J-GLOBAL         Last updated: May 3, 2019 at 18:02

Research Areas


Academic & Professional Experience

Apr 2019
fellow, Toyota Physical and Chemical Research Institute
Apr 2014
Mar 2019
Research Professor, Chiba University
Apr 2014
Aug 2018
Inspector General, Japan Society for the Promotion of Science
Apr 1996
Mar 2014
Professor, Chiba University
Apr 1991
Mar 1996
Associate Professor, Yokohama National University
Aug 1974
Mar 1991
Assistant professor, Gakushuin University


Graduate School, Division of Natural Science, The University of Tokyo
Faculty of Science, The University of Tokyo

Published Papers

Crystal Polymorphism of 1-butyl-3-methylimidazolium hexafluorophosphate: Phase diagram, structure and dynamics.
Takatsugu Endo, Kozo Fujii, Keiko Nishikawa
Australian J. Chem.   72 11-20   Jan 2019   [Refereed]
Fluctuations and Mixing State of an Aqueous Solution of Ionic Liquid Tetrabutylphosphonium Trifluoroacetate around the Critical Point.
Ayako Nitta, Takeshi Morita, Hiroyuki Ohno, Keiko Nishikawa
Australian J. Chem.   72 93-100   Jan 2019   [Refereed]
Effects of ionic liquid constituent cations, tetraalkylammoniums, on water studied by means of the “1-propanol probing methodology”.
Kazuki Yonenaga, Takeshi Morita, Keiko Nishikawa and Yoshikata Koga
J. Mol. Liq.   252 58-61   2018   [Refereed]
Reduction of mesoscopic structural fluctuation of liquid water induced by the large amphiphilicity of ionic liquid cations
Takeshi Morita, Kazuki Yonenaga, Ayako Nitta, Satoshi Shibuta and Keiko Nishikawa
J. Mol. Liq.   272 425-429   2018   [Refereed]
Growth Behavior of Gold Nanorods Synthesized by the Seed-mediated Method: Tracking of Reaction Progress by Time-resolved X-ray Absorption Near-Edge Structure, Small-Angle X-ray Scattering, and Ultraviolet-Visible Spectroscopy
Yoshikiyo Hatakeyama, Koh Sasaki, Ken Judai, Keiko Nishikawa, and Kazuyuki Hino
J. Phys. Chem. C   122 7982-7991   2018   [Refereed]
Effects of H+ and OH– on H2O as Probed by the 1-Propanol Probing Methodology: Differential  Thermodynamic Approach.
Yoshikata Koga, Kumiko Miki, and Keiko Nishikawa
Phys. Chem. Chem. Phys.   19 27413-27420   2017   [Refereed]
Mixing scheme of an aqueous solution of tetrabutylphosphonium trifluoroacetate in the water-rich region.
Ayako Nitta, Takeshi Morita, Keiko Nishikawa, and Yoshikata Koga
Phys. Chem. Chem. Phys.   19 16888-16879   2017   [Refereed]
Spectra of Excess Molar Absorptivity of Aqueous Solutions of Ionic Liquids: Universal Chromophores for Aqueous Electrolytes?
Fumie Sebe, Keiko Nishikawa, and Yoshikata Koga
J. Mol. Liq.   238 570-574   2017   [Refereed]
Fluctuational parameters based on the Bhatia–Thornton theory for supercritical solutions: Application to a supercritical aqueous solution of n-pentane.
Satoshi Shibuta, Hiroshi Imamura, Keiko Nishikawa and Takeshi Morita
Chem. Phys.   487 30-37   2017   [Refereed]
Band shift and bandwidth broadening in Raman spectra of CO2 induced by absorption into an imidazolium-based ionic liquid, 1-ethyl-3-methylimidazolium tetrafluoroborate, up to 15 MPa
Sakitada Suzuki, Shuhei Okumura, Keiko Nishikawa, Hideyuki Nakayama, Takeshi Morita
Chem. Phys. Lett.   684 346-350   2017   [Refereed]
NMR Study on Ion Dynamics and Phase Behavior of a Piperidinium-Based Room-Temperature Ionic Liquid: 1-Butyl-1-methylpiperidinium Bis(fluorosulfonyl)amide.
Yuichi Shimizu, Yuto Wachi, Kozo Fujii, the late Mamoru Imanari, and Keiko Nishikawa
J. Phys. Chem. B   120 5710-5719   2016   [Refereed]
Temperature-independent formation of Au nanoparticles in ionic liquids by arc plasma deposition.
Yoshikiyo Hatakeyama, Satoshi Kimura, Tatsuya Kameyama, Yoshiaki Agawa, Hiroyuki Tanaka, Ken Judai, Tsukasa Torimoto and Keiko Nishikawa
Chem. Phys. Lett.   658 188-191   2016   [Refereed]
Anion and Cation Effects on Size Control of Au Nanoparticles Prepared by Sputter Deposition in Imidazolium-based Ionic Liquids.
Yoshikiyo Hatakeyama, Ken Judai, Kei Onishi, Satoshi Takahashi, Satoshi Kimura, Keiko Nishikawa
Phys. Chem. Chem. Phys.   18 2339-2349   2016   [Refereed]
Phase Behavior of a Piperidinium-Based Room-Temperature Ionic Liquid Exhibiting Scanning Rate Dependence.
Yuichi Shimizu, Kozo Fujii, Mamoru Imanari, Keiko Nishikawa
J. Phys. Chem. B   119 12552-12560   2015   [Refereed]
Asphaltene Aggregation Behavior in Bromobenzene Determined By Small-angle X-ray Scattering
Masato Morimoto, Hiroshi Imamura, Satoshi Shibuta, Takeshi Morita, Keiko Nishikawa, Hideki Yamamoto, Ryuzo Tanaka, Toshimasa Takanohashi
Energy and Fuels   29 5737-5743   2015   [Refereed]
Excess Partial Molar Absorptivity of Aqueous Solutions of KCl, KBr, CsCl and CsBr: Are There Three Universal Chromophores in the Excess Molar Absorptivity of the 3 Band of H2O for Aqueous Salt Solutions?
Fumie Sebe, Keiko Nishikawa, Yoshikata Koga
J. Sol. Chem.   44 1833-1843   2015   [Refereed]
Absorption- and Pressure-Induced Structural Transition Exhibiting V-shaped Density Change in Imidazolium-based Ionic Liquid + CO2 System.
Shuhei Okumura, Masayoshi Ushio, Akina Oishi, Keiko Nishikawa, Takeshi Morita
Chem. Lett.   35 937-939   2015   [Refereed]
Structure and Dynamics of Room Temperature Ionic Liquids with Bromide Anion: Results from 81Br NMR Spectroscopy.
Takatsugu Endo,* Mamoru Imanari, Yuki Hidaka, Hiroko Seki, Keiko Nishikawa, Sabyasachi Sen
Magn. Reson. Chem.   53 369-378   2015   [Refereed]
Anion and Cation Dynamics of Sulfonylamide-Based Ionic Liquids and the Solid-Liquid Transitions.
Mamoru Imanari, Kozo Fujii, Tomohiro Mukai, Noriko Mizushima, Hiroko Seki, Keiko Nishikawa
Phys. Chem. Chem. Phys.   17 8750-8757   2015   [Refereed]
Density fluctuations in Aqueous Solution of Ionic Liquid with Lower Critical Solution Temperature: Mixture of Tetrabutylphosphonium Trifluoroacetate and Water.
Ayako Nitta, Takeshi Morita, Shohei Saita, Yuki Kohno, Hiroyuki Ohno, Keiko Nishikawa
Chem. Phys. Lett.   628 108-112   2015   [Refereed]


How are Hydrogen Bonds Perturbed in Aqueous NaCl04 Solution Depending on the Concentration?: A Near Infrared Study of Water.
J. Sol. Chem.   33 685-694   2004
J. Phys. Chem.   108(10) 1635-1637   2004

Books etc

Carbon Alloys ―Novel Concepts to Development Carbon Science and Technology ―
NISHIKAWA Keiko (Part:Contributor, Studies on Pore Structure of Carbon Materials by Small-Angle X-ray Scattering. p. 175-188)
Elsevier   2003   
Pore Structure Analyses of Carbons by Small-Angle X-ray Scattering (in CARBON ALLOYS)
ELSEVIER   2003   
Gas-Phase X-ray Diffraction.
Verlag Chemie   1988   
Studies of Rapid Structure Change in Phase Transitions Using Energy-Dispersive X-ray Diffractometry.
KTK Scientific Publishers, (Tokyo)   1986   

Association Memberships


Research Grants & Projects

Study on structure and fluctuation of liquids and solutions
Study on structure and fluctuation of supercritical fluids by diffraction methods.
structural study on porous materials