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Letter

Elongated Silica Nanoparticles with a Mesh Phase Mesopore Structure by Fluorosurfactant Templating

Bing Tan,^† Alan Dozier,^† Hans-Joachim Lehmler,^‡ Barbara L. Knutson,^† and Stephen E. Rankin*^†

Chemical and Materials Engineering Department, University of Kentucky, 177 Anderson Hall, Lexington, Kentucky 40506-0046, and Department of Occupational and Environmental Health, University of Iowa, 100 Oakdale Campus #124 IREH, Iowa City, Iowa 52242-5000

Langmuir, 2004, 20 (17), pp 6981–6984

DOI: 10.1021/la049474s

Publication Date (Web): July 14, 2004

†

University of Kentucky.

‡

University of Iowa.

To whom correspondence should be addressed. E-mail: srankin@engr.uky.edu. Phone: (859)257-9799.

Abstract

Mesoporous silica materials with pore structures such as 2D hexagonal close packed, bicontinuous cubic, lamellar, sponge, wormholelike, and rectangular have been made by using surfactant templating sol−gel processes. However, there are still some “intermediate” phases, in particular mesh phases, that are formed by surfactants but which have not been made into analogous silica pore structures. Here, we describe the one-step synthesis of mesoporous silica with a mesh phase pore structure. The cationic fluorinated surfactant 1,1,2,2-tetrahydroperfluorodecylpyridinium chloride (HFDePC) is used as the template. Like many fluorinated surfactants, HFDePC forms intermediate phases in water (including a mesh phase) over a wider range of compositions than do hydrocarbon surfactants. The materials produced by this technique are novel elongated particles in which the layers of the mesh phase are oriented orthogonal to the main axis of the particles.

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