Effect of solution pH on the surface morphology of sol-gel derived silica gel

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Effect of solution pH on the surface morphology of sol-gel derived silica gel	688 KB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1134/S0020168517030050

Title: Effect of solution pH on the surface morphology of sol-gel derived silica gel
Creator: Faustova, Zhanna V.
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Slizhov, Yuri G.
Date: 2017
DOI: 10.1134/S0020168517030050
Description: We have examined the effect of solution acidity on the textural characteristics of silica gels prepared by sol–gel synthesis using tetraethyl orthosilicate (TEOS) as a silica precursor and cetyltrimethylammonium bromide (CTAB) as a template. Using IR spectroscopy, we have studied micellar TEOS solutions and the synthesized silica gel samples. The results demonstrate that, in an alkaline medium in a water–ethanol solution, SiO2 experiences short-range ordering on the surface of micelles formed by CTAB molecules, whereas in an acid medium the process is not influenced by the presence of CTAB. Nitrogen porosimetry and electron microscopy data indicate that the silica gel obtained at pH 2 is microporous, with an average pore size of 2 nm. In an alkaline medium at pH 10, we obtained mesoporous SiO2 (18 nm) with a narrow pore size distribution and a specific surface area of 110 m2/g.

Created: 29-11-2018

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Химический факультет Effect of solution pH on the surface morphology of sol-gel derived silica gel