Tri-bore ultra-filtration hollow fiber membranes with a novel triangle-shape outer geometry

Peng Wang, Lin Luo, Tai Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


The hollow fiber membrane with a multi-bore configuration has attracted much attention in recent years due to ease of potting during module fabrication and improved mechanical stability. The conventional multi-bore hollow fiber consists of seven or three bore channels and a round-shape outer geometry. In this work, novel tri-bore hollow fiber membranes made of Matrimid® and polyethersulfone (PES) materials with regular triangle-shape outer geometry have been fabricated. The fabricated membranes are advantageous in terms of uniform mechanical strength and enhanced permeation properties due to the evenly distributed membrane wall thickness. Experimental results suggest that the combined effects of rapid phase inversion, die swell, outer surface shrinkage and stress balance during the membrane formation are responsible for the unique membrane geometry. The micro-morphology, mechanical strength, pore size distribution and ultra-filtration rejection of the fabricated membranes were examined. We believe this work may provide useful insights for the fabrication of triangle-shape tri-bore membranes with other materials for various applications.

Original languageEnglish (US)
Pages (from-to)212-218
Number of pages7
JournalJournal of Membrane Science
StatePublished - Feb 15 2014


  • Blossom-shape spinneret
  • Membrane formation
  • Tri-bore hollow fiber
  • Triangle outer-geometry
  • Ultra-filtration

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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