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Science 18 December 1998:
Vol. 282. no. 5397, pp. 2244 - 2246
DOI: 10.1126/science.282.5397.2244
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Reports

Hierarchically Ordered Oxides

Peidong Yang, Tao Deng, Dongyuan Zhao, Pingyun Feng, David Pine, Bradley F. Chmelka, George M. Whitesides, Galen D. Stucky *

Porous silica, niobia, and titania with three-dimensional structures patterned over multiple length scales were prepared by combining micromolding, polystyrene sphere templating, and cooperative assembly of inorganic sol-gel species with amphiphilic triblock copolymers. The resulting materials show hierarchical ordering over several discrete and tunable length scales ranging from 10 nanometers to several micrometers. The respective ordered structures can be independently modified by choosing different mold patterns, latex spheres, and block copolymers. The examples presented demonstrate the compositional and structural diversities that are possible with this simple approach.

P. Yang, D. Zhao, G. D. Stucky, Department of Chemistry, University of California, Santa Barbara, CA 93106, USA. T. Deng and G. M. Whitesides, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA. P. Feng, D. Pine, B. F. Chmelka, Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA.
*   To whom correspondence should be addressed.

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