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Science 24 February 1995:
Vol. 267. no. 5201, pp. 1138 - 1143
DOI: 10.1126/science.7855591
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Articles

Science, Vol 267, Issue 5201, 1138-1143
Copyright © 1995 by American Association for the Advancement of Science

articles

Cooperative organization of inorganic-surfactant and biomimetic assemblies

A Firouzi, D Kumar, LM Bull, T Besier, P Sieger, Q Huo, SA Walker, JA Zasadzinski, C Glinka, J Nicol, and al. et

Department of Chemical Engineering, University of California, Santa Barbara 93106.

A model that makes use of the cooperative organization of inorganic and organic molecular species into three dimensionally structured arrays is generalized for the synthesis of nanocomposite materials. In this model, the properties and structure of a system are determined by dynamic interplay among ion-pair inorganic and organic species, so that different phases can be readily obtained through small variations of controllable synthesis parameters, including mixture composition and temperature. Nucleation, growth, and phase transitions may be directed by the charge density, coordination, and steric requirements of the inorganic and organic species at the interface and not necessarily by a preformed structure. A specific example is presented in which organic molecules in the presence of multiply charged silicate oligomers self-assemble into silicatropic liquid crystals. The organization of these silicate-surfactant mesophases is investigated with and without interfacial silicate condensation to separate the effects of self-assembly from the kinetics of silicate polymerization.


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