California NanoSystems Institute
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Yoram Cohen, Ph.D.

Director, Center for Environmental Risk Reduction, Water Technology Research Center
Professor, Chemical and Biomolecular Engineering
Member, California NanoSystems Institute

Ph.D., University of Delaware, 1981
M.A., University of Toronto, 1977
B.A., University of Toronto, 1975

Honors and Awards:
2006 - 2008 AIChE Separations Division, Chair, 1st, and 2nd Vice-Chair
2006 Victoria University (Australia), Distinguished Visiting Professor
2005 - 2007 North American Membrane Society, Board Member
2004 - Water Research Center, Israel Institute of Technology, Member, International Science Advisory Committee
2003 AIChE/Env., Lawrence K. Cecil Award in Environmental Chemical Engineering
2000 - 2002 AIChE Env. Division, Chair, 2nd Vice-Chair, 1st Vice-Chair
2000 - AIChE Environmental Division, Member, Executive Committee

Contact Information:
Email Address:
Work Address: University of California, Los Angeles
5531-E Boelter Hall
Los Angeles, CA 90095
Home Page:
Work Phone Number: (310) 825-8766
Technical Research Interest:

Polymer and Separations
  • Surface nano-structuring with polymers and organosilanes
  • Graft polymerization
  • Membranes:
    Desalination, ultrafiltration and pervaporation
  • Surface crystallization
  • Neural Networks for quantitative-structure property estimation.
  • Intermedia and multimedia transport in environmental systems.
  • Environmental impact assessment

Additional Information:

Dr. Yoram Cohen received his B.A.Sc., M.A.Sc., in 1975 and 1977, respectively, both in Chemical Engineering, from the University of Toronto, and his Ph.D. from the University of Delaware in 1981. He has been on the Faculty of Chemical and Biomolecular Engineering at the University of California, Los Angeles (UCLA) since 1981. He is the founder and Director of the Water Technology Research Center and the Center for Environmental Risk Reduction, and a member of the UCLA/National Science Foundation (NSF) Center for the Environmental Implications of Nanotechnology (CEIN). Dr. Cohen is an Adjunct Professor at Ben-Gurion University and a member of the International Advisory Committee to the Stephen and Nancy Grand Water Research Institute at the Technion. He was a Visiting Professor at the Technion (1987-1988), at Universitat Rovira i Virgili (1944) and a Distinguished Visiting Professor at Victoria University (2006). Dr. Cohen is a UCLA Luskin Scholar and a recipient of the 2008 Ann C. Rosenfield Community Partnership Prize in recognition of his environmental research. He received the 2003 Lawrence K. Cecil award in Environmental Chemical Engineering from the American Institute of Chemical Engineers (AIChE), as well as the AIChE Separations Division Outstanding Paper Award (1997 and 2009). In 2008 he received a County of Los Angeles Commendation (2008), a State of California Senate Certificate of Recognition, and a Certificate of Special Congressional Recognition (US) for contributing to legislation to protect public health and dedicated service to the Los Angeles community. Dr. Cohen has published over one hundred and fifty research papers and book chapters in water technology, separations processes, transport phenomena, polymer science, surface nano-structuring and environmental engineering. He is also the Editor of three environmental volumes. Dr. Cohen developed patented technologies in membrane synthesis, reverse osmosis desalination, surface nanostructuring and chemical sensors. He has served on numerous Government Advisory Committees, and organized over thirty scientific conferences, including the 2008 International Congress on Membranes and membrane processes (ICOM) and the 2009 West Coast Water Technology Transfer workshop. He also was appointed as the Meeting Program Chair of the 2010 AIChE Meeting.

Selected Publications:

Zhang Haiyuan, Ji Zhaoxia, Xia Tian, Meng Huan, Low-Kam Cecile, Liu Rong, Pokhrel Suman, Lin Sijie, Wang Xiang, Liao Yu-Pei, Wang Meiying, Li Linjiang, Rallo Robert, Damoiseaux Robert, Telesca Donatello, Mädler Lutz, Cohen Yoram, Zink Jeffrey I, Nel Andre E, Use of Metal Oxide Nanoparticle Band Gap To Develop a Predictive Paradigm for Oxidative Stress and Acute Pulmonary Inflammation, ACS nano, 2012.
Zhang H, Xia T, Meng H, Xue M, George S, Ji Z, Wang X, Liu R, Wang M, France B, Rallo R, Damoiseaux R, Cohen Y, Bradley KA, Zink JI, Nel AE, Differential Expression of Syndecan-1 Mediates Cationic Nanoparticle Toxicity in Undifferentiated versus Differentiated Normal Human Bronchial Epithelial Cells, ACS Nano, 2011, Epub ahead of print.
Rallo R, France B, Liu R, Nair S, George S, Damoiseaux R, Giralt F, Nel A, Bradley K, Cohen Y, Self-Organizing Map Analysis of Toxicity-Related Cell Signaling Pathways for Metal and Metal Oxide Nanoparticles, Environ Sci Technol, 2011, Epub ahead of print.
George S, Xia T, Rallo R, Zhao Y, Ji Z, Lin S, Wang X, Zhang H, France B, Schoenfeld D, Damoiseaux R, Liu R, Lin S, Bradley KA, Cohen Y, Nel AE, Use of a High-Throughput Screening Approach Coupled with In Vivo Zebrafish Embryo Screening To Develop Hazard Ranking for Engineered Nanomaterials, ACS Nano, 2011, 5 (3), 1805-17.
Kim MM, Lin NH, Lewis GT, Cohen Y, Surface nano-structuring of reverse osmosis membranes via atmospheric pressure plasma-induced graft polymerization for reduction of mineral scaling propensity, JOURNAL OF MEMBRANE SCIENCE , 2010, 354 (1-2), 142-9.
Uchymiak M, Bartman AR, Daltrophe N, Weissman M, Gilron J, Christofides PD, Kaiser WJ, Cohen Y, Brackish water reverse osmosis (BWRO) operation in feed flow reversal mode using an ex situ scale observation detector (EXSOD), JOURNAL OF MEMBRANE SCIENCE, 2009, 341 (1-2), 60-66.
Lyster E, Au J, Rallo R, Giralt F, Cohen Y, Coupled 3-D hydrodynamics and mass transfer analysis of mineral scaling-induced flux decline in a laboratory plate-and-frame reverse osmosis membrane module, JOURNAL OF MEMBRANE SCIENCE, 2009, 339 (1-2), 39-48.
Zhu AZ, Christofides PD, Cohen Y, Effect of Thermodynamic Restriction on Energy Cost Optimization of RO Membrane Water Desalination, Ind. Eng. Chem. Res, 2009, 48 (13), 6010-6021.
Zhu AH, Christofides PD, Cohen Y, Energy Consumption Optimization of Reverse Osmosis Membrane Water Desalination Subject to Feed Salinity Fluctuation, Ind. Eng. Chem. Res, 2009, 48 (21), 9581-9589.
Zhu AH, Christofides PD, Cohen Y, Minimization of energy consumption for a two-pass membrane desalination: Effect of energy recovery, membrane rejection and retentate recycling, JOURNAL OF MEMBRANE SCIENCE, 2009, 339 (1-2), 126-137.
Bartman AR, Christofides PD, Cohen Y, Nonlinear Model-Based Control of an Experimental Reverse-Osmosis Water Desalination System, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2009, 48 (13), 6126-36.
Shemesh N, Ozarslan E, Bar-Shir A, Basser PJ, Cohen Y., Observation of restricted diffusion in the presence of a free diffusion compartment: single- and double-PFG experiments, J Magn Reson, 2009, 200 (2), 214-25.
Zhu AH, Christofides PD, Cohen Y, On RO membrane and energy costs and associated incentives for future enhancements of membrane permeability, JOURNAL OF MEMBRANE SCIENCE , 2009, 344 (1-2), 1-5.
Lewis G., Nguyen V., Shih W., Cohen Y. , Reverse Atom Transfer Radical Graft Polymerization of 4-vinylpyridine onto Inorganic Oxide Surfaces, J. Applied Polymer Science, 2009, 113 (1), 437-449.
Lewis, GT; Cohen, Y , Controlled Nitroxide-Mediated Styrene Surface Graft Polymerization with Atmospheric Plasma Surface Activation, Langmuir, 2008, 24 (22), 13102-13112.
Zach-Maor, A; Semiat, R; Rahardianto, A; Cohen, Y; Wilson, S; Gray, SR , Diagnostic analysis of RO desalting treated wastewater, Desalination, 2008, 230 (1-3), 239-247.
Uchymiak M, Lyster E, Glater J, Cohen Y , Kinetics of gypsum crystal growth on a reverse osmosis membrane, Journal of Membrane Science, 2008, 314 (1-2), 163-172.
Libotean D, Giralt J, Rallo R, Cohen Y, Giralt F, Ridgway HF, Rodriguez G, Phipps D, Organic compounds passage through RO membranes, Journal of Membrane Science, 2008, 313 (1-2), 23-43.
Rahardianto, A. McCool, B. C. Cohen, Y., Reverse osmosis desalting of inland brackish water of high gypsum scaling propensity: Kinetics and mitigation of membrane mineral scaling, Environmental Science & Technology, 2008, 42 (12), 4292-4297.
Uchymiak, M. ,Rahardianto, A., Lyster, E., Glater, J. ,Cohen, Y., A novel RO ex situ scale observation detector (EXSOD) for mineral scale characterization and early detection, Journal of Membrane Science, 2007, 291 (1-2), 86-95.
Gabelich, C.J., Williams, M.D., Rahardianto, A., Franklin, J.C., and Cohen, Y., High-recovery reverse osmosis desalination using intermediate chemical demineralization, J. Membrane Science, 2007, 301, 131-141.
Lewis, G., Nowling, G., Hicks, R.H. and Cohen, Y., Inorganic Surface Nanostructuring by Atmospheric Pressure Plasma-Induced Graft Polymerization, Langmuir, 2007, 23 (21), 10756-10764.
Lyster E, Cohen Y , Numerical study of concentration polarization in a rectangular reverse osmosis membrane channel: Permeate flux variation and hydrodynamic end effects, Journal of Membrane Science, 2007, 303 (1-2), 140-153.
Lewis, G., Nguyen, Van, and Cohen, Y., Synthesis of Poly (4-Vinylpyridine) by Reverse Atom Transfer Radical Polymerization, J. Polymer Science Part A: Polymer Chemistry, 2007, 45 (24), 5748-5758.
Rahardianto A, Shih WY, Lee RW, Cohen Y , Diagnostic characterization of gypsum scale formation and control in RO membrane desalination of brackish water, Journal of Membrane Science, 2006, 279 (1-2), 655-668.
Shih WY, Gao JB, Rahardianto A, Glater J, Cohen Y, Gabelich CJ , Ranking of antiscalant performance for gypsum scale suppression in the presence of residual aluminum, Desalination , 2006, 196 (1-3), 280-292.
Shih WY, Rahardianto A, Lee RW, Cohen Y , Morphometric characterization of calcium sulfate dihydrate (gypsum) scale on reverse osmosis membranes , Journal of Membrane Science, 2005, 252 (1-2), 253-263.
Grifoll J, Gasto JM, Cohen Y , Non-isothermal soil water transport and evaporation, Advances in Water Resources, 2005, 28 (11), 1254-1266.
Shih WY, Albrecht K, Glater J, Cohen Y , A dual-probe approach for evaluation of gypsum crystallization in response to antiscalant treatment , Desalination, 2004, 169 (3), 213-221.
Giralt F, Espinosa G, Arenas A, Ferre-Gine J, Amat L, Girones X, Carbo-Dorca R, Cohen Y , Estimation of infinite dilution activity coefficients of organic compounds in water with neural classifiers, AICHE Journal, 2004, 50 (6), 1315-1343.
Yoshida W, Cohen Y , Removal of methyl tert-butyl ether from water by pervaporation using ceramic-supported polymer membranes, Journal of Membrance Science, 2004, 229 (1-2), 27-32.
Yoshida W, Cohen Y , Ceramic-supported polymer membranes for pervaporation of binary organic/organic mixtures, Journal of Membrane Science, 2003, 213 (1-2), 145-157.
Nguyen V, Yoshida W, Cohen Y , Graft polymerization of vinyl acetate onto silica , Journal of Applied Polymer Science, 2003, 87 (2), 300-310.
Lee RW, Glater J, Cohen Y, Martin C, Kovac K, Milobar MN, Bartel DW , Low-pressure RO membrane desalination of agricultural drainage water, Desalination, 2003, 155 (2), 109-120.
Yoshida W, Cohen Y , Topological AFM characterization of graft polymerized silica membranes, Journal of Membrane Science, 2003, 215 (1-2), 249-264.
Faibish RS, Yoshida W, Cohen Y , Contact angle study on polymer-grafted silicon wafers , Journal of Colloid and Interface Science, 2002, 256 (2), 341-350.
Gasto JM, Grifoll J, Cohen Y , Estimation of internodal permeabilities for numerical simulation of unsaturated flows, Water Resources Research, 2002, 38 (12).