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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01 Jun 1982
TL;DR: In this paper, a process for the preparation of monolithic silica aerogels by drying silica gels under hypercritical conditions is described, which is characterized by the absence of washing of the silica gel, a high heating rate in the autoclave and purging of the auto-cleaner after substantial removal of the solvent.
Abstract: The invention relates to a process for the preparation of monolithic silica aerogels by drying silica gels under hypercritical conditions, which is characterized by the absence of washing of the silica gel, a high heating rate in the autoclave and purging of the autoclave after substantial removal of the solvent. Other preferred conditions are the use of an amount of water not exceeding 1.5 times the stoichiometric amount for the hydrolysis, hypercritical conditions corresponding to a temperature of 265°-275° C. and to a pressure of 150-200 bars, and so on. Use of the aerogels for the preparation of silica glass bodies or articles and of heat-insulating materials.
74 citations
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TL;DR: In this article, composite desiccant based on silica gel and lithium chloride is adopted as solid adsorbent in DCHE, and the equilibrium isotherms of aluminum foils were obtained and analyzed through experiment.
74 citations
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TL;DR: In this article, two nonporous metallic mesh arrangements having high thermal conductivity compared to silica sand and silica gel were used as a packing material in a fixed bed setup for faster hydrate growth kinetics.
74 citations
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TL;DR: In this article, the catalytic growth of carbon nanotubes was investigated from the point of view of reaction mechanism, and it was proved that only catalytic particles deposited on the external surfaces of porous support could take part in the catalyst-assisted carbon-nanotube formation.
74 citations
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TL;DR: This method has been used to determine the glucose concentration in real human blood samples and had a fast response time of less than 10 s, a high sensitivity of 420 nA mM−1, a long-term stability of over 60 days, and a good selectivity.
Abstract: An improved amperometric glucose biosensor based on glucose oxidase immobilized in sol–gel chitosan/silica hybrid composite film, which was prepared from chitosan (CS) and methyltrimethoxysilane (MTOS), on the surface of Prussian blue (PB)-modified glass carbon electrode was developed. The film was characterized by FT-IR. Effects of some experimental variables such as ratio of CS to silica, buffer pH, temperature, and applied potential on the current response of the biosensor were investigated. The biosensor fabricated under optimal conditions had a linear response to glucose over the range 5.0×10−5 to 2.6×10−2 M with a correlation coefficient of 0.9948 and a detection limit of 8.0×10−6 M based on S/N =3. The biosensor had a fast response time of less than 10 s, a high sensitivity of 420 nA mM−1, a long-term stability of over 60 days, and a good selectivity. The apparent Michaelis–Menten constant Km was found to be 3.2×10−3 M. The activation energy for enzymatic reaction was calculated to be 21.9 kJ mol−1. This method has been used to determine the glucose concentration in real human blood samples.
74 citations