Dual-layer asymmetric hollow fiber membranes

Li, D.F. Chung, T.S. Wang, R. Liu, Y. Fabrication of fluoropolyimide polyethersulfone (PES) dual layer asymmetric hollow fiber membranes for gas separation. Journal of Membrane Science 2002, 198, 211-223. 

Jiang LY, Chung TS, Cao C, Huang Z, Kulprathipanja S. Fundamental understanding of nano-sized zeolite distribution in the formation of the mixed-matrix single and dual-layer asymmetric hollow fiber membranes. J Membr Sci 2005 252(l-2) 89-100. 

Li, D. R, Chung, T. S., Wang, R., and Liu, Y. (2002). Fabrication of fluoropolyimide/ polyethersul-fone dual-layer asymmetric hollow fiber membranes for gas separation. J. Membr. Sci. 198, 211. Li, D. R, Chung, T. S., and Wang, R. (2004a). Morphological aspects and structure control of duallayer asymmetric hollow fiber membranes formed by a simultaneous co-extrusion approach. J. Membr. Sci. 243, 155. 

D. Li, T.S. Chung, and R. Wang. (2004). Morphological aspects and structure control of dual-layer asymmetric hollow fiber membranes formed by a simultaneous co-extrusion approach, /. Memb. Sci. 243 155-175. 

Compared with single-layer asymmetric hollow-fiber membranes, the dual-layer ones spun fiom a simultaneous extmsion process are more attractive because of the following reasons ... 

The study of dual-layer asyimnetric hollow-fiber membranes formed by the phase-inversion process started in the late 1980s. In 1987, Yanagimoto invented dual-layer asymmetric flat-sheet and hollow-fiber membranes to improve the antifouling properties of membranes for ultrafiltration and microfiltration (Yanagimoto, 1987, 1988). Since then, Kuzumoto and Nitta (1989) simultaneously extruded inner and outer dopes containing the same polymer but different solvents and additives to improve water permeability. Ekiner et al. (1992) disclosed the procedures for the fabrication of dual-layer hollow fibers for gas separation. Li et al. (2002) developed a delamination-fiee dual-layer asymmetric... 

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