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Science 25 July 1997:
Vol. 277. no. 5325, pp. 552 - 556
DOI: 10.1126/science.277.5325.552
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Reports

Formation of a Silicate L3 Phase with Continuously Adjustable Pore Sizes

K. M. McGrath, D. M. Dabbs, N. Yao, I. A. Aksay, S. M. Gruner *

The lyotropic L3 phase was used as a template to form nanoporous monolithic silicates with continuously adjustable pore sizes. The monolith was optically isotropic and transparent with a nonperiodic network. The pore size was adjusted by a change in the solvent volume fraction rather than by a change of the surfactant. Unlike other silicates, the bicontinuous pores were water-filled; removal of surfactant was not necessary to access the pores. Measured characteristic dimensions were from six to more than 35 nanometers. For a given solvent fraction, x-ray scattering indicated little variation of pore widths, in marked contrast to the polydisperse pores of aerogels.

K. M. McGrath and S. M. Gruner, Department of Physics and Princeton Materials Institute, Princeton University, Bowen Hall, 70 Prospect Avenue, Post Office Box 708, Princeton, NJ 08544, USA.
D. M. Dabbs and I. A. Aksay, Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, NJ 08544, USA.
N. Yao, Princeton Materials Institute, Princeton University, Princeton, NJ 08544, USA.
*   To whom correspondence should be addressed: Physics Department, Cornell University, Clark Hall, Ithaca, NY 14853-2501.

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