Details of the Researcher

PHOTO

Masayuki Watanabe
Section
Graduate School of Engineering
Job title
Professor

Research Areas 1

  • Nanotechnology/Materials / Inorganic and coordination chemistry /

Papers 63

  1. A Raman spectroscopy study of bicarbonate effects on UO2+x

    John McGrady, Yuta Kumagai, Masayuki Watanabe, Akira Kirishima, Daisuke Akiyama, Shingo Kimuro, Takamitsu Ishidera

    Journal of Nuclear Science and Technology　1-9　2023/07/16

    Publisher: Informa UK Limited

    DOI： 10.1080/00223131.2023.2236104 　

    ISSN： 0022-3131

    eISSN： 1881-1248

  2. Lanthanide and Actinide Ion Complexes Containing Organic Ligands Investigated by Surface-Enhanced Infrared Absorption Spectroscopy

    Sakiko Hirata, Ryoji Kusaka, Shogo Meiji, Seita Tamekuni, Kosuke Okudera, Shoken Hamada, Chihiro Sakamoto, Takumi Honda, Kosuke Matsushita, Satoru Muramatsu, Takayuki Ebata, Daisuke Kajiya, Ken-ichi Saitow, Toshiaki Ikeda, Takehiro Hirao, Takeharu Haino, Masayuki Watanabe, Yoshiya Inokuchi

    Inorganic Chemistry　62　(1)　474-486　2022/12/22

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.inorgchem.2c03618 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  3. Phase analysis of simulated nuclear fuel debris synthesized using UO2, Zr, and stainless steel and leaching behavior of the fission products and matrix elements

    Ryutaro Tonna, Takayuki Sasaki, Yuji Kodama, Taishi Kobayashi, Daisuke Akiyama, Akira Kirishima, Nobuaki Sato, Yuta Kumagai, Ryoji Kusaka, Masayuki Watanabe

    Nuclear Engineering and Technology　2022/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.net.2022.12.017 　

    ISSN： 1738-5733

  4. Development of Heavy Element Chemistry at Interfaces: Observing Actinide Complexes at the Oil/Water Interface in Solvent Extraction by Nonlinear Vibrational Spectroscopy

    Ryoji Kusaka, Masayuki Watanabe

    The Journal of Physical Chemistry Letters　13　(30)　7065-7071　2022/08/04

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.jpclett.2c01550 　

    ISSN： 1948-7185

    eISSN： 1948-7185

  5. Selective recovery of thorium and uranium from leach solutions of rare earth concentrates in continuous solvent extraction mode with primary amine N1923

    Nguyen Trong Hung, Le Ba Thuan, Tran Chi Thanh, Nguyen Thanh Thuy, Doan Thi Thu Tra, Khoai Do Van, Masayuki Watanabe, Pham Quang Minh, Hoang Sy Than, Nguyen Duc Vuong, Dinh Van Phuc, Jin-Young Lee, Jong Hyuk Jeon, Rajesh Kumar Jyothi

    Hydrometallurgy　213　105933-105933　2022/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.hydromet.2022.105933 　

    ISSN： 0304-386X

  6. Structure, stability, and actinide leaching of simulated nuclear fuel debris synthesized from UO2, Zr, and stainless-steel

    Akira Kirishima, Daisuke Akiyama, Yuta Kumagai, Ryoji Kusaka, Masami Nakada, Masayuki Watanabe, Takayuki Sasaki, Nobuaki Sato

    Journal of Nuclear Materials　567　153842-153842　2022/08

    Publisher: Elsevier {BV}

    DOI： 10.1016/j.jnucmat.2022.153842 　

    ISSN： 0022-3115

  7. Uranium dissolution and uranyl peroxide formation by immersion of simulated fuel debris in aqueous H2O2 solution

    Yuta Kumagai, Ryoji Kusaka, Masami Nakada, Masayuki Watanabe, Daisuke Akiyama, Akira Kirishima, Nobuaki Sato, Takayuki Sasaki

    Journal of Nuclear Science and Technology　59　(8)　1-11　2022/03/01

    Publisher: Informa UK Limited

    DOI： 10.1080/00223131.2021.2023055 　

    ISSN： 0022-3131

    eISSN： 1881-1248

  8. Stoichiometry of Lanthanide–Phosphate Complexes at the Water Surface Studied Using Vibrational Sum Frequency Generation Spectroscopy and DFT Calculations

    Ryoji Kusaka, Masayuki Watanabe

    The Journal of Physical Chemistry B　125　(24)　6727-6731　2021/06/24

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.jpcb.1c04583 　

    ISSN： 1520-6106

    eISSN： 1520-5207

  9. Distribution of studtite and metastudtite generated on the surface of U3O8: application of Raman imaging technique to uranium compound

    Ryoji Kusaka, Yuta Kumagai, Takumi Yomogida, Masahide Takano, Masayuki Watanabe, Takayuki Sasaki, Daisuke Akiyama, Nobuaki Sato, Akira Kirishima

    Journal of Nuclear Science and Technology　58　(6)　629-634　2021/06/03

    DOI： 10.1080/00223131.2020.1854881 　

    ISSN： 0022-3131

    eISSN： 1881-1248

  10. Electrochemical studies of uranium (IV) in an ionic liquid–DMF mixture to build a redox flow battery using uranium as an electrode active material

    Kazuki Ouchi, Atsushi Komatsu, Koichiro Takao, Yoshihiro Kitatsuji, Masayuki Watanabe

    Chemistry Letters　2021/03/11

    Publisher: The Chemical Society of Japan

    DOI： 10.1246/cl.210060 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  11. The kinetics and mechanism of H2O2 decomposition at the U3O8 surface in bicarbonate solution

    John McGrady, Yuta Kumagai, Masayuki Watanabe, Akira Kirishima, Daisuke Akiyama, Akira Kitamura, Shingo Kimuro

    RSC Advances　11　(46)　28940-28948　2021

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d1ra05580a 　

    eISSN： 2046-2069

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    A transition from catalytic to oxidative H2O2 decomposition on U3O8 was observed with NaHCO3 with significant implications for uranium dissolution.

  12. Application of photoluminescence microspectroscopy: a study on transfer of uranyl and europium ions on dry silica gel plate

    Ryoji Kusaka, Masayuki Watanabe

    Journal of Nuclear Science and Technology　57　(9)　1046-1050　2020/09/01

    Publisher: Informa UK Limited

    DOI： 10.1080/00223131.2020.1755734 　

    ISSN： 0022-3131

    eISSN： 1881-1248

  13. High-Efficiency Synthesis and Properties of Latent Pigment Red 272DPP-BOC by Microwave Irradiation

    Tomoji Ohishi, Yu Kimura, Kiyohiko Nakajima, Masayuki Watanabe, Noboru Aoyagi

    Materials Sciences and Applications　11　(03)　195-203　2020/03

    Publisher: Scientific Research Publishing, Inc.

    DOI： 10.4236/msa.2020.113013 　

    ISSN： 2153-117X

    eISSN： 2153-1188

  14. Optimization of sulfuric acid leaching of a Vietnamese rare earth concentrate

    Nguyen Trong Hung, Le Ba Thuan, Tran Chi Thanh, Masayuki Watanabe, Hoang Nhuan, Do Van Khoai, Nguyen Thanh Thuy, Nguyen Van Tung, Noboru Aoyagi, Doan Thi Thu Tra, Nguyen Trung Minh, Manish Kumar Jha, Jin-Young Lee, Rajesh Kumar Jyothi

    Hydrometallurgy　191　105195-105195　2020/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.hydromet.2019.105195 　

    ISSN： 0304-386X

  15. Benchmark study of DFT with Eu and Np Mössbauer isomer shifts using second-order Douglas-Kroll-Hess Hamiltonian Peer-reviewed

    Masashi Kaneko, Masayuki Watanabe, Sunao Miyashita, Satoru Nakashima

    Hyperfine Interactions　239　(1)　2018/12/01

    DOI： 10.1007/s10751-018-1495-1 　

    ISSN： 1572-9540 0304-3843

  16. Mechanism of phase transfer of uranyl ions: a vibrational sum frequency generation spectroscopy study on solvent extraction in nuclear reprocessing Peer-reviewed

    Ryoji Kusaka, Masayuki Watanabe

    Physical Chemistry Chemical Physics　20　(47)　29588-29590　2018/11

    DOI： 10.1039/c8cp04558e 　

    ISSN： 1463-9076

    eISSN： 1463-9084

  17. Computational chemical analysis of Eu(III) and Am(III) complexes with pnictogen-donor ligands using DFT calculations (Back cover) Peer-reviewed

    Taiki Kimura, Masashi Kaneko, Masayuki Watanabe, Sunao Miyashita, Satoru Nakashima

    Dalton Transactions　47　(42)　14924-14931　2018/10

    DOI： 10.1039/C8DT01973H 　

  18. Solvent dependence of the emission intensities in photoluminescent mononuclear europium(III) complexes with tetradentate Schiff base ligands Peer-reviewed

    Masanobu Tsuchimoto, Masako Ookusa, Shuhei Itoh, Masayuki Watanabe, Kiyohiko Nakajima

    Polyhedron　148　118-123　2018/07/01

    DOI： 10.1016/j.poly.2018.04.010 　

    ISSN： 0277-5387

  19. Correlation between Am(III)/Eu(III) selectivity and covalency in metal–chalcogen bonds using density functional calculations Peer-reviewed

    Masashi Kaneko, Masayuki Watanabe

    Journal of Radioanalytical and Nuclear Chemistry　316　(3)　1129-1137　2018/06/01

    DOI： 10.1007/s10967-017-5683-2 　

    ISSN： 1588-2780 0236-5731

  20. Radiation-induced degradation of aqueous 2–chlorophenol assisted by zeolites Peer-reviewed

    Yuta Kumagai, Atsushi Kimura, Mitsumasa Taguchi, Masayuki Watanabe

    Journal of Radioanalytical and Nuclear Chemistry　316　(1)　341-348　2018/04/01

    DOI： 10.1007/s10967-018-5762-z 　

    ISSN： 1588-2780 0236-5731

  21. Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of Hg 201 Peer-reviewed

    A. Yoshimi, H. Hara, T. Hiraki, Y. Kasamatsu, S. Kitao, Y. Kobayashi, K. Konashi, R. Masuda, T. Masuda, Y. Miyamoto, K. Okai, S. Okubo, R. Ozaki, N. Sasao, O. Sato, M. Seto, T. Schumm, Y. Shigekawa, S. Stellmer, K. Suzuki, S. Uetake, M. Watanabe, A. Yamaguchi, Y. Yasuda, Y. Yoda, K. Yoshimura, M. Yoshimura

    Physical Review C　97　(2)　24607　2018/02/08

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevC.97.024607 　

    ISSN： 2469-9993 2469-9985

    eISSN： 2469-9993

  22. The structure of a lanthanide complex at an extractant/water interface studied using heterodyne-detected vibrational sum frequency generation Peer-reviewed

    Ryoji Kusaka, Masayuki Watanabe

    Physical Chemistry Chemical Physics　20　(4)　2809-2813　2018/01

    DOI： 10.1039/c7cp06758e 　

    ISSN： 1463-9076

  23. Reaction of hydrogen peroxide with uranium zirconium oxide solid solution - Zirconium hinders oxidative uranium dissolution Peer-reviewed

    Yuta Kumagai, Masahide Takano, Masayuki Watanabe

    JOURNAL OF NUCLEAR MATERIALS　497　54-59　2017/12

    DOI： 10.1016/j.jnucmat.2017.10.050 　

    ISSN： 0022-3115

    eISSN： 1873-4820

  24. Bonding Study on Trivalent Europium Complexes by Combining Moessbauer Isomer Shifts with Density Functional Calculations Peer-reviewed

    Masashi Kaneko, Masayuki Watanabe, Sunao Miyashita, Satoru Nakashima

    RADIOISOTOPES　66　289-300　2017/08

    DOI： 10.3769/radioisotopes.66.289 　

    More details Close

    Scalar-relativistic density functional calculations were applied to some trivalent europium complexes to discuss the covalent interactions in their coordination bonds. Five Eu (III) complexes whose 151Eu Mössbauer isomer shifts vary from −1.77 to 0.57 mm s−1 were modeled by referring previously reported Mössbauer experiments. Geometrical optimizations of their complexes using BP86 functional reproduced the experimental coordination structures. Single-point calculations were applied to their optimized geometries at three different density functionals, namely, BP86, B3LYP, and B2PLYP, to obtain their electron densities at Eu nucleus. A comparison of the linearity between the electron densities and the corresponding 151Eu Mössbauer isomer shifts revealed that the B2PLYP functional shows the best linearity. We also performed electron population and bond analyses of the molecular orbitals in their complexes obtained by single-point calculations using Mulliken’s procedure. As a result, the electron densities of both d- and f-orbital electrons of Eu ion in the complexes were found to be correlated to the experimental 151Eu Mössbauer isomer shifts. This result indicated that the d- and f-orbital electrons in the Eu ion are involved in the covalent interaction of the coordination bond between the Eu ion and the ligands.

  25. Hydrogen Production by gamma-Ray Irradiation from Different Types of Zeolites in Aqueous Solution Peer-reviewed

    Yuta Kumagai, Atsushi Kimura, Mitsumasa Taguchi, Masayuki Watanabe

    JOURNAL OF PHYSICAL CHEMISTRY C　121　(34)　18525-18533　2017/08

    DOI： 10.1021/acs.jpcc.7b03532 　

    ISSN： 1932-7447

  26. Roles of d- and f-orbital electrons in the complexation of Eu(III) and Am(III) ions with alkyldithiophosphinic acid and alkylphosphinic acid using scalar-relativistic DFT calculations Peer-reviewed

    Masashi Kaneko, Masayuki Watanabe, Sunao Miyashita, Satoru Nakashima

    Journal of Nuclear and Radiochemical Sciences　17　9-15　2017/03

  27. The separation mechanism of Am(III) from Eu(III) by diglycolamide and nitrilotriacetamide extraction reagents using DFT calculations Peer-reviewed

    Masashi Kaneko, Masayuki Watanabe, Tatsuro Matsumura

    DALTON TRANSACTIONS　45　(43)　17530-17537　2016/10

    DOI： 10.1039/c6dt03002e 　

    ISSN： 1477-9226

    eISSN： 1477-9234

  28. Column study on electrochemical separation of cesium ions from wastewater using copper hexacyanoferrate film Peer-reviewed

    Rongzhi Chen, Miyuki Asai, Chikako Fukushima, Manabu Ishizaki, Masato Kurihara, Makoto Arisaka, Takuya Nankawa, Masayuki Watanabe, Tohru Kawamoto, Hisashi Tanaka

    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY　303　(2)　1491-1495　2015/02

    DOI： 10.1007/s10967-014-3588-x 　

    ISSN： 0236-5731

    eISSN： 1588-2780

  29. Optical properties of tetravalent uranium complexes in non-aqueous media Peer-reviewed

    Noboru Aoyagi, Masayuki Watanabe, Akira Kirishima, Nobuaki Sato, Takaumi Kimura

    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY　303　(2)　1095-1098　2015/02

    DOI： 10.1007/s10967-014-3616-x 　

    ISSN： 0236-5731

    eISSN： 1588-2780

  30. Cesium adsorption ability and stability of metal hexacyanoferrates irradiated with gamma rays Peer-reviewed

    Makoto Arisaka, Masayuki Watanabe, Manabu Ishizaki, Masato Kurihara, Rongzhi Chen, Hisashi Tanaka

    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY　303　(2)　1543-1547　2015/02

    DOI： 10.1007/s10967-014-3710-0 　

    ISSN： 0236-5731

    eISSN： 1588-2780

  31. Crystal Field Splitting of the Ground State of Terbium(III) and Dysprosium(III) Complexes with a Triimidazolyl Tripod Ligand and an Acetate Determined by Magnetic Analysis and Luminescence Peer-reviewed

    Seira Shintoyo, Keishiro Murakami, Takeshi Fujinami, Naohide Matsumoto, Naotaka Mochida, Takayuki Ishida, Yukinari Sunatsuki, Masayuki Watanabe, Masanobu Tsuchimoto, Jerzy Mrozinski, Cecilia Coletti, Nazzareno Re

    INORGANIC CHEMISTRY　53　(19)　10359-10369　2014/10

    DOI： 10.1021/ic501453h 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  32. Synthesis, Structure, Luminescence, and Magnetic Properties of a Single-Ion Magnet "mer"-[Tris(N-[(imidazol-4-yl)-methylidene]-DL-phenylalaninato)terbium(III) and Related "fac"-DL-Alaninato Derivative Peer-reviewed

    Suguru Yamauchi, Takeshi Fujinami, Naohide Matsumoto, Naotaka Mochida, Takayuki Ishida, Yukinari Sunatsuki, Masayuki Watanabe, Masanobu Tsuchimoto, Cecilia Coletti, Nazzareno Re

    INORGANIC CHEMISTRY　53　(12)　5961-5971　2014/06

    DOI： 10.1021/ic5001599 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  33. Development of extraction chromatographic adsorbent using alkylpyridinedicarboxyamides as extractant for separation of trivalent minor actinides from lanthanides - stability and separation ability against nitric acid exposure and gamma-ray irradiation Peer-reviewed

    Makoto Arisaka, Masayuki Watanabe, Yumi Sugo, Kumiko Kobayashi, Osamu Kanao, Takaumi Kimura

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY　51　(4)　457-464　2014/04

    DOI： 10.1080/00223131.2014.874301 　

    ISSN： 0022-3131

    eISSN： 1881-1248

  34. Thermodynamics and Mechanism Studies on Electrochemical Removal of Cesium Ions from Aqueous Solution Using a Nanoparticle Film of Copper Hexacyanoferrate Peer-reviewed

    Rongzhi Chen, Hisashi Tanaka, Tohru Kawamoto, Miyuki Asai, Chikako Fukushima, Masato Kurihara, Manabu Ishizaki, Masayuki Watanabe, Makoto Arisaka, Takuya Nankawa

    ACS APPLIED MATERIALS & INTERFACES　5　(24)　12984-12990　2013/12

    DOI： 10.1021/am403748b 　

    ISSN： 1944-8244

  35. New alkyl-pyridinedicarboxyamides as extractants for separationof trivalent minor actinides from fission products by extractionchromatography Peer-reviewed

    M. Arisaka, M. Watanabe, T. Kimura

    Radiochimica Acta　101　(11)　711-717　2013/11/01

    Publisher: Walter de Gruyter GmbH

    DOI： 10.1524/ract.2013.2086 　

    ISSN： 0033-8230

    eISSN： 2193-3405

    More details Close

    <title>Abstract</title> Four new alkyl-pyridinedicarboxyamides (R-PDA; R = butyl, octyl, decyl, dodecyl) were synthesized and used as extractants for partitioning minor actinides from high level radioactive waste using extraction chromatography. The R-PDAs were successfully impregnated into XAD resins (Amberlite). The prepared adsorbents, R-PDA/XAD, exhibited moderate adsorptions of both Am(III) and Eu(III), and separation between Am(III) and Eu(III), over a high HNO3 concentration range (3–5 M). Deterioration of the prepared adsorbent as a result of contact with HNO3 solution was prevented by using R-PDAs containing longer alkyl groups. The equilibrium data for Eu(III) were analyzed using Langmuir and Freundlich isotherm models. The adsorption of Eu(III) ions onto the R-PDA/XAD was fitted better to the Langmuir isotherm than to the Freundlich isotherm. The maximum adsorption capacity was determined to be 24.2 mg Eu/g (R-PDA/XAD).

  36. Proton-exchange mechanism of specific Cs+ adsorption via lattice defect sites of Prussian blue filled with coordination and crystallization water molecules Peer-reviewed

    M. Ishizaki, S. Akiba, A. Ohtani, Y. Hoshi, K. Ono, M. Matsuba, T. Togashi, K. Kananizuka, M. Sakamoto, A. Takahashi, T. Kawamoto, H. Tanaka, M. Watanabe, M. Arisaka, T. Nankawa, M. Kurihara

    Dalton Transactions　42　(45)　16049-16049　2013/07

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/c3dt51637g 　

    ISSN： 1477-9226

    eISSN： 1477-9234

  37. Selective removal of cesium ions from wastewater using copper hexacyanoferrate nanofilms in an electrochemical system Peer-reviewed

    Rongzhi Chen, Hisashi Tanaka, Tohru Kawamoto, Miyuki Asai, Chikako Fukushima, Haitao Na, Masato Kurihara, Masayuki Watanabe, Makoto Arisaka, Takuya Nankawa

    ELECTROCHIMICA ACTA　87　119-125　2013/01

    DOI： 10.1016/j.electacta.2012.08.124 　

    ISSN： 0013-4686

  38. Preparation of a film of copper hexacyanoferrate nanoparticles for electrochemical removal of cesium from radioactive wastewater Peer-reviewed

    Rongzhi Chen, Hisashi Tanaka, Tohru Kawamoto, Miyuki Asai, Chikako Fukushima, Masato Kurihara, Masayuki Watanabe, Makoto Arisaka, Takuya Nankawa

    ELECTROCHEMISTRY COMMUNICATIONS　25　23-25　2012/11

    DOI： 10.1016/j.elecom.2012.09.012 　

    ISSN： 1388-2481

  39. Chemical states of fallout radioactive Cs in the soils deposited at Fukushima Daiichi Nuclear Power Plant accident Peer-reviewed

    Naofumi Kozai, Toshihiko Ohnuki, Makoto Arisaka, Masayuki Watanabe, Fuminori Sakamoto, Shinya Yamasaki, Mingyu Jiang

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY　49　(5)　473-478　2012/05

    DOI： 10.1080/00223131.2012.677131 　

    ISSN： 0022-3131

  40. Removal of cesium from aqueous solutions by copper hexacyanoferrate membrane coated electrodes in a electrochemical adsorption system Peer-reviewed

    R. Z. Chen, H. Tanaka, T. Kawamoto, M. Asai, C. Fukushima, M. Watanabe, M. Kurihara, M. Arisaka, T. Nankawa

    EUROMEMBRANE CONFERENCE 2012　44　1728-1730　2012

    DOI： 10.1016/j.proeng.2012.08.926 　

    ISSN： 1877-7058

  41. Selective adsorption of trivalent actinides from lanthanides onto activated carbons in acidic aqueous solution Peer-reviewed

    M. Arisaka, M. Watanabe, T. Kimura

    Journal of Nuclear Materials　407　(2)　116-118　2010/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.jnucmat.2010.06.016 　

    ISSN： 0022-3115

  42. Photoluminescence via Two Different Excited States in a Mononuclear Europium(III) Complex with Tetradentate Schiff Base Ligands Peer-reviewed

    Shouta Ebato, Masayuki Watanabe, Kiyohiko Nakajima, Masanobu Tsuchimoto

    CHEMISTRY LETTERS　39　(7)　706-707　2010/07

    DOI： 10.1246/cl.2010.706 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  43. Synergistic Extraction of Am(III) and Eu(III) by Tris(2-pyridylmethyl)Amine with Various Anions in 1,2-Dichloroethane Peer-reviewed

    Ken-Ichiro Ishimori, Masayuki Watanabe, Tsuyoshi Yaita, Takaumi Kimura, Takashi Yamada, Satoshi Shinoda, Hiroshi Tsukube

    SOLVENT EXTRACTION AND ION EXCHANGE　27　(4)　489-500　2009/07

    DOI： 10.1080/07366290902966944 　

    ISSN： 0736-6299

  44. Low-energy spectrum of a Tm-based double-decker complex Peer-reviewed

    N. Magnani, R. Caciuffo, E. Colineau, F. Wastin, A. Baraldi, E. Buffagni, R. Capelletti, S. Carretta, M. Mazzera, D. T. Adroja, M. Watanabe, A. Nakamura

    Physical Review B　79　(10)　2009/03/09

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.79.104407 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  45. Modification of the luminescence spectra of chloro(tetrapyridylcyclotetramine)europium complexes by fine tuning of the Eu-Cl distance with outer-sphere counterions in the solid state, in a polymer matrix and in solution Peer-reviewed

    Atsushi Wada, Masayuki Watanabe, Yoshinori Yamanoi, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS　(14)　1671-1673　2008/02

    DOI： 10.1039/b716987f 　

    ISSN： 1359-7345

  46. Solvent extraction of palladium(II) with various ketones from nitric acid medium Peer-reviewed

    Nguyen Trong Hung, Masayuki Watanabe, Takaumi Kimura

    SOLVENT EXTRACTION AND ION EXCHANGE　25　(3)　407-416　2007/05

    DOI： 10.1080/07366290701285538 　

    ISSN： 0736-6299

  47. Control of coordination and luminescence properties of lanthanide complexes using octadentate oligopyridine-amine ligands Peer-reviewed

    Atsushi Wada, Masayuki Watanabe, Yoshinori Yamanoi, Takuya Nankawa, Kosuke Namiki, Mikio Yamasaki, Masaki Murata, Hiroshi Nishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN　80　(2)　335-345　2007/02

    DOI： 10.1246/bcsj.80.335 　

    ISSN： 0009-2673

    eISSN： 1348-0634

  48. Ion-pair extraction of Am(III) and Eu(III) with oligo-pyridine ligand Peer-reviewed

    Ken-Ichiro Ishimori, Masayuki Watanabe, Takaumi Kimura, Masaki Murata, Hiroshi Nishihara

    Journal of Alloys and Compounds　408-412　1278-1282　2006/02/09

    DOI： 10.1016/j.jallcom.2005.04.129 　

    ISSN： 0925-8388

  49. Novel separation system of trivalent actinides-combined effects of substituted tris(2-pyridylmethyl)amine ligand and hydrophobic counter-anion Peer-reviewed

    Kenichiro Ishimori, Masayuki Watanabe, Takaumi Kimura, Tsuyoshi Yaita, Takashi Yamada, Yumiko Kataoka, Satoshi Shinoda, Hiroshi Tsukube

    Chemistry Letters　34　(8)　1112-1113　2005/08/05

    DOI： 10.1246/cl.2005.1112 　

    ISSN： 0366-7022

  50. Selective Extraction of Americium(III) over Macroscopic Concentration of Lanthanides(III) by Synergistic System of TPEN and D2EHPA in 1‐Octanol Peer-reviewed

    Masayuki Watanabe, Rinat Mirvaliev, Shoichi Tachimori, Kenji Takeshita, Yoshio Nakano, Koshi Morikawa, Takahiro Chikazawa, Ryohei Mori

    Solvent Extraction and Ion Exchange　22　(3)　377-390　2004/12/31

    Publisher: Informa UK Limited

    DOI： 10.1081/sei-120030391 　

    ISSN： 0736-6299

    eISSN： 1532-2262

  51. Selective Separation of Am(III) from Ln(III) with a Novel Synergistic Extraction System, N, N, N', N'-tetrakis(2-methylpyridyl)ethylenediamine (TPEN) and Decanoic Acid in 1-Octanol

    Rinat Mirvaliev, Masayuki Watanabe, Tatsuro Matsumura, Shoichi Tachimori, Kenji Takeshita

    Journal of Nuclear Science and Technology　41　(11)　1122-1124　2004/09

    DOI： 10.3327/jnst.41.1122 　

    ISSN： 0022-3131 1881-1248

  52. Extraction separation of Cd(II) and Zn(II) with Cyanex301 and aqueous nitrogen-donor ligand TPEN Peer-reviewed

    K Takeshita, K Watanabe, Y Nakano, M Watanabe

    SOLVENT EXTRACTION AND ION EXCHANGE　22　(2)　203-218　2004/02

    DOI： 10.1081/SEI-120030388 　

    ISSN： 0736-6299

  53. Selective separation of Am(III) from Ln(III) with a novel synergistic extraction system, N, N, N′, N′-tetrakis(2-methylpyridyl)-ethylenediamine (TPEN) and carboxylic acid in 1-Octanol

    Rinat Mirvaliev, Masayuki Watanabe, Tatsuro Matsumura, Shoichi Tachimori, Kenji Takeshita

    Journal of Nuclear Science and Technology　41　(11)　1122-1124　2004

    DOI： 10.1080/18811248.2004.9726339 　

    ISSN： 0022-3131

  54. Photoluminescent dinuclear lanthanide complexes with tris(2-pyridyl)carbinol acting as a new tetradentate bridging ligand Peer-reviewed

    M Watanabe, T Nankawa, T Yamada, T Kimura, K Namiki, M Murata, H Nishihara, S Tachimori

    INORGANIC CHEMISTRY　42　(22)　6977-6979　2003/11

    DOI： 10.1021/ic034816n 　

    ISSN： 0020-1669

  55. Solvent extraction separation of Cd(II) and Zn(II) with the organophosphorus extractant D2EHPA and the aqueous nitrogen-donor ligand TPEN Peer-reviewed

    Kenji Takeshita, Kunio Watanabe, Yoshio Nakano, Masayuki Watanabe

    Hydrometallurgy　70　(1-3)　63-71　2003/07

    Publisher: Elsevier BV

    DOI： 10.1016/s0304-386x(03)00046-x 　

    ISSN： 0304-386X

  56. Synthesis of novel lanthanide complexes with quinone-containing ligands and their redox controlled magnetic interaction Peer-reviewed

    Takuya Nankawa, Masayuki Watanabe, Masaki Murata, Hiroshi Nishihara

    Chemistry Letters　32　(3)　286-287　2003/03/05

    DOI： 10.1246/cl.2003.286 　

    ISSN： 0366-7022

  57. Oxidatively robust monophenolate-copper(ii) complexes as potential models of galactose oxidaseElectronic supporting information (ESI) available: Synthetic procedures and instrumental methods, crystallographic data for [LPhenCuII(CF3SO3)] and [LPhenCuIICl], and Figures S1, S2 and S3. See http://www.rsc.org/suppdata/cc/b2/b212921c/ Peer-reviewed

    Robertus J. M. Klein Gebbink, Masayuki Watanabe, Russell C. Pratt, T. Daniel P. Stack

    Chemical Communications　(5)　630-631　2003/02/20

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/b212921c 　

    ISSN： 1359-7345

    eISSN： 1364-548X

  58. Extraction of Cd(II) and Zn(II) with Dialkylthiophosphinic Acid and Hexadentate Nitrogen-donor Ligand Peer-reviewed

    Kenji Takeshita, Kunio Watanabe, Yoshio Nakano, Masayuki Watanabe

    Chemistry Letters　32　(1)　96-97　2003/01

    DOI： 10.1246/cl.2003.96 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  59. Separation of americium(III) from lanthanide by encapsulating hexadentate-ligand Peer-reviewed

    M Watanabe, R Mirvaliev, S Tachimori, K Takeshita, Y Nakano, K Morikawa, R Mori

    CHEMISTRY LETTERS　(12)　1230-1231　2002/12

    DOI： 10.1246/cl.2002.1230 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  60. Back-extraction of tri- and tetravalent actinides from diisodecylphosphoric acid (DIDPA) with hydrazine carbonate Peer-reviewed

    M. Watanabe, R. Tatsugae, Y. Morita, M. Kubota

    Journal of Radioanalytical and Nuclear Chemistry　252　(1)　53-57　2002/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1023/a:1015279519321 　

    ISSN： 0236-5731

  61. Back-extraction of uranium(VI) from organophosphoric acid with hydrazine carbonate Peer-reviewed

    M. Watanabe, R. Tatsugae, K. Shirahashi, Y. Morita, M. Kubota

    Journal of Radioanalytical and Nuclear Chemistry　250　(2)　377-379　2001/11

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1023/a:1017980520304 　

    ISSN： 0236-5731

  62. Back-Extraction of Tri- and Tetravalent Actinides from Di(2-ethylhexyl)phosphoric Acid (HDEHP) with Hydrazine Carbonate Peer-reviewed

    Masayuki Watanabe, Yasuji Morita, Masumitsu Kubota, Ryozo Tatsugae

    Radiochim Acta　87　(3-4)　115-120　1999/10/01

    Publisher: Walter de Gruyter GmbH

    DOI： 10.1524/ract.1999.87.34.115 　

    ISSN： 0033-8230

    eISSN： 2193-3405

  63. Syntheses and Crystal Structures of Bis(dimethyldithiocarbamato)(4,6-diphenyl-4,6-diphosphanonane-1,9-diammonium)cobalt(III) and Chloro(4,9-diphenyl-4,9-diphosphadodecane-1,12-diamine)nickel(II) Complexes Peer-reviewed

    Masayuki WATANABE

    Bulletin of the Chemical Society of Japan　69　(7)　1947-1953　1996/07

    Publisher: The Chemical Society of Japan

    DOI： 10.1246/bcsj.69.1947 　

    ISSN： 1348-0634

    More details Close

    The reaction of tetramethylthiuram disulfide with a methanol solution containing CoCl2·6H2O and 4,6-diphenyl-4,6-diphosphanonane-1,9-diamine (313NPPN) gave complexes of [Co(dtc)2{rac(P)- or meso(P)-313HNPPNH}]3+ (313HNPPNH = diprotonated form of 313NPPN, dtc = dimethyldithiocarbamate ion). The crystal structure of the perchlorate salt of the meso(P) isomer was determined by X-ray analysis. Crystal data: monoclinic, P21/c, a = 10.789(2), b = 30.325(9), c = 12.888(2) Å, β = 102.06(1)°, V = 4123(1) Å3, Dx = 1.55 g cm−3, Z = 4, and R = 0.077 for 3347 reflections. The 313HNPPNH ligand in the complex coordinates to the Co(III) center through two phosphorus atoms as a didentate four-membered chelate ligand. The crystal structure of [Co(dtc)2{NH2(CH2)3P(CH2OH)(C6H5)}]B(C6H5)4, which formed as a by-product in the preparation of the above Co(III)–313HNPPNH complexes, was also determined. Crystal data: triclinic, , a = 13.817(2), b = 15.277(3), c = 10.737(2) Å, α = 109.90(1), β = 94.14(2), γ = 101.00(1)°, V = 2068.8(7) Å3, Dx = 1.31 g cm−3, Z = 2, and R = 0.053 for 4303 reflections. [NiCl{rac(P)-343NPPN}]PF6 (343NPPN = 4,9-diphenyl–4,9-diphosphadodecane-1,12-diamine) was prepared by the reaction of 343NPPN with NiCl2·6H2O, and the crystal structure was determined. Crystal data: monoclinic, P21/n, a = 8.367(2), b = 24.058(2), c = 13.988(2) Å, β = 106.17(1)°, V = 2704(1) Å3, Dx = 1.54 g cm−3, Z = 4, and R = 0.053 for 3043 reflections. The geometry of the complex is a distorted square pyramid with a chloride ion at the apical position, and the 343NPPN ligand functions as a tetradentate chelate ligand.

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Misc. 23

  1. Basic Research on the Stability of Fuel Debris including Alloy Phase

    2022　(009)　2022/06

    DOI： 10.11484/jaea-review-2022-009 　

  2. Carrying-out of whole nuclear fuel materials in Plutonium Research Building No.1

    Inagawa Jun, Kitatsuji Yoshihiro, Otobe Haruyoshi, Nakada Masami, Takano Masahide, Akie Hiroshi, Shimizu Osamu, Komuro Michiyasu, Oura Hirofumi*, Nagai Isao*, Harada Katsuya, Suzuki Kazuhiro, Morita Ryo, Ishikawa Junji*, Tachihara Otonori*, Kida Takashi, Watanabe Masayuki

    JAEA-Technology 2021-001　144　2021/08

    DOI： 10.11484/jaea-technology-2021-001 　

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    Plutonium Research Building No.1 (Pu1) was qualified as a facility to decommission, and preparatory operations for decommission were worked by the research groups users and the facility managers of Pu1. The operation of transportation of whole nuclear materials in Pu1 to Back-end Cycle Key Element Research Facility (BECKY) completed at Dec. 2020. In the operation included evaluation of criticality safety for changing permission of the license for use nuclear fuel materials in BECKY, cask of the transportation, the registration request of the cask at the institute, the test transportation, formulation of plan for whole nuclear materials transportation, and the main transportation. This report circumstantially shows all of those process to help prospective decommission.

  3. 合金相を含む燃料デブリの安定性評価のための基盤研究 －令和元年度 英知を結集した原子力科学技術・人材育成推進事業－

    桐島陽, 佐藤修彰, 秋山大輔, 渡邉雅之, 熊谷友多, 日下良二, 佐々木隆之

    JAEA-Review　2020　(032)　2021/01

    Publisher: 日本原子力研究開発機構

    DOI： 10.11484/jaea-review-2020-032 　

  4. Back cover

    Taiki Kimura, Masashi Kaneko, Masayuki Watanabe, Sunao Miyashita, Satoru Nakashima

    Dalton Transactions　47　(42)　15256　2018/10

    DOI： 10.1039/C8DT90189A 　

  5. Mechanism of liquid-liquid solvent extraction of uranyl by tributyl phosphate: A study using vibrational sum frequency generation spectroscopy

    Kusaka Ryoji, Watanabe Masayuki

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　256　2018/08/19

    ISSN： 0065-7727

  6. Synthesis and properties of novel cesium containing lanthanide-organic framework Peer-reviewed

    Nankawa Takuya, Ogoshi Yurie, Watanabe Masayuki

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　243　2012/03/25

    ISSN： 0065-7727

  7. 土壌中における放射性Csの化学状態

    大貫敏彦, 香西直文, 有阪真, 渡邉雅之, 坂本文徳

    日本原子力学会春の年会予稿集(CD-ROM)　2012　ROMBUNNO.I30　2012/03/02

    DOI： 10.11561/aesj.2012s.0.613.0 　

  8. Investigation on electrochemical separation of cesium ions from wastewater using nanoparticle film of copper hexacyanoferrate.:Effect of pH on cesium removal using the nanoparticle film and its possible mechanism

    Chen Rongzhi, Tanaka Hisashi, Asai Miyuki, Fukushima Chikako, Kawamoto Tohru, Kurihara Masato, Arisaka Makoto, Nankawa Takuya, Watanabe Masayuki

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan　2012　540-540　2012

    Publisher: Atomic Energy Society of Japan

    DOI： 10.11561/aesj.2012f.0.540.0 　

  9. Investigation on electrochemical separation of cesium ions from wastewater using nanoparticle film of copper hexacyanoferrate:(1) Influence of coexisting ions on nano particle electrode of copper hexacyanoferrate

    TANAKA Hisashi, CHEN Rongzhi, ASAI Miyuki, FUKUSHIMA Chikako, KAWAMOTO Tohru, KURIHARA Masato, ARISAKA Makoto, NANKAWA Takuya, WATANABE Masayuki

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan　2012　539-539　2012

    Publisher: Atomic Energy Society of Japan

    DOI： 10.11561/aesj.2012f.0.539.0 　

  10. ICONE19-43912 ELECTROCHEMICAL CESIUM RECOVERY USING NANOPARTICLE INK OF METAL HEXACYANOFERRATE

    Tanaka Hisashi, Kawamoto Tohru, Asai Miyuki, Fukushima Chikako, Kurihara Masato, Watanabe Masayuki, Arisaka Makoto, Nankawa Takuya

    Proceedings of the ... International Conference on Nuclear Engineering. Book of abstracts : ICONE　2011　(19)　"ICONE1943912-1"-"ICONE1943912-7"　2011/08/01

    Publisher: The Japan Society of Mechanical Engineers

    More details Close

    Since Prussian blue (PB, or FeHCF) and its analogues (PBAs or MHCF (M=Ni, Zn, Co, Cu, etc.)) are well known as adsorbents of some ions or small molecules, especially, alkali metal cations such as Na^+, K^+, and Cs^+, these materials had been regarded as promising adsorbents to remove a radioactive Cs^+ from radioactive wastes. However, to adsorb a radioactive Cs^+ with MHCF causes the increase of radioactive wastes, so it is important to develop a reusable new system, or a controllable Cs^+ adsorbing/desorbing system. We succeeded in preparing nanoparticle inks of MHCFs, which are able to disperse into several solvents, and able to form films with the nanoparticle inks by conventional wet processes. Then we prepared the CuHCF nanoparticle films on Au/quartz substrates by a spin-coating method, and attempted to control the adsorption or desorption of alkali metal cations electrochemically. The electrochemical redox by cyclic voltammetry (CV) and adsorption/desorption measurement by electrochemical quartz crystal microbalance (EQCM) were carried out synchronously. For example, a copper substituted PBA, CuHCF films showed stable reversible redox signals for Na^+, K^+, and Cs^+ in the aqueous solution dissolving the corresponding nitrate salts (NaNO_3, KNO_3, and CsNO_3) as electrolytes. The redox potentials were different to each other, +0.55 V, +0.65 V, and +0.90 V (vs. SCE) for Na^+, K^+, and Cs^+, respectively. According to EQCM measurement, the mass changes followed by a cation adsorption/desorption occurred at the above-described potentials respectively and the ratios of mass showed almost 1:1:6 for Na^+:K^+:Cs^+. The difference of redox potentials and good duplicability of CV and EQCM signals suggests the possibility of electrochemically controllable cation adsorbing/desorbing systems.

  11. Adsorption of trivalent actinides and lanthanides to carbon materials

    Masayuki Watanabe, Makoto Arisaka, Takaumi Kimura

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　239　2010/03

    ISSN： 0065-7727

  12. Actinide separation research at Nuclear Science and Engineering Directorate

    Sasaki, Yuji, Suzuki, Shinichi, Kitatsuji, Yoshihiro, Watanabe, Masayuki, Arisaka, Makoto, Kimura, Takaumi, Ban, Yasutoshi, Asakura, Toshihide, Morita, Yasuji

    J-ACTINET 2008　2008/10

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    経済性,環境負荷低減性の高い次世代軽水炉,高速炉サイクルの開発の一環として、地層処分の効率化,核不拡散性の確保,長半減期核種の核変換、に関連する分離技術の構築を行ってきた。われわれが着目した溶媒抽出法は大容量の取り扱い,反応の速さに特徴を持ち、長い歴史を有する実証済みの技術である。加えて、優れた新抽出剤を柔軟に導入し、目的元素を選択的・系統的に回収できる利点を持つ。2001年に登場したTODGAを代表として、ここ10年間に分離性能の異なる抽出剤を積極的に開発し、それに呼応して米国,仏国の再処理・MA・FP分離プロセスの高度化が進んでいる。われわれのグループでは新抽出剤の開発からプロセス基礎試験までの幅広い研究分野を展開させ、分離基礎試験を行ってきた。ここでは、最近の成果及び次世代部門との連携とその内容についての紹介を行う。

  13. Control of the coordination environments and the luminescence properties of the Eu^<3+> complexes by counter-anions

    WADA Atsushi, WATANABE Masayuki, YAMANOI Yoshinori, NISHIHARA Hiroshi

    (50)　80-81　2007/05/10

    ISSN： 0910-2205

  14. Coordination Geometry of Uranium-Thiocyanate Complexes Forming Room Temperature Ionic Liquids

    Aoyagi Noboru, Shimojo Kojiro, Nagaishi Ryuji, Toraishi Takashi, Watanabe Masayuki, Kimura Takaumi

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan　2007　(0)　615-615　2007

    Publisher: Atomic Energy Society of Japan

    DOI： 10.11561/aesj.2007f.0.615.0 　

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    チオシアン酸塩を配位子としたランタノイド錯体をアニオンとしたイオン液体が形成されることが知られている。本研究ではウラニルイオンを構成アニオンとして含有するイオン液体の合成をおこない、その分光特性および構造評価を行った。

  15. Solvent extraction of Am(III) and Eu(III) with tris(2-pyridyl)carbinol as nitrogen-donor ligand.

    K Ishimori, M Watanabe, T Kimura, M Murata, H Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　227　U1275-U1275　2004/03

    ISSN： 0065-7727

  16. Synthesis, structures, and properties of lanthanide dinuclear complexes of tris(2-pyridyl)carbinol with a novel coordination mode.

    M Watanabe, T Nankawa, K Namiki, M Murata, T Kimura, A Nakamura, H Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　227　U1437-U1437　2004/03

    ISSN： 0065-7727

  17. Molecular structure and physical properties of lanthanide-quinone complexes

    T Nankawa, M Watanabe, M Murata, H Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　225　U43-U43　2003/03

    ISSN： 0065-7727

  18. Synthesis and properties of tris(2-pyridine)carbinol lanthanide complexes

    M Watanabe, T Nankawa, T Yamada, T Kimura, A Nakamura, H Nishihara, S Tachimori

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　225　U43-U43　2003/03

    ISSN： 0065-7727

  19. Selective extraction of Am(III) over lanthanides(III) by synergistic system of TPEN and acidic extractants in alcoholic solvents.

    M Watanabe, R Mirvaliev, S Tachimori, K Takeshita, Y Nakano, K Morikawa, R Mori

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　225　U971-U971　2003/03

    ISSN： 0065-7727

  20. 含窒素錯形成剤とリン酸系抽出剤を用いた環境汚染金属の高選択抽出

    竹下健二, 渡辺邦男, 中野義夫, 館盛勝一, 渡邉雅之

    化学工学会第35回秋季大会　35th　E321　2002

  21. 6 座配位子TPEN を用いたAm の抽出

    渡邉雅之, 館盛勝一, 竹下健二, 中野義夫, RinatMirvakiev, 森川公私, 森

    日本原子力学会２００２年春の年会　K40　2002

  22. TPEN によるAm(III)の抽出とそのメカニズム

    渡邉雅之, RinatMirvaliev, 館盛勝一, 竹下健二, 中野義夫, 森川公私, 森良平

    日本原子力学会２００２年秋の大会　F20　2002

  23. TPENによるAm(III)および希土類元素の抽出とそのメカニズム

    渡邉雅之, リナートミルヴァリエフ, 館盛勝一, 竹下健二, 中野義夫, 森川公私, 森良平

    第21回日本溶媒抽出討論会　S-205　2002

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Books and Other Publications 4

  1. トリウム、プルトニウムおよびMAの化学

    佐藤, 修彰, 桐島, 陽, 渡邉, 雅之(放射化学), 佐々木, 隆之, 上原, 章寛, 武田, 志乃, 北辻, 章浩, 音部, 治幹, 小林, 大志

    東北大学出版会　2022/03

    ISBN: 9784861633706

  2. ウランの化学（Ⅱ）方法と実践

    佐藤, 修彰, 桐島, 陽, 渡邉, 雅之(放射化学), 佐々木, 隆之, 上原, 章寛, 武田, 志乃

    東北大学出版会　2021/03

    ISBN: 9784861633560

  3. ウランの化学（Ⅰ）基礎と応用

    佐藤, 修彰, 桐島, 陽, 渡邉, 雅之(放射化学)

    東北大学出版会　2020/06

    ISBN: 9784861633454

  4. 未来を拓く元素戦略 : 持続可能な社会を実現する化学

    日本化学会

    化学同人　2013/01

    ISBN: 9784759813715

Research Projects 5

  1. Redox-induced aggregation and dissolution of actinide nanoparticle

    KITATSUJI Yoshihiro, Watanabe Masayuki, Otobe Haruyoshi, Ouchi Kazuki

    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: Japan Atomic Energy Agency

    2015/04/01 - 2019/03/31

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    The mechanism of the complex reaction combining the two reaction of reduction and aggregation of actinide in solution was elucidated by electrochemical analysis. It has been observed that the reduction rate of uranium(V) ion increases when the colloid of a tetravalent uranium formed by reduction precipitate is present. It was clarified that this catalytic effect can be observed also when zirconium tetravalent hydroxide colloids coexist in addition to uranium. It was also clarified that there is a clear difference in the electrolytic deposition behavior between uranium and neptunium, and that this difference is due to the electrochemical characteristics of the deposited chemical species.

  2. Speciation analysis on actinide ions using non-linear spectroscopy

    Kimura Takaumi, KUSAKA Ryoji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Japan Atomic Energy Agency

    2014/04/01 - 2017/03/31

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    Many of the important issues in the field of nuclear energy are deeply related to chemical reactions occurring at the two-phase interfaces of solid, liquid and gas. However, it is difficult to directly obtain microscopic information on the chemical reactions occurring at the interfaces with conventional experimental methods. In the present study, we adopted an advanced second-order nonlinear vibrational spectroscopic technique, i.e., heterodyne-detected vibrational sum-frequency generation spectroscopy (HD-VSFG), and this enabled us to study the atomic and molecular structures at the interfaces related to solvent extraction separation and actinide chemistry, etc. that are significant in the field of nuclear energy.

  3. Development of the separation of nuclides by using nano-diamonds

    WATANABE Masayuki, KANEKO Junichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Japan Atomic Energy Agency

    2012/04/01 - 2016/03/31

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    In this study, we had focused on the adsorption of metal cation onto diamond surface. Objectives of this study is to elucidate the mechanism on the adsorption of rare earth cations, which is contained into the high level liquid waste generated by reprocessing spent nuclear fuels. Based on the dependence of acidity on the distribution coefficient of rare earth cations, and analysis of the adsorption isotherms and/or adsorption capacity, the adsorption of rare earth is mono-layer plain adsorption and the 1:1 stoichiometric proportion of the adsorption with ionic bonding nature. The investigation by XPS, FT-IR and TRLFS indicated the consistent results with the mechanism which stated above.

  4. Innovation and Utilization of New Amide Complexes for Tc and Re

    OZAWA Masaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    2009/05/11 - 2014/03/31

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    MIDOA(2,2'-(Methylimino)bis(N,N-dioctylacetamide)), whose structural formulae is CH3N-(CH2CON(C8H17)2)2, has a high solubility in n-dodecane, and shows the very high distribution ratio over 100, for Pd(II), Tc(VII) and Re(VII) from diluted HNO3 to n-dodecane. The D values decrease gradually with HNO3 concentration.The EXAFS suggests that, the chemical state of M(VII)O4- is kept during the extraction process. The results of 1H-NMR and EXAFS assured the formation of the M(VII)O4-vs.H+MIDOA complex in the organic solution.Comparison of the observed and calculated IR spectra elucidated that an intramolecular hydrogen bond was formed in H+MIDOA and the M(VII)O4 ion interact with H+MIDOA through multiple C-Hnvs.O hydrogen bonds. The transmutation feasibility of highly radioactive FP(e.g.,Ba) to non radioactve rare earth(e.g., La) was suggested by neutron capture reaction.

  5. Buildup of Precise Separation System of Nuclides with Nanopore Materials

    WATANABE Masayuki, ARISAKA Makoto

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    2009 - 2011

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    We found out that the separation system of actinides could be architected in terms of carbon materials and the combination of single-nano size pores and functional groups were important key factors for the selective separation.