Premium
Dynamic pressure‐driven covalent assembly of inner skin hollow fiber multilayer membrane
Author(s) -
Zhang Guojun,
Dai Limin,
Ji Shulan
Publication year - 2011
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12481
Subject(s) - covalent bond , glutaraldehyde , membrane , materials science , chemical engineering , fourier transform infrared spectroscopy , nanometre , fiber , zeta potential , polymer chemistry , nanotechnology , chemistry , composite material , chromatography , organic chemistry , nanoparticle , biochemistry , engineering
A covalent assembly was accomplished onto hollow fibers via a dynamic pressure‐driven layer‐by‐layer (LbL) technique. The covalent crosslinking multilayers were successfully formed onto the inner surfaces of hollow fiber porous substrates during the alternatively filtration of polyethyleneimine (PEI) and glutaraldehyde (GA) solutions. The formation of covalent bond between PEI and GA was confirmed using fourier transform infrared (FTIR) spectra. The thickness increment on a quartz slide clearly suggested the stepwise growth of multilayer at nanometer scale. The regular alternation of zeta potentials demonstrated that the successful formation of GA‐crosslinked PEI multilayers on the hollow fibers. The multilayer membranes showed excellent pervaporation performances for the dehydration of different solvent–water mixtures. The selectivity and permeability can be controlled by varying the PEI layer number. More importantly, the covalent assembled multilayer membrane rendered much higher stabilities compared with those from electrostatically LbL assembly, which offers much opportunity for practical applications. © 2010 American Institute of Chemical Engineers AIChE J, 2011