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: An improved high-performance liquid chromatographic method for the separation and quantitation of nine phospholipid classes is described, based on normal-phase chromatography with silica gel as stationary phase and a binary gradient with mixtures of chloroform, methanol and water as mobile phase.
71 citations
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TL;DR: In this paper, the use of N,N-dimethylformamide (DMF) was found to be effective in the solgel synthesis of silica gel and glass monoliths from tetramethoxysi lane (TMOS) by the sol-gel method.
Abstract: The use of N,N-dimethylformamide (DMF) was found to be effective in the sol-gel synthesis of silica gel and glass monoliths from tetramethoxysi lane (TMOS) by the sol-gel method. Wet gel bodies prepared by gelation of TMOS-DMF-CH3OH-H2O-NH4OH (or HNO3) solutions could be dried without the occurrence of fracture or cracks when drying conditions were appropriate. Furthermore, the resultant dried gel monoliths could be converted without cracking or bloating to silica glass on heating up to 1050° C and holding there for 2 h, when the composition of the starting solution was appropriate.
71 citations
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TL;DR: Re reproducible enantioseparations were obtained when the chiral selector was removed from the monolithic column by flushing it with appropriate solvent and the column recoated.
Abstract: Monolithic capillary columns containing native silica gel were modified with cellulose tris(3,5-dimethylphenylcarbamate) (CDMPC) and used for enantioseparations in capillary liquid chromatography. The method adopted for in situ enantioselective modification of monolithic fused silica capillary columns by coating with CDPMC appears to be fairly simple and fast. High efficiency enantioseparations of test racemic compounds and several chiral drugs were achieved in a short time. It was possible to increase the amount of chiral selector present by multiple coating of monoliths with CDMPC. The baseline enantioseparation of 2,2,2-trifluoro-1-(9-anthryl)ethanol was achieved in an analysis time less than 30 s with this capillary column. In addition, reproducible enantioseparations were obtained when the chiral selector was removed from the monolithic column by flushing it with appropriate solvent and the column recoated.
71 citations
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TL;DR: Waste silica was modified by coating its surface with iron oxide aiming to obtain an effective adsorbent for metal removal from wastewater to investigate the efficacy of the adsorbents and the effect of contact time, pH and salt concentration on metal adsorption.
71 citations
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TL;DR: Copolymers of N-isopropylacrylamide, environmentally-responsive polymers, which respond to temperature and other external stimuli are designed and synthesized and confirmed that the interactions between the solute and stationary phase could be freely controlled by the temperature and the pH.
71 citations