Susanti, Ratna F. Han, Yang Soo Kim, Jaehoon Lee, Young Haeng Carbonell, Ruben G. 2024-01-20T11:35:04Z 2024-01-20T11:35:04Z 2021-09-05 2013-08-01 0376-7388 https://pubs.kist.re.kr/handle/201004/127783 Highly stable, uniform and ultrathin hydrophilic polymer coatings on the surface as well as in the pores of a PVDF microfiltration (MF) membrane are obtained by coating a hydrophilic monomer in liquid carbon dioxide (l-CO2) followed by subsequent crosslinking reaction. Polyethylene glycol diacrylate (PEGDA, M-n similar to 258 g/mol) is used as the l-CO2 soluble hydrophilic monomer source and azobisisobutyronitrile (AIBN) was used as a radical initiator. The extremely low surface tension and the low viscosity of l-CO2 result in ultrathin and uniform PEG coatings on the hydrophobic polyvinylidene fluoride (PVDF) microfiltration membrane. The chemical composition, morphology, and the depth profiles of the PEG-coated membranes are characterized in detail using X-ray photoelectron spectroscopy, scanning electron microscopy, electron probe microanalysis and energy dispersive X-ray microanalysis. Long-term permeation flux test using a bovine serum albumin solution shows that the 1.0 wt% PEGDA-coated membrane using l-CO2 exhibits 1.34 times larger BSA solution flux than that of the uncoated PVDF membrane, and 1.3 times larger flux than that of a commercial hydrophilic membrane. Fouling resistance estimation shows that the 1 wt% PEGDA-coated membrane exhibits similar to 30% lower internal fouling resistance than the pristine membrane, and similar to 24% lower internal fouling resistance than the commercial hydrophilic membrane. Crown Copyright (C) 2013 Published by Elsevier BY. All rights reserved. English ELSEVIER SCIENCE BV POLY(VINYLIDENE FLUORIDE) MEMBRANES POLYPROPYLENE MICROPOROUS MEMBRANES CROSS-LINKING APPROACH BOVINE SERUM-ALBUMIN POLY(ETHYLENE GLYCOL) ULTRAFILTRATION MEMBRANES SURFACE MODIFICATION MICROFILTRATION MEMBRANES GRAFT-POLYMERIZATION ANTIFOULING PROPERTY A new strategy for ultralow biofouling membranes: Uniform and ultrathin hydrophilic coatings using liquid carbon dioxide Article 10.1016/j.memsci.2013.03.068 1 JOURNAL OF MEMBRANE SCIENCE, v.440, pp.88 - 97 JOURNAL OF MEMBRANE SCIENCE 440 88 97 scie scopus 000319501500010 2-s2.0-84877053914 Engineering, Chemical Polymer Science Engineering Polymer Science Article POLY(VINYLIDENE FLUORIDE) MEMBRANES POLYPROPYLENE MICROPOROUS MEMBRANES CROSS-LINKING APPROACH BOVINE SERUM-ALBUMIN POLY(ETHYLENE GLYCOL) ULTRAFILTRATION MEMBRANES SURFACE MODIFICATION MICROFILTRATION MEMBRANES GRAFT-POLYMERIZATION ANTIFOULING PROPERTY Hydrophilization Liquid carbon dioxide Coating Biofouling