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Formation of highly ordered mesoporous silica materials adopting lyotropic liquid crystal mesophases

El-Safty, S.A. and Evans, J. (2002) Formation of highly ordered mesoporous silica materials adopting lyotropic liquid crystal mesophases Journal of Materials Chemistry, 12, (1), pp. 117-123. (doi:10.1039/b106077p).

Record type: Article


Mesoporous silica materials have been synthesised in strongly acidic media at pH = 1.3 using high concentrations of a non- ionic surfactant (Brij 76) as a structure- directing agent. Well- defined ordered mesoporous silicas with hexagonal (H-I), lamellar (L-infinity) and solid phase (S) structure have been prepared at room temperature according to the lyotropic liquid crystalline mesophases of Brij 76. At high temperature (60°C), highly ordered cubic (Ia3d), cubic (Im3m) and 3-d hexagonal (p6(3)/mmc) nanostructured materials have been produced. The synthesised materials were studied by powder X- ray diffraction (XRD), the Brunauer- Emmett-Teller (BET) method for nitrogen adsorption/ desorption isotherms and surface area measurements. Transmission electron microscopy (TEM), XRD and TEM patterns for all materials show well- defined long- range porous architectures. It was found that BET surface area values of the nanostructured materials are reduced upon increasing the temperature of synthesis.

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Published date: 2002
Keywords: molecular-sieve mcm-41, pore-size, phases, surfactants, aluminosilicate, templates, films, manganosilicates, transformation, adsorbent


Local EPrints ID: 19723
PURE UUID: 5c96d071-70ef-4194-bb47-25874d540a68

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Date deposited: 17 Feb 2006
Last modified: 17 Jul 2017 16:30

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Author: S.A. El-Safty
Author: J. Evans

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