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Title: Evolution of nano-particle distribution during the fabrication of mixed matrix TiO2-polyimide hollow fiber membranes
Authors: Xiao, Y. 
Yu Wang, K. 
Chung, T.-S. 
Tan, J.
Keywords: Elongation
Hollow fiber membrane
Particle distribution
Issue Date: Sep-2006
Citation: Xiao, Y., Yu Wang, K., Chung, T.-S., Tan, J. (2006-09). Evolution of nano-particle distribution during the fabrication of mixed matrix TiO2-polyimide hollow fiber membranes. Chemical Engineering Science 61 (18) : 6228-6233. ScholarBank@NUS Repository.
Abstract: The purpose of this short note is to report, for the first time, the effect of elongational drawing on TiO2 nano-particle distribution in hollow fiber membranes. The results shown in the short manuscript have multiple applications and impact for the fundamental understanding and development of hybrid solid composite fibers and mixed matrix hollow fiber membranes. TiO2 nano-particles with sizes around 300-400 nm are doped directly into the polyimide solution before spinning. The evolution of membrane morphology and nano-particle distribution has been investigated by SEM-EDX with an increase in elongational draw ratio. It is found that TiO2 nano-particle distribution across the membrane wall varies from convex to concave profiles depending on elongational draw ratio. In other words, high elongational draw ratios result in particles moving radially inward to the bore fluid side and radially outward to the outer coagulant side. Therefore, one can control membrane morphology, particle distribution, and separation performance via the manipulation of elongational draw ratio with the aid of shear stress induced by dope flow within the spinneret and die swell out of the spinneret. © 2006 Elsevier Ltd. All rights reserved.
Source Title: Chemical Engineering Science
ISSN: 00092509
DOI: 10.1016/j.ces.2006.05.040
Appears in Collections:Staff Publications

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