Friday, 4 November 2005 - 2:36 PM
605g
Bi-Functionalized Mesoporous Silica Synthesized Using Fluorinated Surfactants as Template
Gifty Osei-Prempeh, University of Kentucky, Chemical and Materials Engineering Department, 177 Anderson Hall, Lexington, KY 40506, Barbara L. Knutson, University of Kentucky, Dept. of Chemical and Materials Engineering, 177 Anderson Hall, Lexington, KY 40506, Stephen E. Rankin, Chemical and Materials Engineering, University of Kentucky, 177 Anderson Hall, Lexington, KY 40506, and Hans-Joachim Lehmler, University of Iowa, 222 IREH , Department of Occupational and Environmental Health, Iowa City, IA 52242-5000.
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 (C
6F
13C
2H
4-) functionalized porous silica materials using fluorocarbon surfactants (C
6F
13C
2H
4NC
5H
5Cl and C
8F
17C
2H
4NC
5H
5Cl ) as templates is described and extended to bi-functionalized 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 (C6F13C2H4NC5H5Cl and C8F17C2H4NC5H5Cl )or cetylpyridinium bromide (C16F33NC5H5Br : 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.
See more of #605 - Nanostructured Organic/Inorganic Hybrid Materials: II (TF001)
See more of Topical F – 5th Topical Conference on Nanoscale Science and Engineering
See more of The 2005 Annual Meeting (Cincinnati, OH)