Fluorinated surfactant templating of vinyl-functionalized nanoporous silica

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

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Ordered nanoporous vinyl-functionalized silica materials are synthesized by the 'one-pot' (direct) synthesis method using three cationic fluorinated surfactants (C6F13C2H4NC 5H5Cl, C8F17C2H 4NC5H5Cl and C10F21C 2H4NC5H5Cl) 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.

Original languageEnglish
Pages (from-to)16-24
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume85
Issue number1-2
DOIs
StatePublished - Oct 23 2005

Bibliographical note

Funding Information:
This material is based on work sponsored by the National Science Foundation under grant number DMR-0210517 and Kentucky Science and Engineering Foundation grant number KSEF-159-RDE-001. We thank Dr. Rodney Andrews and Rolando Gonzalez of the Center for Applied Energy Research for performing the nitrogen adsorption analysis of the microporous samples.

Keywords

  • Fluorinated surfactants
  • Mesoporous silica
  • Vinyl

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials

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