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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111 citations
TL;DR: In this article, the effects of resin molecular weight on the flame-retardant mechanism of silica were studied with two different molecular weights of poly(methyl methacrylate) (PMMA), 122,000 and 996,000 g/mol, and two silicas, fused silica with a small surface area and silica gel with a large surface area.
Abstract: The effects of resin molecular weight on the flame-retardant mechanism of silica were studied with two different molecular weights of poly(methyl methacrylate) (PMMA), 122,000 and 996,000 g/mol, and two silicas, fused silica with a small surface area and silica gel with a large surface area. A total of six different samples were studied, with a mass fraction of 10% silica. The mass loss rate of the six samples in nitrogen and the heat release rate from burn- ing in air were measured at an external radiant flux of 40 kW/m 2 . The addition of silica gel to the low-molecular- weight PMMA significantly reduced the mass loss rate and heat release rate; addition to the high-molecular-weight PMMA provided the largest reductions of these quantities in this study. For fused silica, some reduction in mass loss rate and heat release rate was observed when it was added to the high-molecular-weight PMMA; addition to the low-molec- ular-weight PMMA did not reduce either loss rate. Chemical analysis of the collected residues and observation of the sample surface during gasification reveal the accumulation of silica near the surface; the larger its coverage over the sample surface was, less the mass loss rate and heat release rate were. Both the level of accumulation and its surface coverage depended strongly not only on the silica charac- teristics but also on the melt viscosity of the PMMA. © 2002
111 citations
TL;DR: In this paper, the effect of water, t-butanol and blue silica gel as water adsorbent on the yield of biodiesel by methanolysis of canola oil was studied using self-made biocatalysts.
111 citations
Patent•
14 Oct 1993
TL;DR: In this article, a vapor phase corrosion inhibitor-desiccant composite comprising silica gel granules coated with a component is selected from a formulation comprising anhydrous molybdates such as ammonium dimolybdate, sodium molyb date, mixed with benzotriazole and sodium nitrate.
Abstract: A vapor phase corrosion inhibitor-desiccant composite comprising silica gel granules coated with a vapor phase corrosion inhibitor component. The corrosion inhibitor component is selected from a formulation comprising anhydrous molybdates such as ammonium dimolybdate, sodium molybdate and amine molybdates mixed with benzotriazole and sodium nitrate, or from a formulation comprising amine benzoates, amine nitrates and benzotriazole. The composites can be impregnated into foam, extruded with polyolefin films which can additionally be laminated with metallized second film, or encapsulated in an air-permeable container. The corrosion inhibitor formulations have vapor pressures which provide ongoing corrosion protection for susceptible articles situated favorably with respect to the composite.
111 citations
TL;DR: In this article, the extraction of rare earth elements from bauxite residue by dry digestion method followed by water leaching was investigated, and it was shown that at ambient temperatures, silica dissolution increases with increasing acid concentration, which leads to the formation of silica gel.
111 citations