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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 66 7170 6498 36 36 311 20674

Geert-Jan Witkamp publications per year

The chart shows the history of publications by Geert-Jan Witkamp between 1971 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Geert-Jan Witkamp published across 55 years, from 1971 to 2025, averaging 6.3 papers a year. Output peaked at 29 publications in 2005. 10 of the 349 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1971 to 2025. Vertical axis: number of publications, 0 to 29. Peak 29 publications in 2005. 1971: 1 publication 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 0 publications 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 0 publications 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 1 publication 1987: 1 publication 1988: 0 publications 1989: 2 publications 1990: 3 publications 1991: 1 publication 1992: 1 publication 1993: 5 publications 1994: 1 publication 1995: 0 publications 1996: 4 publications 1997: 2 publications 1998: 7 publications 1999: 20 publications 2000: 15 publications 2001: 7 publications 2002: 16 publications 2003: 11 publications 2004: 13 publications 2005: 29 publications 2006: 15 publications 2007: 20 publications 2008: 24 publications 2009: 12 publications 2010: 21 publications 2011: 23 publications 2012: 12 publications 2013: 14 publications 2014: 9 publications 2015: 7 publications 2016: 3 publications 2017: 3 publications 2018: 4 publications 2019: 8 publications 2020: 5 publications 2021: 8 publications 2022: 2 publications 2023: 9 publications 2024: 6 publications 2025: 4 publications
1971 2025

349 publications in total across all disciplines

View publications per year as a table
Geert-Jan Witkamp: publications per year, 1971 to 2025
Year Publications
1971 1
1972 0
1973 0
1974 0
1975 0
1976 0
1977 0
1978 0
1979 0
1980 0
1981 0
1982 0
1983 0
1984 0
1985 0
1986 1
1987 1
1988 0
1989 2
1990 3
1991 1
1992 1
1993 5
1994 1
1995 0
1996 4
1997 2
1998 7
1999 20
2000 15
2001 7
2002 16
2003 11
2004 13
2005 29
2006 15
2007 20
2008 24
2009 12
2010 21
2011 23
2012 12
2013 14
2014 9
2015 7
2016 3
2017 3
2018 4
2019 8
2020 5
2021 8
2022 2
2023 9
2024 6
2025 4
Total 349
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Geert-Jan Witkamp 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 Geert-Jan Witkamp 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, 301–320 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: 311 publications — 66th percentile

66% 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
261–280 979
281–300 939
301–320 764 311
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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Geert-Jan Witkamp 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 Geert-Jan Witkamp 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, 66–67 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: 66 D-Index — 60th percentile

60% 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
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775 66
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

Geert-Jan Witkamp is affiliated with King Abdullah University of Science and Technology in Saudi Arabia. Their research spans engineering and environmental science, with significant contributions in related subfields including biomedical engineering, renewable energy, sustainability, water science and technology, catalysis, and industrial and manufacturing engineering.

The scientist's body of work is frequently published in journals such as the Journal of Molecular Liquids, Journal of Water Process Engineering, Chemical Engineering Journal, Journal of Environmental Chemical Engineering, and SSRN Electronic Journal.

Key topics in their research include ionic liquids properties and applications, membrane separation technologies, phosphorus and nutrient management, chemical and physical properties in aqueous solutions, solar-powered water purification methods, membrane-based ion separation techniques, and layered double hydroxides synthesis and applications.

Recent publications feature studies on natural deep eutectic solvents and their applications:

  • Solubility and Stability of Some Pharmaceuticals in Natural Deep Eutectic Solvents-Based Formulations, 2021, Molecules
  • Natural deep eutectic solvents as biofilm structural breakers, 2021, Water Research
  • Structural properties and stability of the Betaine-Urea natural deep eutectic solvent, 2021, Journal of Molecular Liquids
  • A Super-Hygroscopic Solar-Regenerated Alginate-Based Composite for Atmospheric Water Harvesting, 2024, Small
  • The role of ionic liquid pretreatment and recycling design in the sustainability of a biorefinery: a sugarcane to ethanol example, 2021, Green Chemistry

Frequent co-authors collaborating with Witkamp include Andreia S.F. Farinha, Robert Verpoorte, Young Hae Choi, Johannes S. Vrouwenvelder, and Lamya Al Fuhaid, indicating a consistent pattern of collaboration in their research projects.

Best Publications

  • Natural deep eutectic solvents as new potential media for green technology.

    Yuntao Dai;Jaap van Spronsen;Geert Jan Witkamp;Robert Verpoorte

  • Are natural deep eutectic solvents the missing link in understanding cellular metabolism and physiology

    Young Hae Choi;Jaap van Spronsen;Yuntao Dai;Marianne Verberne

  • Tailoring properties of natural deep eutectic solvents with water to facilitate their applications

    Yuntao Dai;Geert-Jan Witkamp;Robert Verpoorte;Young Hae Choi

  • Mineral CO2 sequestration by steel slag carbonation.

    Wouter J. J. Huijgen;Geert-Jan Witkamp;Rob N. J. Comans

  • Natural Deep Eutectic Solvents as a New Extraction Media for Phenolic Metabolites in Carthamus tinctorius L.

    Yuntao Dai;Geert-Jan Witkamp;Robert Verpoorte;Young Hae Choi

  • The Relevance of Phosphorus and Iron Chemistry to the Recovery of Phosphorus from Wastewater: A Review

    Philipp Wilfert;Prashanth Suresh Kumar;Leon Korving;Geert-Jan Witkamp

  • Ionic Liquids and Deep Eutectic Solvents in Natural Products Research: Mixtures of Solids as Extraction Solvents

    Yuntao Dai;Jaap Van Spronsen;Geert Jan Witkamp;Robert Verpoorte

  • Mechanisms of aqueous wollastonite carbonation as a possible CO2 sequestration process

    Wouter J.J. Huijgen;Geert-Jan Witkamp;Rob N.J. Comans;Rob N.J. Comans

  • Adsorption as a technology to achieve ultra-low concentrations of phosphate: Research gaps and economic analysis.

    Prashanth Suresh Kumar;Leon Korving;Mark C.M. van Loosdrecht;Geert-Jan Witkamp;Geert-Jan Witkamp

  • Effect of pore size distribution and particle size of porous metal oxides on phosphate adsorption capacity and kinetics

    Prashanth Suresh Kumar;Leon Korving;Karel J. Keesman;Mark C.M. van Loosdrecht

  • Quantum chemical aided prediction of the thermal decomposition mechanisms and temperatures of ionic liquids

    Maaike C. Kroon;Wim Buijs;Cor J. Peters;Geert-Jan Witkamp

  • Cost evaluation of CO2 sequestration by aqueous mineral carbonation

    Wouter J.J. Huijgen;Rob N.J. Comans;Rob N.J. Comans;Geert-Jan Witkamp

  • Vivianite as the main phosphate mineral in digested sewage sludge and its role for phosphate recovery

    P. Wilfert;A.I. Dugulan;K. Goubitz;L. Korving

  • Energy consumption and net CO2 sequestration of aqueous mineral carbonation

    Wouter J. J. Huijgen;Gerrit Jan Ruijg;Rob N. J. Comans;Geert-Jan Witkamp

  • Vivianite as an important iron phosphate precipitate in sewage treatment plants.

    P. Wilfert;A. Mandalidis;A.I. Dugulan;K. Goubitz

  • Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer.

    Xingkai Xu;Wangzhao Zhu;Zijian Wang;Geert-Jan Witkamp

  • Decomposition of ionic liquids in electrochemical processing

    Maaike C. Kroon;Wim Buijs;Cor J. Peters;Geert-Jan Witkamp

  • Modeling of the carbon dioxide solubility in imidazolium-based ionic liquids with the tPC-PSAFT equation of state.

    Maaike C Kroon;Eirini K Karakatsani;Ioannis G Economou;Geert-Jan Witkamp

  • High-pressure phase behavior of systems with ionic liquids: Part V. The binary system carbon dioxide+1-butyl-3-methylimidazolium tetrafluoroborate

    M.C. Kroon;A. Shariati Sarabi;M. Costantini;J. van Spronsen

  • Dyeing of natural and synthetic textiles in supercritical carbon dioxide with disperse reactive dyes

    M. van der Kraan;M.V. Fernandez Cid;G.F. Woerlee;W.J.T. Veugelers

Frequent Co-Authors

Cor J. Peters
Cor J. Peters Colorado School of Mines
Robert Verpoorte
Robert Verpoorte Leiden University
Maria D. Kennedy
Maria D. Kennedy IHE Delft Institute for Water Education
Wim Jiskoot
Wim Jiskoot Leiden University
Daan J.A. Crommelin
Daan J.A. Crommelin Utrecht University
Gary L. Amy
Gary L. Amy Clemson University
Young Hae Choi
Young Hae Choi Leiden University
Jan C. Schippers
Jan C. Schippers IHE Delft Institute for Water Education
Rob N.J. Comans
Rob N.J. Comans Wageningen University & Research
Johannes S. Vrouwenvelder
Johannes S. Vrouwenvelder King Abdullah University of Science and Technology

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