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

Formation of highly ordered mesoporous silica materials adopting lyotropic liquid crystal mesophases
Formation of highly ordered mesoporous silica materials adopting lyotropic liquid crystal mesophases
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.
molecular-sieve mcm-41, pore-size, phases, surfactants, aluminosilicate, templates, films, manganosilicates, transformation, adsorbent
117-123
El-Safty, S.A.
135100ff-4103-4888-9523-b7a90a1e2b8c
Evans, J.
05890433-0155-49fe-a65d-38c90ea25c69
El-Safty, S.A.
135100ff-4103-4888-9523-b7a90a1e2b8c
Evans, J.
05890433-0155-49fe-a65d-38c90ea25c69

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), 117-123. (doi:10.1039/b106077p).

Record type: Article

Abstract

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

Identifiers

Local EPrints ID: 19723
URI: http://eprints.soton.ac.uk/id/eprint/19723
PURE UUID: 5c96d071-70ef-4194-bb47-25874d540a68

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Date deposited: 17 Feb 2006
Last modified: 26 Apr 2022 20:41

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Contributors

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

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