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: A new chiral stationary phase made by immobilising cellulose tris(3,5-dichlorophenylcarbamate) on silica gel is able to operate under various chromatographic conditions and bring about new characteristics in enantiomeric recognition.
113 citations
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TL;DR: In this paper, the reaction of colloidal silica fumes with calcium hydroxide or hydrating tricalcium silicate (C3S) has been studied using calorimetry, chemical analyses, and scanning electron microscopy.
Abstract: Reactions of colloidal silica fumes with calcium hydroxide or hydrating tricalcium silicate (C3S) have been studied using calorimetry, chemical analyses, and scanning electron microscopy. Silica fume reacts immediately with calcium hydroxide forming a colloidal calcium silicate hydrate (C-S-H) similar to that formed by the hydration of C3S. When excess silica is present it reacts with C-S-H already formed to produce a new, highly polymerized C-S-H, having a very low C/S ratio (1.0). Silica fume accelerates the hydration of C3S, reduces the amount of calcium hydroxide formed by reacting with it, and slightly lowers the C-S-H ratio of the C-S-H formed by hydration. When large amounts of silica fume are present the formation of calcium hydroxide may be entirely suppressed and a highly polymerized C-S-H is formed. Silica fume is considered a good model for reactive pozzolans used in concrete.
113 citations
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TL;DR: In this article, it is suggested that the silica gel formed on the glass surface not only acts as a chelating agent, but also is flexible enough to supply the correct atomic distances required by the crystal structure of bone apatite.
Abstract: Some silicate glasses exhibit the property of bonding to bone. In vivo tests show that a layer of silica gel is always formed on the glass surface when the bonding is successful. From a comparison with the silicon chemistry of diatoms and connective tissues it is apparent that silicate chelates form an essential step in the formation and mineralization of hard tissues. The same kind of chelating is also demonstrated for silicate anions in binary melts. It is suggested that in implants, the silica gel formed on the glass surface not only acts as a chelating agent, but also is flexible enough to supply the correct atomic distances required by the crystal structure of bone apatite. The phosphate phase used in most bioactive glasses is suggested to act as a source for a phosphate buffer, which adjusts the surface acidity of the glass implant.
113 citations
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TL;DR: In this article, the adsorption characteristics of metal organic frameworks (MOFs) are compared to silica gel RD-2060, HKUST-1 and MIL-100 using an advanced gravimetric dynamic vapour sorption analyser (DVS).
113 citations
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TL;DR: A sensitive spray reagent has been developed for the analytical detection of acetates on the chromatographic plates and is based on the formation of the ferric hydroxamate of acetic acid.
Abstract: Thin layer chromatography on silica gel G with benzene–methanol mixtures is a rapid method for the analytical or semimicro preparative separation of low molecular weight carbohydrate acetates. Some...
113 citations