Bi-functionalized mesoporous silica synthesized using fluorinated surfactants as template

Gifty Osei-Prempeh, Barbara L. Knutson, Stephen E. Rankin, Hans Joachim Lehmler

Research output: Contribution to conferencePaperpeer-review

Abstract

The recent demonstration of cationic fluorocarbon surfactants for the templating of mesoporous silica is extended to organic-inorganic hybrids through direct synthesis. The potential to align functional group in the pores of the templated silica material through the interactions of the fluoro-surfactant tail and a fluoro-surfactant functional group is examined. Investigation of the direct synthesis of tridecafluoro( 1H, 1H, 2H, 2H)octyl (C6F 13C2H4-) functionalized porous silica materials using fluorocarbon surfactants (C6F13C2H 4NC5H5Cl and C8F17C 2H4NC5H5Cl) as templates is described and extended to bifunctionalized materials. Incorporation of a second functional group (a reactive organic group) in addition to a fluorocarbon functional group could result in advanced materials for chromatography, sensing, and separations employing a low surface tension medium (e.g. fluorocarbon solvent or supercritical carbon dioxide) or a fluorine tagged reagent. This work investigates the bi-organic (tridecafluoro(1H, 1H, 2H, 2H)octyl and aminopropyl) functionalization of mesoporous silica by direct synthesis using fluoro-surfactants (C6F13C2H4NC 5H5Cl and C8F17C2H 4NC5H5Cl)or cetylpyridinium bromide (C 16F33NC5H5Br : hydrocarbon analogue of the fluoro-surfactants) as templates. Incorporation of the organic groups is confirmed for both the hydrocarbon and fluorocarbon templated materials by FTIR and TGA analysis. The material order and structure are analyzed using X-ray diffraction and TEM, and the physical properties are obtained using nitrogen adsorption analysis. The accessibility of the reactive aminopropyl group was examined as a function of the surfactant template.

Original languageEnglish
Pages13960
Number of pages1
StatePublished - 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005

Conference

Conference05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Country/TerritoryUnited States
CityCincinnati, OH
Period10/30/0511/4/05

ASJC Scopus subject areas

  • General Engineering

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