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Science 10 October 1997:
Vol. 278. no. 5336, pp. 264 - 268
DOI: 10.1126/science.278.5336.264
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Reports

Magnetic Field Alignment of Ordered Silicate-Surfactant Composites and Mesoporous Silica

Sarah H. Tolbert, * Ali Firouzi, Galen D. Stucky, dagger Bradley F. Chmelka dagger

Macroscopic orientational ordering of the pores of condensed hexagonal mesostructured silica (MCM-41) was achieved through alignment of an unpolymerized, hexagonal, lyotropic silicate-surfactant liquid crystal in a high magnetic field. This alignment was preserved after polymerization of the silicate species by acid treatment. Subsequent calcination to remove the surfactant yielded a mesoporous silica solid that retained both macroscopic pore alignment and mesoscale periodicity. Potential applications of such liquid crystal processing strategies range from the formation of anisotropic silica-based bulk ceramics to the production of oriented mesoporous thin films for chemical sensors, separations, catalysis, or host-guest applications.

S. H. Tolbert, Department of Chemistry, University of California, Santa Barbara, CA 93106, USA.
A. Firouzi and B. F. Chmelka, Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA.
G. D. Stucky, Department of Chemistry and Materials Department, University of California, Santa Barbara, CA 93106, USA.
*   Permanent address: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA.

dagger    To whom correspondence should be addressed.

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