Reference : Synthesis of large pore disordered MSU-type mesoporous silicas through the assembly o...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/137338
Synthesis of large pore disordered MSU-type mesoporous silicas through the assembly of C16(EO)10 surfactant and TMOS silica source: Effect of the hydrothermal treatment and thermal stability of materials
English
Blin, J. L. [Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Chimie > Chimie des Matériaux Inorganiques > >]
Léonard, Alexandre mailto [Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Chimie > Laboratoire de Chimie des Matériaux Inorganiques > >]
Su, B. L. [Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Chimie > Chimie des Matériaux Inorganiques > >]
2001
Journal of Physical Chemistry B
105
26
6070-6079
Yes (verified by ORBi)
International
1089-5647
[en] Non-ionic surfactant ; Mesoporous silica ; Hydrothermal treatment
[en] Decaoxyethylene cetyl ether [C 16(EO) 10] has been employed as templating agent for large pore disordered MSU-type mesoporous silicas synthesis. The effect of the hydrothermal treatment (heating time and temperature) on the textural properties, in particular, pore diameter of materials has been investigated. The obtained materials have been characterized by different techniques such as X-ray diffraction, scanning and transmission electron microscopy and nitrogen adsorption-desorption analysis. The thermal stability of the compounds is also evaluated. Our results show that the pore diameter depends strongly on the heating time and temperature. This is the result of a competition between the stretching of the surfactant chains, which can lead to the breakdown of the walls separating adjacent pores, and the reorganization of micelles with heating time and temperature. At higher temperature or for longer durations, a more extended surfactant molecular conformation can be obtained, which leads to materials with larger pore sizes. A reorganization of the micellar solution during the hydrothermal treatment in autoclave can also simultaneously occur to give materials with smaller pore diameter. It is found that compounds prepared with the nonionic surfactant exhibit an enhanced thermal stability compared to those synthesized with cetyltrimethylammonium bromide (CTMABr) as templating agent. This higher stability is related to the synthesis pathway and the structure of materials.
http://hdl.handle.net/2268/137338
10.1021/jp0036442

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