Molecular design of nanohybrid gas separation membranes for optimal CO2 separation

Cher Hon Lau, Donald Paul, Tai-Shung Chung (Lead Author)

Research output: Contribution to journalArticlepeer-review


Organic-inorganic materials comprising CO2-philic components may yield superior CO2 transport properties and good CO2/H2 gas selectivity. We report that a fine balance in size heterogeneity in the silicon-based structures is essential and a mixture of sizes up to 50 nm surrounded by 5–15 nm silicon-based nanostructures is the preferred inorganic phase morphology that yields optimal nanohybrid membranes. The combination of optimal synthesis conditions i.e. water/silicon ratio, condensation and ozone pre-treatment durations yields a nanohybrid membrane with a CO2 permeability of 2000 Barrer while achieving a CO2/H2 selectivity of 11. The findings of this work are important for the design of gas separation membranes using green materials.
Original languageEnglish
Pages (from-to)454 - 465
Number of pages12
Issue number2
Early online date19 Dec 2011
Publication statusPublished - 24 Jan 2012


  • CO separation
  • Hybrid materials
  • Nanohybrid membranes


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