Article abstract
Nature Materials 3, 816 - 822 (2004)
Published online: 17 October 2004 | doi:10.1038/nmat1230
Subject Categories: Ceramics | Porous materials | Design synthesis and processing | Computation, modelling and theory
Composite mesostructures by nano-confinement
Yiying Wu1, Guosheng Cheng1, Kirill Katsov2, Scott W. Sides3, Jianfang Wang1, Jing Tang2, Glenn H. Fredrickson2,3, Martin Moskovits1 & Galen D. Stucky1,2
Abstract
In a physically confined environment, interfacial interactions, symmetry breaking, structural frustration and confinement-induced entropy loss can play dominant roles in determining molecular organization. Here we present a systematic study of the confined assembly of silica–surfactant composite mesostructures within cylindrical nanochannels of varying diameters. Using exactly the same precursors and reaction conditions that form the two-dimensional hexagonal SBA-15 mesostructured thin film, unprecedented silica mesostructures with chiral mesopores such as single- and double-helical geometries spontaneously form inside individual alumina nanochannels. On tightening the degree of confinement, a transition is observed in the mesopore morphology from a coiled cylindrical to a spherical cage-like geometry. Self-consistent field calculations carried out to account for the observed mesostructures accord well with experiment. The mesostructures produced by confined syntheses are useful as templates for fabricating highly ordered mesostructured nanowires and nanowire arrays.
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA
- Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA
Correspondence to: Galen D. Stucky1,2 e-mail: stucky@chem.ucsb.edu
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