A simple approach to estimate gas permeability and selectivity of extremely thin and brittle materials

Tai Shung Chung*, Eddy Swee Phin Loh, Jyh Jeng Shieh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We have determined that the permeability and selectivity of ultrathin poly (4-vinyl pyridine) (PVP) material using the basic concept of microporous composite hollow fibers, pre-wetting technology and the resistance model. The calculated O2 and N2 permeabilities of an ultrathin PVP layer (~ 400 Å) at room temperature are about 0.40 and 0.049 Barrers, respectively, and the O2/N2 selectivity is approximately 8.3. To measure the permeability and selectivity of ultrathin brittle materials, two types of composite membranes have to be prepared; one is the silicone rubber/substrate membrane and the other is the silicone rubber/brittle material/substrate membrane prepared by the pre-wetting method. The substrate is preferred to be highly permeable with minimum surface defects. The pre-wetting agent is to prevent pore intrusion by sealing surface pores of the substrate before depositing the brittle material on the top of the substrate. Mathematically, the pre-wetting simplifies the resistance model to calculate the permeance of the ultrathin brittle material.

Original languageEnglish (US)
Pages (from-to)1093-1099
Number of pages7
JournalChemical Engineering Science
Volume55
Issue number6
DOIs
StatePublished - Mar 2000
Externally publishedYes

Keywords

  • Brittle materials
  • Gas separation
  • Multilayer composite membrane
  • Permeability
  • Poly(4-vinylpyridine)

ASJC Scopus subject areas

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

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