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Keiko Nishikawa

Keiko Nishikawa

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 56 11867 10691 881 805 252 9046

Keiko Nishikawa publications per year

The chart shows the history of publications by Keiko Nishikawa between 1975 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Keiko Nishikawa published across 52 years, from 1975 to 2026, averaging 5.2 papers a year. Output peaked at 21 publications in 2012. 6 of the 271 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1975 to 2026. Vertical axis: number of publications, 0 to 21. Peak 21 publications in 2012. 1975: 3 publications 1976: 2 publications 1977: 0 publications 1978: 1 publication 1979: 2 publications 1980: 2 publications 1981: 2 publications 1982: 0 publications 1983: 1 publication 1984: 2 publications 1985: 3 publications 1986: 5 publications 1987: 2 publications 1988: 2 publications 1989: 4 publications 1990: 3 publications 1991: 4 publications 1992: 0 publications 1993: 2 publications 1994: 5 publications 1995: 3 publications 1996: 3 publications 1997: 5 publications 1998: 5 publications 1999: 6 publications 2000: 10 publications 2001: 9 publications 2002: 5 publications 2003: 8 publications 2004: 13 publications 2005: 6 publications 2006: 10 publications 2007: 6 publications 2008: 11 publications 2009: 14 publications 2010: 9 publications 2011: 7 publications 2012: 21 publications 2013: 19 publications 2014: 10 publications 2015: 9 publications 2016: 7 publications 2017: 6 publications 2018: 3 publications 2019: 2 publications 2020: 2 publications 2021: 5 publications 2022: 4 publications 2023: 1 publication 2024: 1 publication 2025: 5 publications 2026: 1 publication
1975 2026

271 publications in total across all disciplines

View publications per year as a table
Keiko Nishikawa: publications per year, 1975 to 2026
Year Publications
1975 3
1976 2
1977 0
1978 1
1979 2
1980 2
1981 2
1982 0
1983 1
1984 2
1985 3
1986 5
1987 2
1988 2
1989 4
1990 3
1991 4
1992 0
1993 2
1994 5
1995 3
1996 3
1997 5
1998 5
1999 6
2000 10
2001 9
2002 5
2003 8
2004 13
2005 6
2006 10
2007 6
2008 11
2009 14
2010 9
2011 7
2012 21
2013 19
2014 10
2015 9
2016 7
2017 6
2018 3
2019 2
2020 2
2021 5
2022 4
2023 1
2024 1
2025 5
2026 1
Total 271
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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.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 241–260 publications, is where this scientist sits. 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
61–80 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.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100 252
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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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.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 56–57 D-Index, is where this scientist sits. 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
40–41 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.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051 56
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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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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