Organic-templating approach to synthesis of nanoporous silica composite membranes (I): TPA-templating and CO2 separation

S. M. Yang, Y. E. Lee, S. H. Hyun, C. H. Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Nanoporous silica composite membranes for gas separation have been synthesized by dip-coating the tetrapropylammonium (TPA)-templating silica sols on tubular alumina supports (pore size 2.8-100 nm), followed by eliminating the template via heat-treating at 550-600°C. The NMR spectroscopy of TPABr-silica hybrid composites obtained from the templated silica sols confirmed that TPA molecules (i.e., final pores) were uniformly distributed in the silica matrix. The average pore size and the specific surface area of an unsupported membrane prepared by firing the TPABr (6 wt%)-silica hybrid composite at 600°C were below 18 Å and 830 m2/g, respectively. Any defects such as cracks or pin-holes on the surface of amorphous silica composite membranes were not observed. The CO2/N2 separation factor of their composite membranes varied from 3.2 to 10.3 and their gas permeability from 10-8 to 10-9 mol/m2 · s · Pa depending on the microstructure of aluminar supports.

Original languageEnglish
Pages (from-to)2519-2525
Number of pages7
JournalJournal of Materials Science
Volume37
Issue number12
DOIs
Publication statusPublished - 2002 Jun 15

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Composite membranes
Silicon Dioxide
Silica
Polymethyl Methacrylate
Sols
Pore size
Gas permeability
Aluminum Oxide
Composite materials
tetrapropylammonium
Specific surface area
Nuclear magnetic resonance spectroscopy
Alumina
Gases
Cracks
Membranes
Coatings
Defects
Microstructure
Molecules

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Organic-templating approach to synthesis of nanoporous silica composite membranes (I): TPA-templating and CO2 separation",
abstract = "Nanoporous silica composite membranes for gas separation have been synthesized by dip-coating the tetrapropylammonium (TPA)-templating silica sols on tubular alumina supports (pore size 2.8-100 nm), followed by eliminating the template via heat-treating at 550-600°C. The NMR spectroscopy of TPABr-silica hybrid composites obtained from the templated silica sols confirmed that TPA molecules (i.e., final pores) were uniformly distributed in the silica matrix. The average pore size and the specific surface area of an unsupported membrane prepared by firing the TPABr (6 wt{\%})-silica hybrid composite at 600°C were below 18 {\AA} and 830 m2/g, respectively. Any defects such as cracks or pin-holes on the surface of amorphous silica composite membranes were not observed. The CO2/N2 separation factor of their composite membranes varied from 3.2 to 10.3 and their gas permeability from 10-8 to 10-9 mol/m2 · s · Pa depending on the microstructure of aluminar supports.",
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Organic-templating approach to synthesis of nanoporous silica composite membranes (I) : TPA-templating and CO2 separation. / Yang, S. M.; Lee, Y. E.; Hyun, S. H.; Lee, C. H.

In: Journal of Materials Science, Vol. 37, No. 12, 15.06.2002, p. 2519-2525.

Research output: Contribution to journalArticle

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