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: In this paper, a new surface molecular imprinting technique is put forward, and a kind of novel ion-imprinted polymers (IIPs) were prepared through a new approach: first, functional macromolecule polyethyleneimine (PEI) was grafted onto the surfaces of silica gel particles via the coupling grafting method (grafting to) method, and the composite material PEI/SiO2 with chemical linking was formed; secondly the ionic imprinting was carried out towards the macromolescule PEI grafted on the surface of
88 citations
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TL;DR: In this article, a highly ordered mesoporous silica, SBA-15, was synthesized and various amounts of lanthanum oxide were incorporated into it, and several characterization techniques, such as X-ray diffraction (XRD), nitrogen gas isotherm, and Fourier transform infrared (FTIR) spectroscopy were used to investigate physicochemical properties of the media and to elucidate their arsenate adsorption behavior.
88 citations
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88 citations
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01 Sep 1995
TL;DR: In this paper, three mesoporous silica gels with variable pore size were modified with γ-aminopropyltriethoxysilane and the degree of surface hydration and hydroxylation and the available specific surface area were varied by a variation of pretreatment temperature.
Abstract: Three mesoporous silica gels with variable pore size were modified with γ-aminopropyltriethoxysilane. The degree of surface hydration and hydroxylation and the available specific surface area were varied by a variation of pretreatment temperature. The effect of surface and structural properties of the silica substrate on both chemical and physical interaction of the silane with the silica were characterized using spectrophotometric and elemental analysis data. Total deposition is governed by the degree of hydration and the specific surface area of the substrate. Hydration causes hydrolysis and polymerization of the grafted molecules. On the dehydrated but hydroxylated substrate, a coating layer with a coverage of 2.05 molecules/nm2 is formed. The degree of chemical bonding is controlled by the number of surface hydroxyls if a relative excess of silane over surface silanols is used. On dehydroxylated silica a diverging reaction behavior is observed. The relative amount of physisorption increases largely. If the average pore radius r ⩽ 20 A steric hindrance lowers the surface coverage value.
87 citations
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TL;DR: In this article, an experimental setup of a desiccant dehumidification unit silica gel coated fin-tube heat exchanger is installed and investigated, and the system performance is evaluated in terms of moisture removal mass and thermal COP.
87 citations