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), 117-123. (doi: 10.1039/b106077p).
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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.
|Keywords:||molecular-sieve mcm-41, pore-size, phases, surfactants, aluminosilicate, templates, films, manganosilicates, transformation, adsorbent|
|Subjects:||Q Science > QD Chemistry|
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||17 Feb 2006|
|Last Modified:||27 Mar 2014 18:09|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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