Evolution of nano-particle distribution during the fabrication of mixed matrix TiO2-polyimide hollow fiber membranes

Youchang Xiao, Kai Yu Wang, Tai-Shung Chung*, Juina Tan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)6228-6233
Number of pages6
JournalChemical Engineering Science
Issue number18
StatePublished - Sep 1 2006


  • Elongation
  • Hollow fiber membrane
  • Particle distribution
  • Polyimide
  • TiO

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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