Fluorinated surfactant templating of vinyl-functionalized nanoporous silica

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

doi:10.1016/j.micromeso.2005.06.014

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Fluorinated surfactant templating of vinyl-functionalized nanoporous silica

Journal article

Peer reviewed

Fluorinated surfactant templating of vinyl-functionalized nanoporous silica

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

Microporous and mesoporous materials, Vol.85(1), pp.16-24

2005

DOI: 10.1016/j.micromeso.2005.06.014

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Abstract

Ordered nanoporous vinyl-functionalized silica materials are synthesized by the ‘one-pot’ (direct) synthesis method using three cationic fluorinated surfactants (C 6F 13C 2H 4NC 5H 5Cl, C 8F 17C 2H 4NC 5H 5Cl and C 10F 21C 2H 4NC 5H 5Cl) as templates in basic medium under ambient conditions. The materials obtained possess lower degrees of 2D hexagonal closed packed ordering of the pores when compared to CTAB templated materials. Increases in vinyl content lead to reductions in pore size as well as material order. In spite of having smaller pores, bromination experiments suggest that the vinyl groups are more accessible in the fluoro-surfactant templated materials. Although confinement of the vinyl groups to the palisade region of the fluorinated micelle templates may contribute to this increase in accessibility, reduced pore order in the fluorinated templated materials may also improve the accessibility, as observed here for intentionally disordered CTAB-templated materials. Cationic fluorocarbon surfactants not only have the potential to be templating agents, but also present the possibility of re-organizing the alignment of organic functional groups in the pores of organic–inorganic hybrids obtained by direct synthesis.

Fluorinated surfactants

Mesoporous silica

Vinyl

Details

Title: Subtitle: Fluorinated surfactant templating of vinyl-functionalized nanoporous silica
Creators: Gifty Osei-Prempeh - Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506-0046, USA
Hans-Joachim Lehmler - Department of Occupational and Environmental Health, University of Iowa, College of Public Health, Iowa City, IA 52242-5000, USA
Barbara L Knutson - Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506-0046, USA
Stephen E Rankin - Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506-0046, USA
Resource Type: Journal article
Publication Details: Microporous and mesoporous materials, Vol.85(1), pp.16-24
DOI: 10.1016/j.micromeso.2005.06.014
ISSN: 1387-1811
eISSN: 1873-3093
Publisher: Elsevier Inc
Language: English
Date published: 2005
Academic Unit: Occupational and Environmental Health; Iowa Neuroscience Institute
Record Identifier: 9984001085102771

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