World's Best Scientists 2026 revealed!
Keiko Nishikawa

Keiko Nishikawa

D-Index & Metrics

Chemistry

D-Index
56
Citations
9046
World Ranking
11867
National Ranking
881

Keiko Nishikawa publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Keiko Nishikawa sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 252 publications — 50th percentile

50% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

Keiko Nishikawa D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Keiko Nishikawa sits on this spectrum.

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 56 D-Index — 36th percentile

36% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

Overview

Keiko Nishikawa is a researcher affiliated with Chiba University in Japan, specializing in materials science and chemical engineering. Their work primarily spans the subfields of materials chemistry, catalysis, and biomedical engineering, with a notable focus on the properties and applications of ionic liquids as well as material dynamics and phase equilibria.

Their research output includes studies in several specialized topics such as ionic liquids properties and applications, material dynamics and properties, phase equilibria and thermodynamics, thermodynamic properties of mixtures, molecular spectroscopy and chirality, advanced battery materials and technologies, and solid-state spectroscopy and crystallography.

Frequent publication venues for Nishikawa's work include:

  • Bulletin of the Chemical Society of Japan
  • Physical Chemistry Chemical Physics
  • J - Multidisciplinary Scientific Journal
  • Chemical Physics Letters
  • Japanese Journal of Applied Physics

The scientist has collaborated regularly with colleagues such as Kozo Fujii, Takeshi Morita, Masahiro Yoshizawa-Fujita, Taisei Yamada, and Kazuhiko Matsumoto.

Their recent publications illustrate a range of topics across experimental and theoretical studies, including:

  • "Structure and Properties of Supercritical Water: Experimental and Theoretical Characterizations," 2021, published in J - Multidisciplinary Scientific Journal
  • "Two different regimes in alcohol-induced coil-helix transition: effects of 2,2,2-trifluoroethanol on proteins being either independent of or enhanced by solvent structural fluctuations," 2021, published in Physical Chemistry Chemical Physics
  • "The Solution Chemistry of Mixing States Probed via Fluctuations: a Direct Description of Inhomogeneity in Mixing," 2021, published in Bulletin of the Chemical Society of Japan
  • "Free ionic rotators on crystal lattice points - Structures of ionic plastic crystals," 2022, published in Chemical Physics Letters
  • "Heterogeneous dynamics of diffusive motion in organic ionic plastic crystal studied using spin-spin relaxation time: N,N-diethylpyrrolidinium bis(fluorosulfonyl)amide," 2024, published in Bulletin of the Chemical Society of Japan

Keiko Nishikawa's multidisciplinary research integrates approaches from engineering and chemical sciences to explore the behavior of complex materials, addressing both fundamental properties and advanced applications related to ionic liquids and thermodynamic systems.

Best Publications

  • Structure of an ionic liquid, 1-n-butyl-3-methylimidazolium iodide, studied by wide-angle X-ray scattering and Raman spectroscopy

    Hideki Katayanagi;Satoshi Hayashi;Hiro-o Hamaguchi;Keiko Nishikawa

  • An Ordered Water Molecular Assembly Structure in a Slit-Shaped Carbon Nanospace

    T. Iiyama;K. Nishikawa;T. Otowa;K. Kaneko

  • Mixing Schemes in Ionic Liquid−H2O Systems: A Thermodynamic Study

    Hideki Katayanagi;Keiko Nishikawa;Hideki Shimozaki;Kumiko Miki

  • Temperature dependence of the concentration fluctuation, the Kirkwood-Buff parameters, and the correlation length of tert-butyl alcohol and water mixtures studied by small-angle x-ray scattering

    Keiko Nishikawa;Hisashi Hayashi;Takao Iijima

  • Study of the structure of a water molecular assembly in a hydrophobic nanospace at low temperature with in situ X-ray diffraction

    T. Iiyama;K. Nishikawa;T. Suzuki;K. Kaneko

  • Small-angle x-ray scattering study of fluctuations in 1-propanol-water and 2-propanol-water systems

    Hisashi. Hayashi;Keiko. Nishikawa;Takao. Iijima

  • Melting and freezing behaviors of prototype ionic liquids, 1-butyl-3-methylimidazolium bromide and its chloride, studied by using a nano-Watt differential scanning calorimeter.

    Keiko Nishikawa;Shaolan Wang;Hideki Katayanagi;Satoshi Hayashi

  • Small-angle x-ray scattering study of fluctuations in ethanol and water mixtures

    Keiko Nishikawa;Takao Iijima

  • CORRELATION LENGTHS AND DENSITY FLUCTUATIONS IN SUPERCRITICAL STATES OF CARBON DIOXIDE

    Keiko Nishikawa;Ibuki Tanaka

  • Inhomogeneity of molecular distribution in supercritical fluids

    Keiko Nishikawa;Takeshi Morita

  • Fluctuations in the particle number and concentration and the Kirkwood-Buff parameters of tert-butyl alcohol and water mixtures studied by small-angle x-ray scattering

    Keiko. Nishikawa;Yasuto. Kodera;Takao. Iijima

  • Small-Angle X-ray Scattering Study of Supercritical Carbon Dioxide

    Keiko Nishikawa;Ibuki Tanaka;Yoshiyuki Amemiya

  • Study of inhomogeneity of supercritical water by small-angle x-ray scattering

    Takeshi Morita;Kohei Kusano;Hiroto Ochiai;Ken-ichi Saitow

  • Corrections for Intensity Data in Energy-dispersive X-Ray Diffractometry of Liquids. Application to Carbon Tetrachloride

    Keiko Nishikawa;Takao Iijima

  • Effect of an “Ionic Liquid” Cation, 1-Butyl-3-methylimidazolium, on the Molecular Organization of H2O

    Kumiko Miki;Peter Westh;Keiko Nishikawa;Yoshikata Koga

  • Effects of sputtering conditions on formation of gold nanoparticles in sputter deposition technique

    Yoshikiyo Hatakeyama;Kei Onishi;Keiko Nishikawa

  • Phase Behaviors of Room Temperature Ionic Liquid Linked with Cation Conformational Changes: 1-Butyl-3-methylimidazolium Hexafluorophosphate

    Takatsugu Endo;Tatsuya Kato;Ken-ichi Tozaki;Keiko Nishikawa

  • Effects of Methylation at the 2 Position of the Cation Ring on Phase Behaviors and Conformational Structures of Imidazolium-Based Ionic Liquids

    Takatsugu Endo;Tatsuya Kato;Keiko Nishikawa

  • Synthesis of Gold Nanoparticles in Liquid Polyethylene Glycol by Sputter Deposition and Temperature Effects on their Size and Shape

    Yoshikiyo Hatakeyama;Takeshi Morita;Satoshi Takahashi;Kei Onishi

  • Small-Angle X-ray Scattering Study of Au Nanoparticles Dispersed in the Ionic Liquids 1 -Alkyl-3-methylimidazolium Tetrafluoroborate

    Yoshikiyo Hatakeyama;Maimi Okamoto;Tsukasa Torimoto;Susumu Kuwabata

Frequent Co-Authors

Peter Westh
Peter Westh Technical University of Denmark
Kozo Fujii
Kozo Fujii Tokyo University of Science
Katsumi Kaneko
Katsumi Kaneko Shinshu University
S. Sen
S. Sen University of California, Davis
Hideaki Shirota
Hideaki Shirota Chiba University
Akiko Kobayashi
Akiko Kobayashi Nihon University
Hiroyuki Ohno
Hiroyuki Ohno Tokyo University of Agriculture and Technology
Hiro-o Hamaguchi
Hiro-o Hamaguchi National Yang Ming Chiao Tung University
Kiyotaka Asakura
Kiyotaka Asakura Hokkaido University
Kazuyuki Tohji
Kazuyuki Tohji Tohoku University

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