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Cooperative Formation of Inorganic-Organic Interfaces in the Synthesis of Silicate Mesostructures

Alain MonnierDepartment of Chemistry, University of California, Santa Barbara, CA 93106, and Departement de Chimie Physique Sciences II, 1211 Geneva, SwitzerlandFerdi SchüthDepartment of Chemistry, University of California, Santa Barbara, CA 93106, and Institüt für Anorganische Chemie, Johannes-Gutenberg Universität, 6500 Mainz, GermanyQuan HuoDepartment of Chemistry, University of California, Santa Barbara, CA 93106D. KumarDepartment of Chemistry, University of California, Santa Barbara, CA 93106David I. MargoleseDepartment of Chemistry, University of California, Santa Barbara, CA 93106Robert S. MaxwellDepartment of Chemistry, University of California, Santa Barbara, CA 93106Galen D. StuckyDepartment of Chemistry, University of California, Santa Barbara, CA 93106M. KrishnamurtyMaterials Department, University of California, Santa Barbara, CA 93106P. M. PetroffMaterials Department, University of California, Santa Barbara, CA 93106Ali FirouziDepartment of Chemical and Nuclear Engineering, University of California, Santa Barbara, CA 93106Michael T. JanickeDepartment of Chemical and Nuclear Engineering, University of California, Santa Barbara, CA 93106Bradley F. ChmelkaDepartment of Chemical and Nuclear Engineering, University of California, Santa Barbara, CA 93106

1993en

ABI

Annotatsiya

A model is presented to explain the formation and morphologies of surfactant-silicate mesostructures. Three processes are identified: multidentate binding of silicate oligomers to the cationic surfactant, preferential silicate polymerization in the interface region, and charge density matching between the surfactant and the silicate. The model explains present experimental data, including the transformation between lamellar and hexagonal mesophases, and provides a guide for predicting conditions that favor the formation of lamellar, hexagonal, or cubic mesostructures. Model Q(230) proposed by Mariani and his co-workers satisfactorily fits the x-ray data collected on the cubic mesostructure material. This model suggests that the silicate polymer forms a unique infinite silicate sheet sitting on the gyroid minimal surface and separating the surfactant molecules into two disconnected volumes.

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Identifikatorlar

DOI: 10.1126/science.261.5126.1299

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