

    Tao Yu, Kai Jia, Zhenyuan Zhao, Jie Zhu, Yuki Sada, Hiroki Yamada, Toshiaki Ina, Kaiqi Nie, Mingyuan Shao, Yihao Zhao, Yundong Wang, Haijun Yang, Binhang Yan, Xiao Chen, Jianhong Xu, Zhendong Liu

    Journal of the American Chemical Society　2025/11/05

    DOI： 10.1021/jacs.5c15231 　

  14. Focused Thermal Energy at Atomic Microwave Antenna Sites for Eco-catalysis

    Toshiaki Ina, Kazuhiro Takanabe, Hiroki Yamada, Akira Nakayama, Hiroki Taniguchi, Toru Wakihara, Tatsushi Yoshioka, Koki Muraoka, Fuminao Kishimoto, Ryo Ishibashi

    Science Advances　2025/10/10

    DOI： 10.1126/sciadv.ady4043 　

  15. Amorphous MoS3 Derived from (NH4)2MoS4: Structural Insights and Applications in All-Solid-State Batteries

    Keitaro Imai, Raku Kato, Tatsuki Shigedomi, Masato Torii, Tomohiro Furukawa, Hiroki Yamada, Kota Motohashi, Atsushi Sakuda, Akitoshi Hayashi

    Inorganic Chemistry　2025/09/22

    DOI： 10.1021/acs.inorgchem.5c03122 　

  16. Metal–Organic Crystallized Glasses: Microstructure Formation and Their Properties

    Soracha Kosasang, Nattapol Ma, David L. Christensen, Morten M. Smedskjaer, Hiroki Yamada, Satoshi Horike

    Journal of the American Chemical Society　2025/09/17

    DOI： 10.1021/jacs.5c10513 　

  17. Liquid Coordination Polymers with Anhydrous Proton Conductivity

    Nattapol Ma, Soracha Kosasang, Satoshi Horike, Hiroki Yamada

    Angewandte Chemie　2025/07/21

    DOI： 10.1002/ange.202504618 　

  18. Liquid Coordination Polymers with Anhydrous Proton Conductivity

    Nattapol Ma, Soracha Kosasang, Satoshi Horike, Hiroki Yamada

    Angewandte Chemie International Edition　2025/07/21

    DOI： 10.1002/anie.202504618 　

  19. Impact of Temperature on Zeolitization Elucidated by In Situ High-Energy X-ray Total Scattering Measurement

    Zimu Zhou, Peidong Hu, Hiroki Yamada, Jo-Chi Tseng, Koji Ohara, Yasuo Yonezawa, Tatsuya Okubo, Toru Wakihara

    Journal of the American Chemical Society　2025/07/16

    DOI： 10.1021/jacs.5c02078 　

  20. Direct Visualization of the Dealumination Process on Zeolite Y: How Was the Mesoporous Architecture Formed?

    Yoshihiro Kamimura, Tetsuya Kodaira, Hiroki Yamada, Norihito Hiyoshi, Akira Endo

    Chemistry of Materials　2025/04/22

    DOI： 10.1021/acs.chemmater.4c03233 　

  21. Chirality and Polarity Modulation in Semiconductive Zinc(II) Coordination Polymers Containing Thiolate-Based Ligands

    Shion Tsujimura, Ryohei Akiyoshi, Akinori Saeki, Nobuto Yoshinari, Daichi Eguchi, Naoto Tamai, Hiroki Yamada, Seiya Shimono, Yuiga Nakamura, Kazuyoshi Ogasawara, Daisuke Tanaka

    Inorganic Chemistry　2025/03/24

    DOI： 10.1021/acs.inorgchem.5c00577 　

    ISSN： 0020-1669 1520-510X

  22. Direct observation of the topological pruning in silica glass network; the key for realizing extreme transparency

    Madoka Ono, Yasuhito Tanabe, Masaya Fujioka, Hiroki Yamada, Koji Ohara, Shinji Kohara, Masanori Fujinami, Junji Nishii

    NPG Asia Materials　2025/02/21

    DOI： 10.1038/s41427-025-00589-5 　

    ISSN： 1884-4057

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    <jats:title>Abstract</jats:title> <jats:p>The optical transparency of silica glass significantly improves when subjected to compression at its melting temperature. Using a rare hydrostatic iso-pressure apparatus capable of reaching 0.98 GPa at 1800 °C with Ar gas as the pressure medium, we obtained centimeter-sized glass samples, allowing us to measure various properties. Both the density and refractive index increased with pressure, while the refractive index dispersion decreased monotonically. However, Rayleigh scattering intensity, and small ring structures show a minimum around 0.8 GPa. High-energy X-ray scattering analysis indicates that the short-range structure, around 4 Å, governs the monotonic trends in the averaged physical properties, such as density and refractive index. In contrast, non-monotonic changes are observed with the disappearance of intermediate-range order at around 8 Å. This simplification of structural ordering is crucial for achieving extreme transparency in silica glass. The effect of suppression of the 8 Å order is well explained by the predicted topological pruning phenomenon, where large voids and small unstable ring structures vanish, leading to the minimal light scattering under high pressure. Our experimental findings also reveal that the optimal pressure for achieving this transparency is much lower than previously predicted, which makes the process more feasible for mass-production applications.</jats:p>

  23. Extracting accurate PDF data from in situ environment of materials using X-ray diffractometer

    Yuji Shiramata, Takayuki Konya, Kentaro Kobayashi, Yui Ishii, Satoshi Hiroi, Hiroki Yamada, Koji Ohara

    Analytical Sciences　2025/02/13

    DOI： 10.1007/s44211-025-00728-6 　

    ISSN： 0910-6340 1348-2246

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    <jats:title>Abstract</jats:title> <jats:p>Pair distribution function (PDF) analysis is a technique traditionally used at synchrotron radiation facilities, but it is now possible to obtain adequate measurements using laboratory-based equipment as well. In addition, cryo-furnaces that enable in situ measurements while controlling temperature have been well established for some time. PDF analysis requires data from a wide range of reciprocal space, along with measurements at short wavelengths. However, the development of time-resolved PDF measurements, which can be captured within a short time span, has also made significant progress. In this study, we demonstrate the reliability of PDF measurements using laboratory equipment and perform a local structure analysis of materials exhibiting an interesting structural phase transition in LaCu<jats:sub>6-<jats:italic>x</jats:italic> </jats:sub>Ag<jats:sub> <jats:italic>x</jats:italic> </jats:sub> through temperature-dependent in situ PDF analysis. By comparing these results with those obtained from synchrotron sources, we provide further validation of the laboratory-based measurements. Our results confirm that in situ PDF measurements obtained with laboratory-based equipment are reliable and effective for studying structural disorder in various materials.</jats:p> <jats:p> <jats:bold>Graphical abstract</jats:bold> </jats:p>

  24. Local structure of amorphous sulfur in carbon–sulfur composites for all-solid-state lithium-sulfur batteries

    Hiroshi Yamaguchi, Yu Ishihara, Yamato Haniu, Atsushi Sakuda, Akitoshi Hayashi, Kentaro Kobayashi, Satoshi Hiroi, Hiroki Yamada, Jo-chi Tseng, Seiya Shimono, Koji Ohara

    Communications Chemistry　8　(1)　2025/01/14

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s42004-025-01408-2 　

    ISSN： 2399-3669

    eISSN： 2399-3669

  25. Thermal conversion of metal hydroxide acrylate nanoparticles immobilized on TiO2 toward noble-metal-free photocatalytic H2 production

    Naoki Tarutani, Rei Nitomakida, Kiyofumi Katagiri, Kei Inumaru, Sayako Inoué, Hiroki Yamada, Toshiaki Ina, Yousuke Ooyama

    Nanoscale　2025

    DOI： 10.1039/D5NR02166A 　

  26. Conversion of CO2 into porous metal–organic framework monoliths

    Kanchana Sotho, Kentaro Kadota, Takuya Kurihara, Thanakorn Tiyawarakul, Hiroki Yamada, Kanokwan Kongpatpanich, Satoshi Horike

    Journal of Materials Chemistry A　2025

    DOI： 10.1039/d4ta08744e 　

    ISSN： 2050-7488 2050-7496

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    <jats:p>We demonstrate the one-pot conversion of CO<jats:sub>2</jats:sub> into amorphous formate-based metal–organic frameworks (MOFs) that form grain-boundary-free monoliths with permanent porosity through hot-pressing.</jats:p>

  27. 3D printed porous nickel-cobalt oxide objects synthesized by interconnection and thermal conversion of metal hydroxide acrylate nanoparticles

    Yudai Inada, Naoki Tarutani, Miki Asanome, Sota Shimizu, Yasuaki Tokudome, Hiroki Yamada, Toshiaki Ina, Seiya Shimono, Kiyofumi Katagiri, Kei Inumaru

    Journal of the Ceramic Society of Japan　2025

    DOI： 10.2109/jcersj2.25091 　

    ISSN： 1348-6535 1882-0743

  28. Influence of alkali metal cations on the local structure of amorphous precursors during zeolite crystallization

    Kazuki Mori, Peidong Hu, Kentaro Kobayashi, Hiroki Yamada, Koji Ohara, Yutaka Yanaba, Tatsuya Okubo, TORU WAKIHARA

    Physical Chemistry Chemical Physics　2025

    DOI： 10.1039/d5cp01233c 　

    ISSN： 1463-9076 1463-9084

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    <jats:p>Na<jats:sup>+</jats:sup> and K<jats:sup>+</jats:sup> govern the local structures of amorphous precursors of zeolites, resulting in the formation of different zeolites with similar structural characteristics to those of their precursors.</jats:p>

  29. Novel preparation of amorphous aluminosilicates via amorphous borosilicates by B-to-Al exchange

    Yuki Sada, Shoko Miyagi, Raquel Simancas, Masato Yoshioka, Tomoya Ishikawa, Keita Nakao, Yusuke Naraki, Hiroki Yamada, Seiya Shimono, Koji Ohara, Tsuneji Sano, Tatsuya Okubo, Toru Wakihara

    Microporous and Mesoporous Materials　113529-113529　2025/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.micromeso.2025.113529 　

    ISSN： 1387-1811

  30. Unraveling the relationship between aging conditions, properties of amorphous precursors and CHA-type zeolite crystallization

    Yukie Okada, Yuki Sada, Shoko Miyagi, Hiroki Yamada, Koji Ohara, Yutaka Yanaba, Masato Yoshioka, Tomoya Ishikawa, Yusuke Naraki, Tsuneji Sano, Tatsuya Okubo, Raquel Simancas, Toru Wakihara

    Microporous and Mesoporous Materials　2025/01

    DOI： 10.1016/j.micromeso.2024.113099 　

  31. Iron redox effect on the structure and viscosity of a sodium silicate glass and melt

    Sohei Sukenaga, Maria Rita Cicconi, Hiroki Yamada, Toru Wakihara, Koji Ohara, Hiroyuki Shibata, Daniel R. Neuville

    The Journal of Chemical Physics　2024/12/28

    DOI： 10.1063/5.0243427 　

  32. Interpenetrated Metal–Organic Framework Glass

    Cheng Luo, Yong-Sheng Wei, Zeyu Fan, Ellan K. Berdichevsky, Taichi Nishiguchi, Haoyang Shi, Siquan Zhang, Yusuke Nishiyama, Hiroki Yamada, Satoshi Horike

    Chemistry of Materials　2024/10/08

    DOI： 10.1021/acs.chemmater.4c01912 　

  33. Platinum‐Group Metal High‐Entropy Selenides for the Hydrogen Evolution Reaction

    Xiaohui Deng, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Jo-Chi Tseng, Hiroki Yamada, Osami Sakata, Hirotaka Ashitani, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Angewandte Chemie International Edition　2024/09/18

    DOI： 10.1002/anie.202414786 　

    ISSN： 1433-7851 1521-3773

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    <jats:p>The selenides of platinum‐group metals (PGMs) are emerging as promising catalysts for diverse electrochemical reactions. To date, most studies have focused on single metal or bimetallic systems, whereas the preparation of a high‐entropy (HE) selenide consisting of five or more PGM elements holds the promise to further enhance catalytic performance by introducing abundant active sites with various local coordination environments and electronic structures. Herein, we report for the first time the synthesis of PGM‐based HE‐Selenide (HE‐Se) nanoparticles with a unique amorphous structure. The atomic metal–Se coordination and the presence of short‐range order were thoroughly revealed. It is further shown that the amorphous HE‐Se can be facilely transformed into a single‐phase crystalline HE‐Se with a cubic structure by thermal annealing. Catalytically, the amorphous HE‐Se showed better acidic hydrogen evolution activity over monometallic PGM‐based selenides and the crystalline counterpart, demonstrating the advantages of high‐entropy configuration and amorphous structure. Our findings may pave the way toward the synthesis and property exploration of amorphous PGM‐based selenides with tunable compositions.</jats:p>

  34. Lead(II)-Based Coordination Polymer Exhibiting Reversible Color Switching and Selective CO2 Photoreduction Properties

    Chomponoot Suppaso, Ryohei Akiyoshi, Hiroki Yamada, Yoshinobu Kamakura, Fumitaka Ishiwari, Kazuyoshi Ogasawara, Akinori Saeki, Daisuke Tanaka, Kazuhiko Maeda

    Inorganic Chemistry　2024/07/22

    DOI： 10.1021/acs.inorgchem.4c01883 　

  35. Prussian Blue Analogue Glasses for Photoinduced CO2 Conversion

    Soracha Kosasang, Nattapol Ma, Sarawoot Impeng, Sareeya Bureekaew, Yuji Namiki, Masahiko Tsujimoto, Taya Saothayanun, Hiroki Yamada, Satoshi Horike

    Journal of the American Chemical Society　2024/07/03

    DOI： 10.1021/jacs.4c03149 　

  36. 放射光X線を用いた二体分布関数解析の現状と金属材料への展開

    Hiroki Yamada

    Materia Japan　2024/07/01

    DOI： 10.2320/materia.63.452 　

    ISSN： 1340-2625 1884-5843

  37. High-throughput and high-resolution powder X-ray diffractometer consisting of six sets of 2D CdTe detectors with variable sample-to-detector distance and innovative automation system

    Shogo Kawaguchi, Shintaro Kobayashi, Hiroki Yamada, Hirotaka Ashitani, Michitaka Takemoto, Yasuhiko Imai, Takaki Hatsui, Kunihisa Sugimoto, Osami Sakata

    Journal of Synchrotron Radiation　2024/07/01

    DOI： 10.1107/S1600577524003539 　

  38. Controlling Ionic Conductivity in Organometallic Ionic Liquids through Light-Induced Coordination Polymer Formation and Thermal Reversion

    Tomoyuki Mochida, Masato Shimada, Ryota Inoue, Ryo Sumitani, Yusuke Funasako, Hiroki Yamada

    The Journal of Physical Chemistry B　2024/06/27

    DOI： 10.1021/acs.jpcb.4c02150 　

  39. Improving mechanical stability of ZSM-5 zeolite by defect-healing treatment

    Masanori Takemoto, Yuka Yoshihara, Yoshiaki Ito, Hiroki Yamada, Kenta Iyoki, Tatsuya Okubo, Toru Wakihara

    Microporous and Mesoporous Materials　2024/05

    DOI： 10.1016/j.micromeso.2024.113087 　

  40. Submicron titania pattern fabrication via thermal nanoimprint printing and microstructural analysis of printable titania gels

    Daisuke Hirose, Hiroki Yamada, Tseng Jochi, Koji Ohara, Yuzuru Takamura

    Ceramics International　2024/05

    DOI： 10.1016/j.ceramint.2024.01.353 　

  41. In situ structural characterization of Li3PS4 solid electrolytes under high pressure

    Atsushi Yao, Shogo Kadota, Satoshi Hiroi, Hiroki Yamada, Jo-chi Tseng, Seiya Shimono, Futoshi Utsuno, Koji Ohara

    Journal of Solid State Electrochemistry　2024/04/15

    DOI： 10.1007/s10008-024-05889-4 　

    ISSN： 1432-8488 1433-0768

  42. Formation process of halogen-rich argyrodite: elemental disordering of atomic arrangement at the 4a and 4d sites in a heat treatment

    Hiroshi Yamaguchi, Atsushi Yao, Satoshi Hiroi, Hiroki Yamada, Jo-chi Tseng, Seiya Shimono, Futoshi Utsuno, Koji Ohara

    Journal of Solid State Electrochemistry　2024/04/05

    DOI： 10.1007/s10008-024-05881-y 　

    ISSN： 1432-8488 1433-0768

  43. Structural Analysis of Lithium Ion Transport Environment in Sulfide-Based Crystallized Glass Solid Electrolyte Using Synchrotron X-Ray Diffraction

    Koji Ohara, Hiroki Yamada, Satoshi Hiroi, Atsushi Sakuda, Akitoshi Hayashi

    The Materials Research Society Series　2024

    DOI： 10.1007/978-981-97-6039-8_22 　

    ISSN： 2730-7360 2730-7379

  44. イオン伝導ガラス中のリチウムイオン輸送環境の解明

    Hiroki Yamada

    クリーンエネルギー　(33)　41-50　2024/01

  45. Revealing the evolution of local structures in the formation process of alkaline earth metal cation-containing zeolites from glasses

    Peidong Hu, Makiko Deguchi, Hiroki Yamada, Kentaro Kobayashi, Koji Ohara, Sohei Sukenaga, Mariko Ando, Hiroyuki Shibata, Akihiko Machida, Yutaka Yanaba, Zhendong Liu, Tatsuya Okubo, TORU WAKIHARA

    Physical Chemistry Chemical Physics　2024

    DOI： 10.1039/d3cp04954j 　

    ISSN： 1463-9076 1463-9084

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    <jats:p>Pure harmotome was synthesized from a Ba-containing aluminosilicate glass. The structure-regulating role of Ba<jats:sup>2+</jats:sup> and the transformation scheme were revealed by combining high-energy X-ray total scattering and anomalous X-ray scattering techniques.</jats:p>

  46. Mechanism of Al Coordination Change in Alkaline-earth Aluminosilicate Glasses: An Application of Bond Valence Model

    Sohei Sukenaga, Koji Kanehashi, Hiroki Yamada, Koji Ohara, Toru Wakihara, Hiroyuki Shibata

    Tetsu-to-Hagane　109　(11)　934-939　2023/11/01

    Publisher: Iron and Steel Institute of Japan

    DOI： 10.2355/tetsutohagane.tetsu-2023-056 　

    ISSN： 0021-1575

    eISSN： 1883-2954

  47. 高エネルギーX線全散乱測定データと機械学習ポテンシャルを組み合わせた逆モンテカルロ法による非晶質構造解析

    Hiroki Yamada

    セラミックス　58　(10)　668-671　2023/10/01

  48. Direct microwave energy input on a single cation for outstanding selective catalysis

    Fuminao Kishimoto, Tatsushi Yoshioka, Ryo Ishibashi, Hiroki Yamada, Koki Muraoka, Hiroki Taniguchi, Toru Wakihara, Kazuhiro Takanabe

    Science Advances　2023/08/18

    DOI： 10.1126/sciadv.adi1744 　

  49. In situ high temperature powder x-ray diffraction technique using a sapphire single-crystal flat cell

    S. Kobayashi, S. Kawaguchi, H. Yamada

    Review of Scientific Instruments　2023/08/01

    DOI： 10.1063/5.0150091 　

  50. Heterogenous CO2 Reduction Photocatalysis of Transparent Coordination Polymer Glass Membranes Containing Metalloporphyrins

    Hitoshi Izu, Hiroyasu Tabe, Yuji Namiki, Hiroki Yamada, Satoshi Horike

    Inorganic Chemistry　2023/07/24

    DOI： 10.1021/acs.inorgchem.3c00700 　

  51. Atomic Structure of Mn-Doped CoFe2O4 Nanoparticles for Metal–Air Battery Applications

    Katariina Pussi, Keying Ding, Bernardo Barbiellini, Koji Ohara, Hiroki Yamada, Chuka Onuh, James McBride, Arun Bansil, Ray K. Chiang, SAEED KAMALI MOGHADDAM

    Condensed Matter　2023/05/24

    DOI： 10.3390/condmat8020049 　

  52. Formation of Porosity toward Acetylene upon Vitrification of Non-porous Photochromic Coordination Polymer Crystals

    Zeyu Fan, Yong-Sheng Wei, Hiroyasu Tabe, Tomotaka Nakatani, Chinmoy Das, Hiroki Yamada, Satoshi Horike

    Chemistry of Materials　2023/05/23

    DOI： 10.1021/acs.chemmater.2c03510 　

  53. Atom-Selective Analyses Reveal the Structure-Directing Effect of Cs Cation on the Synthesis of Zeolites

    Hiroki Yamada, Hirofumi Horikawa, Chokkalingam Anand, Koji Ohara, Toshiaki Ina, Akihiko Machida, Satoshi Tominaka, Tatsuya Okubo, Zhendong Liu, Kenta Iyoki, Toru Wakihara

    The Journal of Physical Chemistry Letters　2023/04/13

    DOI： 10.1021/acs.jpclett.3c00432 　

  54. Lithium Ion Transport Environment by Molecular Vibrations in Ion‐Conducting Glasses

    Hiroki Yamada, Koji Ohara, Satoshi Hiroi, Atsushi Sakuda, Kazutaka IKEDA, Takahiro Ohkubo, Kengo Nakada, Hirofumi Tsukasaki, Hiroshi Nakajima, László Temleitner, Laszlo Pusztai, Shunsuke Ariga, Aoto Matsuo, Jiong Ding, Takumi Nakano, Takuya Kimura, Ryo KOBAYASHI, Takeshi Usuki, Shuta Tahara, Koji Amezawa, Yoshitaka Tateyama, Shigeo Mori, Akitoshi Hayashi

    ENERGY &amp; ENVIRONMENTAL MATERIALS　2023/03/31

    Publisher: Wiley

    DOI： 10.1002/eem2.12612 　

    ISSN： 2575-0356

  55. Creating glassy states of dicarboxylate-bridged coordination polymers

    Zeyu FAN, Yong-Sheng Wei, Chinmoy Das, Kazuyoshi Kanamori, Hiroki Yamada, Koji Ohara, Satoshi Horike

    Chemical Communications　2023

    DOI： 10.1039/d3cc04518h 　

    ISSN： 1359-7345 1364-548X

    More details Close

    <jats:p>A series of dicarboxylate-bridged networked glasses with tunable porosity and mechanical properties were obtained by dehydration of hydrated coordination polymer crystals.</jats:p>

  56. Mechanism of Al coordination change in alkaline-earth aluminosilicate glasses: An application of bond valence model

    Sohei Sukenaga, Koji Kanehashi, Hiroki Yamada, Koji Ohara, Toru Wakihara, Hiroyuki Shibata

    ISIJ International　63　(7)　1263-1266　2023

    Publisher: Iron and Steel Institute of Japan

    DOI： 10.2355/isijinternational.isijint-2022-398 　

    ISSN： 0915-1559

    eISSN： 1347-5460

  57. Tracking Sub-Nano-Scale Structural Evolution in Zeolite Synthesis by In Situ High-Energy X-ray Total Scattering Measurement with Pair Distribution Function Analysis

    Ayano Minami, Peidong Hu, Yuki Sada, Hiroki Yamada, Koji Ohara, Yasuo Yonezawa, Yukichi Sasaki, Yutaka Yanaba, Masanori Takemoto, Yuki Yoshida, Tatsuya Okubo, TORU WAKIHARA

    Journal of the American Chemical Society　144　(51)　23313-23320　2022/12/28

    Publisher: American Chemical Society ({ACS})

    DOI： 10.1021/jacs.2c05722 　

    ISSN： 0002-7863 1520-5126

    eISSN： 1520-5126

  58. Elucidation of the Crystallization Mechanism of Zeolites by using Pair Distribution Function Analysis

    Hiroki YAMADA, Ching-Tien CHEN, Kenta IYOKI, Tatsuya OKUBO, Toru WAKIHARA

    Nihon Kessho Gakkaishi　64　(3)　219-224　2022/08/31

    Publisher: The Crystallographic Society of Japan

    DOI： 10.5940/jcrsj.64.219 　

    ISSN： 0369-4585 1884-5576

  59. Atomic structure of an FeCrMoCBY metallic glass revealed by high energy x-ray diffraction

    Katariina Pussi, D V Louzguine-Luzgin, J Nokelaineni, Bernardo Barbiellini, Veenavee Kothalawala, K Ohara, H Yamada, A Bansil, SAEED KAMALI MOGHADDAM

    Journal of Physics: Condensed Matter　2022/07/13

    DOI： 10.1088/1361-648x/ac6a9a 　

    ISSN： 0953-8984 1361-648X

    More details Close

    <jats:title>Abstract</jats:title> <jats:p>Amorphous bulk metallic glasses with the composition Fe<jats:sub>48</jats:sub>Cr<jats:sub>15</jats:sub>Mo<jats:sub>14</jats:sub>C<jats:sub>15</jats:sub>B<jats:sub>6</jats:sub>Y<jats:sub>2</jats:sub> have been of interest due to their special mechanical and electronic properties, including corrosion resistance, high yield-strength, large elasticity, catalytic performance, and soft ferromagnetism. Here, we apply a reverse Monte Carlo technique to unravel the atomic structure of these glasses. The pair-distribution functions for various atomic pairs are computed based on the high-energy x-ray diffraction data we have taken from an amorphous sample. Monte Carlo cycles are used to move the atomic positions until the model reproduces the experimental pair-distribution function. The resulting fitted model is consistent with our <jats:italic>ab initio</jats:italic> simulations of the metallic glass. Our study contributes to the understanding of functional properties of Fe-based bulk metallic glasses driven by disorder effects.</jats:p>

  60. Dealumination of small-pore zeolites through pore-opening migration process with the aid of pore-filler stabilization Peer-reviewed

    Tatsushi Yoshioka, Kenta Iyoki, Yuusuke Hotta, Yoshihiro Kamimura, Hiroki Yamada, Qiao Han, Takeharu Kato, Craig A. J. Fisher, Zhendong Liu, Ryohji Ohnishi, Yutaka Yanaba, Koji Ohara, Yukichi Sasaki, Akira Endo, Takahiko Takewaki, Tsuneji Sano, Tatsuya Okubo, Toru Wakihara

    Science Advances　8　(25)　2022/06/24

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/sciadv.abo3093 　

    ISSN： 2375-2548

    eISSN： 2375-2548

  61. Fully automated measurement system for temperature-dependent X-ray total scattering at beamline BL04B2 at SPring-8

    Hiroki Yamada, Kengo Nakada, Michitaka Takemoto, Koji Ohara

    Journal of Synchrotron Radiation　29　2022/03/01

    DOI： 10.1107/S1600577521013527 　

    ISSN： 1600-5775 0909-0495

  62. Structural Properties of Nanometer-Sized Gold Nanoparticles on a Silicon Substrate

    Pussi, K., Barbiellini, B., Ohara, K., Yamada, H., Carbo-Argibay, E., Sousa, V., Kolen{'}ko, Y.V., Bansil, A., Kamali, S.

    Physica Status Solidi (B) Basic Research　2022

    DOI： 10.1002/pssb.202100572 　

    ISSN： 1521-3951 0370-1972

  63. Revealing scenarios of interzeolite conversion from FAU to AEI through the variation of starting materials

    Liu, Z., Chokkalingam, A., Miyagi, S., Yoshioka, M., Ishikawa, T., Yamada, H., Ohara, K., Tsunoji, N., Naraki, Y., Sano, T., Okubo, T., Wakihara, T.

    Physical Chemistry Chemical Physics　24　(7)　2022

    DOI： 10.1039/d1cp03751j 　

    ISSN： 1463-9076

  64. Experimental evidence of tetrahedral symmetry breaking in SiO2 glass under pressure

    Kono, Y., Ohara, K., Kondo, N.M., Yamada, H., Hiroi, S., Noritake, F., Nitta, K., Sekizawa, O., Higo, Y., Tange, Y., Yumoto, H., Koyama, T., Yamazaki, H., Senba, Y., Ohashi, H., Goto, S., Inoue, I., Hayashi, Y., Tamasaku, K., Osaka, T., Yamada, J., Yabashi, M.

    Nature Communications　13　(1)　2022

    DOI： 10.1038/s41467-022-30028-w 　

    ISSN： 2041-1723

  65. Binary dopant segregation enables hematite-based heterostructures for highly efficient solar H2O2 synthesis

    Zhang, Z., Tsuchimochi, T., Ina, T., Kumabe, Y., Muto, S., Ohara, K., Yamada, H., Ten-no, S.L., Tachikawa, T.

    Nature Communications　13　(1)　2022

    DOI： 10.1038/s41467-022-28944-y 　

    ISSN： 2041-1723

  66. Thermal Conductivity of Sodium Silicate Glasses and Melts: Contribution of Diffusive and Propagative Vibration Modes

    Sohei Sukenaga, Takahiko Endo, Tsuyoshi Nishi, Hiroki Yamada, Koji Ohara, Toru Wakihara, Koji Inoue, Sakiko Kawanishi, Hiromichi Ohta, Hiroyuki Shibata

    Frontiers in Materials　8　2021/11/01

    DOI： 10.3389/fmats.2021.753746 　

    ISSN： 2296-8016

    eISSN： 2296-8016

  67. Reaction Kinetics Regulated Formation of Short-Range Order in an Amorphous Matrix during Zeolite Crystallization

    Ching-Tien Chen, Kenta Iyoki, Peidong Hu, Hiroki Yamada, Koji Ohara, Sohei Sukenaga, Mariko Ando, Hiroyuki Shibata, Tatsuya Okubo, Toru Wakihara

    Journal of the American Chemical Society　143　(29)　10986-10997　2021/07/28

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/jacs.1c03351 　

    ISSN： 0002-7863

    eISSN： 1520-5126

  68. Reconsideration of Viscosity Variation Mechanism in Calcium Ferrite Melt During Isothermal Melting Process

    Sohei Sukenaga, Koji Ohara, Hiroki Yamada, Toru Wakihara, Hiroyuki Shibata

    Metallurgical and Materials Transactions B　52　(4)　2021/06/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s11663-021-02227-1 　

    ISSN： 1073-5615

    eISSN： 1543-1916

  69. Tracking the crystallization behavior of high-silica FAU during AEI-type zeolite synthesis using acid treated FAU-type zeolite

    Sada, Y., Chokkalingam, A., Iyoki, K., Yoshioka, M., Ishikawa, T., Naraki, Y., Yanaba, Y., Yamada, H., Ohara, K., Sano, T., Okubo, T., Liu, Z., Wakihara, T.

    RSC Advances　11　(37)　2021

    DOI： 10.1039/d1ra03150c 　

    ISSN： 2046-2069

  70. Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

    Pussi, K., Barbiellini, B., Ohara, K., Yamada, H., Dwivedi, J., Bansil, A., Gupta, A., Kamali, S.

    Journal of Physics Condensed Matter　33　(39)　2021

    DOI： 10.1088/1361-648X/ac1238 　

    ISSN： 1361-648X 0953-8984

  71. Engineering Mesopore Formation in Hierarchical Zeolites under High Hydrostatic Pressure

    Sato, R., Liu, Z., Peng, C., Tan, C., Hu, P., Zhu, J., Takemura, M., Yonezawa, Y., Yamada, H., Endo, A., Garci{\'a}-Mart{\'i}nez, J., Okubo, T., Wakihara, T.

    Chemistry of Materials　33　(21)　2021

    DOI： 10.1021/acs.chemmater.1c02800 　

    ISSN： 1520-5002 0897-4756

  72. Observation of Liquid Phase Synthesis of Sulfide Solid Electrolytes Using Time-Resolved Pair Distribution Function Analysis

    Koji Ohara, Naoya Masuda, Hiroshi Yamaguchi, Atsushi Yao, Satoshi Tominaka, Hiroki Yamada, Satoshi Hiroi, Masakuni Takahashi, Kentaro Yamamoto, Toru Wakihara, Yoshiharu Uchimoto, Futoshi Utsuno, Shigeru Kimura

    PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS　257　(11)　2020/11

    DOI： 10.1002/pssb.202000106 　

    ISSN： 0370-1972

    eISSN： 1521-3951

  73. Synthesis and characterization of MFI-type zincosilicate zeolites with high zinc content using mechanochemically treated Si-Zn oxide composite

    Peidong Hu, Kenta Iyoki, Hiroki Yamada, Yutaka Yanaba, Koji Ohara, Naonobu Katada, Toru Wakihara

    MICROPOROUS AND MESOPOROUS MATERIALS　288　2019/11

    DOI： 10.1016/j.micromeso.2019.109594 　

    ISSN： 1387-1811

    eISSN： 1873-3093

  74. Structural Evolution of Amorphous Precursors toward Crystalline Zeolites Visualized by an in Situ X-ray Pair Distribution Function Approach

    Hiroki Yamada, Satoshi Tominaka, Koji Ohara, Zhendong Liu, Tatsuya Okubo, Toru Wakihara

    JOURNAL OF PHYSICAL CHEMISTRY C　123　(46)　28419-28426　2019/11

    DOI： 10.1021/acs.jpcc.9b07232 　

    ISSN： 1932-7447

    eISSN： 1932-7455

  75. Zeolite Crystallization Triggered by Intermediate Stirring

    Ching-Tien Chen, Kenta Iyoki, Hiroki Yamada, Sohei Sukenaga, Mariko Ando, Hiroyuki Shibata, Koji Ohara, Toni Wakihara, Tatsuya Okubo

    JOURNAL OF PHYSICAL CHEMISTRY C　123　(33)　20304-20313　2019/08

    DOI： 10.1021/acs.jpcc.9b04778 　

    ISSN： 1932-7447

    eISSN： 1932-7455

  76. Identifying the Factors Governing the Early-Stage Degradation of Cu-Chabazite Zeolite for NH3-SCR

    Toyohiro Usui, Zhendong Liu, Hirokazu Igarashi, Yukichi Sasaki, Yuji Shiramata, Hiroki Yamada, Koji Ohara, Tetsuro Kusamoto, Toru Wakihara

    ACS OMEGA　4　(2)　3653-3659　2019/02

    DOI： 10.1021/acsomega.8b03409 　

    ISSN： 2470-1343

  77. Time-resolved pair distribution function analysis ofdisordered materials on beamlines BL04B2 and BL08W at SPring-8

    Koji Ohara, Satoshi Tominaka, Hiroki Yamada, Masakuni Takahashi, Hiroshi Yamaguchi, Futoshi Utsuno, Takashi Umeki, Atsushi Yao, Kengo Nakada, Michitaka Takemoto, Satoshi Hiroi, Naruki Tsuji, Toru Wakihara

    JOURNAL OF SYNCHROTRON RADIATION　25　1627-1633　2018/11

    DOI： 10.1107/S1600577518011232 　

    ISSN： 1600-5775

  78. Comparative study of aluminosilicate glass and zeolite precursors in terms of Na environment and network structure

    Hiroki Yamada, Sohei Sukenaga, Koji Ohara, Chokkalingam Anand, Mariko Ando, Hiroyuki Shibata, Tatsuya Okubo, Toru Wakihara

    MICROPOROUS AND MESOPOROUS MATERIALS　271　33-40　2018/11

    DOI： 10.1016/j.micromeso.2018.05.006 　

    ISSN： 1387-1811

    eISSN： 1873-3093

  79. A 3D Organically Synthesized Porous Carbon Material for Lithium-Ion Batteries

    Ziqiang Zhao, Saikat Das, Guolong Xing, Pierre Fayon, Patrick Heasman, Michael Jay, Steven Bailey, Colin Lambert, Hiroki Yamada, Toru Wakihara, Abbie Trewin, Teng Ben, Shilun Qiu, Valentin Valtchev

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION　57　(37)　11952-11956　2018/09

    DOI： 10.1002/anie.201805924 　

    ISSN： 1433-7851

    eISSN： 1521-3773

  80. Formation of a dense non-crystalline layer on the surface of zeolite Y crystals under high-temperature steaming conditions

    Kenta Iyoki, Yudai Yamaguchi, Akira Endo, Yasuo Yonezawa, Tadashi Umeda, Hiroki Yamada, Yutaka Yanaba, Takeshi Yoshikawa, Koji Ohara, Kaname Yoshida, Yukichi Sasaki, Tatsuya Okubo, Toru Wakihara

    MICROPOROUS AND MESOPOROUS MATERIALS　268　77-83　2018/09

    DOI： 10.1016/j.micromeso.2018.04.021 　

    ISSN： 1387-1811

    eISSN： 1873-3093

  81. Lepidocrocite-Type Titanate Formation from Isostructural Prestructures under Hydrothermal Reactions: Observation by Synchrotron X-ray Total Scattering Analyses

    Satoshi Tominaka, Hiroki Yamada, Satoshi Hiroi, Saori I. Kawaguchi, Koji Ohara

    ACS OMEGA　3　(8)　8874-8881　2018/08

    DOI： 10.1021/acsomega.8b01693 　

    ISSN： 2470-1343

  82. Preparation of nanosized SSZ-13 zeolite with enhanced hydrothermal stability by a two-stage synthetic method

    Ce Peng, Zhendong Liu, Aoki Horimoto, Chokkalingam Anand, Hiroki Yamada, Koji Ohara, Sohei Sukenaga, Mariko Ando, Hiroyuki Shibata, Takahiko Takewaki, Rino R. Mukti, Tatsuya Okubo, Toru Wakihara

    MICROPOROUS AND MESOPOROUS MATERIALS　255　192-199　2018/01

    DOI： 10.1016/j.micromeso.2017.07.042 　

    ISSN： 1387-1811

    eISSN： 1873-3093

  83. Comparative Study on the Different Interaction Pathways between Amorphous Aluminosilicate Species and Organic Structure-Directing Agents Yielding Different Zeolite Phases

    Tadashi Umeda, Hiroki Yamada, Koji Ohara, Kaname Yoshida, Yukichi Sasaki, Miku Takano, Satoshi Inagaki, Yoshihiro Kubota, Takahiko Takewaki, Tatsuya Okubo, Toru Wakihara

    JOURNAL OF PHYSICAL CHEMISTRY C　121　(43)　24324-24334　2017/11

    DOI： 10.1021/acs.jpcc.7b07745 　

    ISSN： 1932-7447

  84. Continuous flow synthesis of ZSM-5 zeolite on the order of seconds

    Zhendong Liu, Kotatsu Okabe, Chokkalingam Anand, Yasuo Yonezawa, Jie Zhu, Hiroki Yamada, Akira Endo, Yutaka Yanaba, Takeshi Yoshikawa, Koji Ohara, Tatsuya Okubo, Toru Wakihara

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　113　(50)　14267-14271　2016/12

    DOI： 10.1073/pnas.1615872113 　

    ISSN： 0027-8424

  85. Downsizing AFX Zeolite Crystals to Nanoscale by a Postmilling Recrystallization Method

    Hiroki Yamada, Takayuki Iida, Zhendong Liu, Yusuke Naraki, Koji Ohara, Shinji Kohara, Tatsuya Okubo, Toru Wakidhara

    CRYSTAL GROWTH & DESIGN　16　(6)　3389-3394　2016/06

    DOI： 10.1021/acs.cgd.6b00365 　

    ISSN： 1528-7483

    eISSN： 1528-7505

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Misc. 7

  1. Submicron patterning of titania by nano-Rheology printing

    廣瀬大亮, 山田大貴, 尾原幸治, TSENG Jochi, 高村禅

    応用物理学会春季学術講演会講演予稿集(CD-ROM)　70th　2023

    ISSN： 2758-4704

  2. Update on the Monochromator at BL04B2, SPring-8

    28　(3)　326-328　2023

  3. 回折・散乱IビームラインBL13XUの現状

    隅谷和嗣, 河口彰吾, 山田大貴, 小林慎太郎, 小金澤智之, ロシャンタ・クマーラ

    SPring-8/SACLA 利用者情報　27　(3)　274-279　2022

  4. 研究機関紹介 Wigner Research Center for Physics 滞在記

    ニューガラス　3　20-22　2022

  5. ゼオライトの精密設計を目的とした非周期系原料及び結晶ゼオライトの原子・ナノスケールPDF解析

    脇原徹, 陳靖天, 山田大貴

    SPring-8/SACLA 利用者情報　26　(3)　256-260　2021

  6. 革新的機能性ゼオライトの設計を目的とした生成メカニズムの時分割原子・ナノスケール解析

    脇原徹, 飯田剛之, 山田大貴

    SPring-8/SACLA 利用者情報　24　(1)　12-17　2019

  7. Pre-symposium of ZMPC2018 参加報告

    山田大貴

    ゼオライト　36　(22)　2018

Show all ︎Show first 5

Books and Other Publications 1

  1. イオン伝導ガラス中のリチウムイオン輸送環境の解明

    山田大貴, 尾原幸治

    日本工業出版　2024/01

Presentations 25

  1. ブラウザ上で高速動作する新しい放射光X線PDF解析のソフトウェア：WebPDFの開発

    山田大貴, 尾原幸治

    第39回日本放射光学会年会・放射光科学合同シンポジウム　2026/01

  2. Elucidation of the crystallization mechanism of zeolite by using X-ray PDF approach Invited

    Hiroki Yamada

    19th Conference of AsCA (AsCA 2025)　2025/12

  3. Observation of Ti state in Zeolites Using High-resolution X-ray Absorption Spectroscopy

    Hiroki Yamada, Boqing Li, Tatsushi Yoshioka, Kengo Nakada, Yuki Sada, Koji Ohara, Masakuni Takahashi, Kotaro Higashi, Seiya Shimono, Toshiaki Ina, Naomi Kawamura, Toru Wakihara

    2025/07

  4. CdTe２次元検出器を使用したBL04B2およびBL08W での高速PDF測定の検討

    山田大貴, Tseng Jochi, 下野聖矢, Orsini Fabienne

    第38回日本放射光学会年会 放射光科学合同シンポジウム　2025/01

  5. BL04B2ビームラインにおけるハイスループットPDF測定

    山田大貴, 下野 聖矢, 河口 彰吾

    令和6年度(2024年度)日本結晶学会年会　2024/11

  6. Determining Ti site in Zeolites Using High-resolution X-ray Absorption Spectroscopy

    Hiroki Yamada, Boqing Li, Tatsushi Yoshioka, Kengo Nakada, Yuki Sada, Koji Ohara, Masakuni Takahashi, Kotaro Higashi, Seiya Shimono, Toshiaki Ina, Naomi Kawamura, Toru, Wakihara

    International Symposium on Zeolites and Microporous Crystals 2024　2024/07

  7. 高エネルギーX 線全散乱測定データと機械学習ポテンシャルを組み合わせた逆モンテカルロ法による非晶質構造解析 Invited

    山田大貴

    ニューガラスセミナー　2024/02

  8. BL04B2におけるハイスループットPDF測定装置の開発

    山田大貴, 下野聖矢, 河口彰吾, Tseng Jochi

    第37回日本放射光学会年会・ 放射光科学合同シンポジウム　2024/01

  9. 高分解能 X 線吸収・発光分光測定によるチタノシリケートゼオライト中のTi状態の解析

    山田大貴, 吉岡達史, Li Boqing, 伊奈稔哲, 河村直巳, 脇原徹

    第39回ゼオライト研究発表会　2023/11

  10. 超セラミックス材料の局所構造解明に資する高エネルギーX線全散乱測定システム及び構造解析手法の開発

    山田大貴, Tseng Jochi, 下野聖矢, 尾原幸治

    第36回日本セラミックス協会秋季シンポジウム　2023/09

  11. 元素選択的な分析によるゼオライト合成中のCsカチオンの構造規定効果の解明

    山田大貴, 堀川裕史, Anand Chokkalingam, 伊奈稔哲, 町田晃彦, 冨中悟史, 大久保達也, 劉振東, 伊與木健太, 脇原徹

    第38回ゼオライト研究発表会　2022/12

  12. 機械学習ポテンシャル・逆モンテカルロ法を組み合わせた固体電解質の構造解析

    山田大貴, Pusztai Laszlo, Temleitner Laszlo, 尾原幸治

    第35回セラミックス協会秋季シンポジウム　2022/09

  13. 量子ビームを用いた非晶質構造解析 Invited

    山田大貴

    複相機能開拓拠点FS講演会　2021/12

  14. PDFによる局所構造解析 Invited

    山田大貴

    日本化学会第101回春季年会　2021/03

  15. In situ 高エネルギーX線全散乱法によるゼオライト合成過程の前駆体形成の観察

    山田大貴, 冨中 悟史, 尾原 幸治, Liu Zhendong, 大久保 達也, 脇原 徹

    第33回セラミックス協会秋季シンポジウム　2020/09

  16. Understanding the Structural Evolution of Amorphous Precursor for *BEA Zeolite around Organic Structure-Directing Agent by Combining X-ray and Neutron Total Scatterings

    Hiroki Yamada, Yohei Onodera, Tadashi Umeda, Koki Muraoka, Koji Ohara, Kazutaka Ikeda, Toshiya Otomo, Marie Shimomura, Akira Endo, Tatsuya Okubo, Zhendong Liu, Toru Wakihara

    19th International Zeolite Conference　2019/07

  17. 高エネルギーX線及び中性子全散乱法を併用した*BEA型ゼオライト非晶質前駆体中における有機構造規定剤周辺の構造形成の解明

    山田大貴, 小野寺陽平, 梅田匡, 村岡恒輝, Chokkalingam Anand, 尾原幸治, 池田一貴, 大友季哉, Liu Zhendong, 大久保達也, 脇原徹

    日本セラミックス協会2019年年会　2019/03

  18. Structural Evolution of Amorphous Precursors towards Zeolites Visualized by in-situ Relative PDF Approach

    Hiroki Yamada, Toru Wakihara

    7th RMC conference　2018/09

  19. 量子ビームを用いたゼオライト結晶化メカニズムの解明 Invited

    山田大貴

    材料化学 システム工学討論会　2018/08

  20. Comparative Study of Aluminosilicate Glass and Zeolite Precursors in Terms of Na Environment and Network Structure

    Hiroki Yamada, Sohei Sukenaga, Koji Ohara, Chokkalingam Anand, Mariko Ando, Hiroyuki Shibata, Tatsuya Okubo, Toru Wakihara

    International Symposium on Zeolites and Microporous Crystals　2018/08

  21. Structural analysis of sodium-aluminosilicate precursors for the synthesis of aluminosilicate zeolites

    Hiroki Yamada, Sohei Sukenaga, Koji Ohara, Hiroyuki Shibata, Tatsuya Okubo, Toru Wakihara

    12th Pacific Rim Conference on Ceramic and Glass Technology　2017/05

  22. ゼオライト前駆体及びアルミノ珪酸塩ガラスの構造比較

    山田大貴, 助永壮平, 尾原幸治, 柴田浩幸, 大久保達也, 脇原徹

    第30回日本放射光学会年会・放射光科学合同シンポジウム　2017/01

  23. 非晶質アルミノ珪酸塩ガラス及びゼオライト前駆体構造の比較

    山田大貴, 助永壮平, 尾原幸治, 柴田浩幸, 大久保達也, 脇原徹

    第29回セラミックス協会秋季シンポジウム　2016/09

  24. 粉砕・再結晶化法によるAFX型ゼオライトナノ粒子の作製及びその応用

    山田大貴, 楢木祐介, 大久保 達也, 脇原 徹

    第31回ゼオライト研究発表会　2015/11

  25. Downsizing AFX Zeolite Crystals to Nanoscale by the Postmilling-Recrystallization Method and their Applications as Ion-exchangers

    Hiroki Yamada, Yusuke Naraki, Tatsuya Okubo, Toru Wakihara

    6th International Symposium on Advanced Micro and Mesoporous Materials　2015/09

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Research Projects 8

  1. 多角的放射光測定および構造モデリングを組み合わせたゼオライト前駆体構造形成の解明

    山田 大貴, 下野聖矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 公益財団法人高輝度光科学研究センター

    2026/04 - 2030/03

  2. Distinct electrocatalytic functions enabled by sub-10 nm metal oxide/hydroxide nanoparticle assemblies

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Hiroshima University

    2025/04/01 - 2028/03/31

  3. 超高速PDF測定と機械学習を駆使した構造解析による超セラミックス形成機構の解明

    山田 大貴

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 学術変革領域研究(A)

    Institution: 公益財団法人高輝度光科学研究センター

    2025/04 - 2027/03

  4. Elucidation of the origin of zeolite crystallization and innovation of production methods

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: The University of Tokyo

    2023/04 - 2027/03

  5. in-situ PDF法と機械学習構造モデリングによる錯体ガラスの形成メカニズムの解明

    山田 大貴

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 学術変革領域研究(A)

    Category: 学術変革領域研究(A)

    Institution: 公益財団法人高輝度光科学研究センター

    2023/04/01 - 2025/03/31

  6. 放射光・大規模計算機を活用した非晶質ゼオライト前駆体形成過程の系統的理解

    山田 大貴

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究

    Category: 若手研究

    Institution: 公益財団法人高輝度光科学研究センター

    2023/04/01 - 2025/03/31

  7. 時分割X線異常散乱測定によるゼオライト結晶化メカニズムの解明

    山田 大貴

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究

    Category: 若手研究

    Institution: 公益財団法人高輝度光科学研究センター

    2021/04/01 - 2023/03/31

    More details Close

    本研究では、シリコン源やアルミニウム源、構造規定剤（無機カチオンや有機カチオン）、アルカリ源、水を混合した後に一定時間水熱合成することで得られるゼオライトおよびその前駆体に対して量子ビームを最大限に活用した元素選択精密構造解析を実施し、前駆体構造中の構造規定剤周辺環境を可視化することを目指している。 昨年度は、ANAおよびRHOと呼ばれる種類のゼオライト合成系において、非晶質前駆体中のCs周辺の環境評価をex situ条件で実施した。これに先立ち元素選択精密構造解析の測定手法・解析手法に関して検討を実施し、実際に元素選択的な構造解析が可能なことを確認した。詳細な解析の結果、Cs周辺環境がこれら二つの系で特異的に異なること、またそれぞれの合成系でのCs周辺環境の構造形成が比較的大きなクラスター単位で形成すること（~0.7 nm程度）が初めて明らかになった。各種量子ビーム実験データを組み合わせた精密三次元構造モデリングの結果も含めて現在論文化を進めている。 放射光を用いた元素選択X線異常散乱時分割測定を実現するためには、均一・かつ濃厚な合成条件が必要である。原料濃度が希薄な条件では比較的安定した結果が得られているが、これを濃厚系へと展開すると攪拌などに問題が生じることが明らかになった。測定手法・解析手法の確立に関しては順調であるため、合成条件を最適化することができればゼオライト合成系に対するX線異常散乱時分割測定が実現可能になる。

  8. 前駆体集積プロセスの制御による合理的なゼオライト合成の実現

    山田 大貴

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東京大学

    2018/04/25 - 2020/03/31

    More details Close

    本研究ではまず無機カチオンを包接する非晶質アルミノシリケートの構造解析を目指した。本研究ではX線異常散乱法を用いた特定の無機カチオン周辺の部分相関解析を実施した。その結果RHO型ゼオライト中でCsが存在する位置であるd8rユニット由来の構造に類似したパターンが非晶質前駆体サンプルで確認され、ANAなどのほかの結晶構造と比べてRHO型ゼオライト前駆体中のCs周辺にすでにd8r類似構造がCs周辺に誘起されている可能性が示唆された。このような知見はこれまでのアプローチでは明らかにすることが困難であった領域であり、ゼオライト結晶化メカニズム解明における本手法の有用性が示された。 また、有機構造規定剤（OSDA）を包接する非晶質アルミノシリケートの構造を選択的に抽出することでOSDAがゼオライトの結晶化の過程でどのようなアルミノシリケート構造を誘起するか明らかにした。具体的にはOSDAの焼成除去前後の散乱パターンの差分を取りOSDAに関係する相関を抽出する方法、並びに中性子線（X線と比較して軽元素の散乱が強い）とX線の散乱から算出したPDF解析を併用することでOSDAに包接するアルミノシリケート構造の直接的な評価を試みた。その結果、*BEA型ゼオライト前駆体中でOSDAがクラスター構造を形成していることが強く示唆された。このようにX線・中性子線散乱を組み合わせることで有機物・アルミノシリケート骨格の両者の構造を包括的に理解することが可能になることが示された。 そして、in situ条件下でのHEXTS法によるPDF解析に加えて、上述のX線異常散乱法や有機物差分法で適用した差分解析を駆使することで誘導時間中の微小な構造変化を可視化することを目指した。その結果、誘導期間中においてアルミノシリケート種の縮合が進行しゼオライト前駆体中のリング分布が徐々に変化していく過程が初めて明らかになった。

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Teaching Experience 1

  1. materials evaluation　Shimane University