Topic
Silica gel
About: Silica gel is a research topic. Over the lifetime, 22313 publications have been published within this topic receiving 325516 citations. The topic is also known as: Amorphous silica & Precipitated amorphous silica.
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TL;DR: Transparent silica gel-polymer composites have been prepared by the impregnation of porous gels with organic monomer and polymerization in situ as mentioned in this paper, and properties such as density, refractive index, modulus of rupture, compressive strength, abrasion rate and Vickers hardness have been measured over the compositional range of 100% silica to 100% polymethyl methacrylate (PMMA).
Abstract: Transparent silica gel–polymer composites have been prepared by the impregnation of porous gels with organic monomer and polymerization in situ. The relative amount of each phase was adjusted by varying the porosity of the silica gel prior to impregnation. These materials constitute a new class of transparent composites. Properties, such as density, refractive index, modulus of rupture, compressive strength, abrasion rate, and Vickers hardness, have been measured over the compositional range of 100% silica to 100% polymethyl methacrylate (PMMA).
187 citations
TL;DR: A novel process is presented which allows one to synthesize porous silica beads and control their particle diameter in situ, within the range of 0.2-2.0 microm, and thereby no sizing is required and losses of silica are avoided.
186 citations
TL;DR: Monolithic silica gel microhoneycombs were prepared using pseudosteady state growth of ice crystals which occurs during the unidirectional freeze-gelation of freshly gelled aqueous silica hydrogels, followed by a pore-protecting drying method, freeze drying.
184 citations
TL;DR: In this paper, the effects of grafting the alumina species at the surface of silica support on the H3PW12O40 (HPW) immobilization capacity and performance of loaded HPW in acid-catalyzed reactions were studied with regular silica-gel and ordered mesostructured silica SBA-15.
184 citations
TL;DR: In this paper, the authors investigated the temperature evolution of the structure of silica thin films by Fourier Transform Infrared (FTIR) Spectroscopy and found that the removal of water from the pores and gel surface is easier when the gels are prepared in basic conditions.
Abstract: In this work we investigated the temperature evolution of the structure of silica thin films by Fourier Transform Infrared (FTIR) Spectroscopy. The gels, prepared by hydrolysis and polycondensation in the presence of an excess of water to tetramethoxysilane, were thin enough to be studied in transmission. It was found that the removal of water from the pores and gel surface is easier when the gels are prepared in basic conditions. During the drying heat treatment, residual methanol oxidizes and produces formaldehyde, formic acid and formates. These species are still present in the gel at 300 °C.
184 citations