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: ZrOCl 2 ·8H 2 O/silica gel as a highly water-tolerant catalyst system has been applied for the preparation of bis(indolyl)methanes via electrophilic substitution reactions of indoles with carbonyl compounds under solvent-free conditions.
Abstract: ZrOCl 2 ·8H 2 O/silica gel as a highly water–tolerant catalyst system has been applied for the preparation of bis(indolyl)methanes via electrophilic substitution reactions of indoles with carbonyl compounds under solvent-free conditions. The yields of the isolated products are from good to excellent.
108 citations
TL;DR: Selective water sorbents (SWSs) as discussed by the authors are composites of a type of "salt confined to a porous host matrix" and demonstrate an intermediate behavior between solid adsorbents, salt hydrates, and liq- uid absorbents.
Abstract: This paper summarizes literature data concerning a new family of materials for adsorptive cooling. They are composites of a type of "salt confined to a porous host matrix" (so called selective water sorbents or SWSs). These materials demonstrate an intermediate behavior between solid adsorbents, salt hydrates, and liq- uid absorbents. The thermodynamic equilibrium with water vapor has been measured for more than thirty SWSs based on halides, sulphates, and nitrates of alkaline and alkaline earth metals that are confined to various matrices (silica, alumina, porous carbons, clays, MCM-41, etc.). The important advantage of the SWSs is the possibility to controllably modify their water sorption properties in a wide range by varying (a) the chemical nature of the impregnated salt, (b) the porous structure of the host matrix, (c) the amount of the confined salt, and (d) the preparation conditions. This, in principle, allows purposeful synthesis of new solid sorbents with predetermined properties that fit the demands of particular adsorptive cycles. Appropriate examples are pre- sented in the paper. A recent study of adsorption chillers with granulated and compact layers of SWS-1L (CaCl 2 in mesoporous silica) showed an experimental COP as high as 0.6, which is larger than that reported for silica gel/water and zeolite/water systems under the same cycle conditions. The concept of matrix modification with an active salt can also be used for synthesis of efficient sorbents of carbon dioxide, methanol, and ammonia. Other practical applications of SWSs are briefly discussed, such as heat protection, gas drying, and fresh water production from the atmosphere.
108 citations
TL;DR: Spray drying is a promising way to produce spherical silica gel particles with a narrow particle size range for controlled delivery of toremifene citrate and dexmedetomidine HCl.
107 citations
TL;DR: In this article, a mesoporous silica KSK with a saturated aqueous solution of Ca(NO 3 ) 2 was synthesized and its equilibrium with water vapor was studied by measuring sorption isobars and isosters at T ǫ = 30-150°C.
107 citations
TL;DR: A survey of the nanocasting methods used for the synthesis of nanosized and nanostructured inorganic compounds can be found in this article, with a special attention paid to the use of porous materials such as mesostructicated silica, silica gel, and carbonaceous materials as hard templates for the preparation of metallic oxides.
107 citations