Report

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

See allHide authors and affiliations

Science  10 Oct 1997:
Vol. 278, Issue 5336, pp. 264-268
DOI: 10.1126/science.278.5336.264

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Abstract

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.

  • * Permanent address: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095–1569, USA.

View Full Text