Control of pore sizes in mesoporous silica templated by liquid crystals in block copolymer-cosurfactant-water systems

Pingyun Feng, Xianhui Bu, David J. Pine

Research output: Contribution to journalArticle

Abstract

Colloidal silica has been polymerized in the aqueous domain of lyotropic liquid crystal phases in ternary surfactant (Pluronic F127 or P123)-cosurfactant (butanol, pentanol, or hexanol)-water systems to create optically transparent mesostructured surfactant-cosurfactant-silica monoliths. The use of ternary systems enriches phase diagrams of aqueous surfactant systems, which in turn introduces more flexibility and diversity into the designed synthesis of mesoporous materials. Lyotropic surfactant liquid crystal phases are preserved throughout the inorganic polymerization and gelation processes and directly template the formation of inorganic mesophases. The cosurfactant chain length and the cosurfactant/surfactant mass ratio have been used to control the pore size. The large shrinkage of mesopores during calcination can be reduced with hydrothermal treatment prior to calcination. Highly ordered mesoporous silica samples with identical pore sizes, but very different wall thickness, can be prepared. The removal of surfactants and cosurfactants gives periodic hexagonal mesoporous silica with excellent thermal and hydrothermal stability.

Original languageEnglish (US)
Pages (from-to)5304-5310
Number of pages7
JournalLangmuir
Volume16
Issue number12
DOIs
StatePublished - Jun 13 2000

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Liquid Crystals
block copolymers
Surface-Active Agents
Silicon Dioxide
Liquid crystals
Block copolymers
Pore size
Surface active agents
surfactants
liquid crystals
Silica
silicon dioxide
porosity
Water
water
UCON 50-HB-5100
Calcination
roasting
Systems (metallurgical)
Pentanols

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Control of pore sizes in mesoporous silica templated by liquid crystals in block copolymer-cosurfactant-water systems. / Feng, Pingyun; Bu, Xianhui; Pine, David J.

In: Langmuir, Vol. 16, No. 12, 13.06.2000, p. 5304-5310.

Research output: Contribution to journalArticle

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