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Phenyl-functionalized silicate mesophases with hexagonal or cubic symmetries: influence of synthesis parameters.

Elsevier Science & Technology
DOI: 10.1016/s0167-2991(00)80225-6


Abstract Organically modified porous silicates have been prepared under acidic conditions, by direct reaction of a mixture of phenyltriethoxysilane (PTES) and tetraethoxysilane (TEOS), and an aqueous solution of cetyltrimethylammonium bromide (C.TAB). For a 1:4 molar ratio between PTES and TEOS, the hexagonal (2d, p6m) phase, but also a cubic phase analogous to the already reported SBA-1 phase (Pm3n), can be prepared. The surfactant can then be efficiently removed by calcination at 350°C, leading to phenyl-functionalized microporous silicates with two types of architecture. The influence of several parameters (PTES/TEOS ratio; ethanol content) that affect the organization of the samples, will be discussed.

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