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 article, the maximum capacity of interaction (Ns), enthalpies of interaction at different coverages of the surface, and integral enthalpy of interaction for a monolayer have been established.
Abstract: The reaction of silica gel with 3-(trimethoxysilyl)propane-1-thiol, MPTS, produced a thiol-modified silica gel, Sil–SH. This material removes silver, mercury, copper, zinc and nickel ions from aqueous solutions. Enthalpy changes that occur in the interactions between Sil–SH and these cations were obtained by a calorimetric titration technique, in which thermal effects and the quantities of cations that interact at each titration point were determined simultaneously. From this procedure, values of the maximum capacity of interaction (Ns), enthalpies of interaction at different coverages of the surface [Δint(i)Hm ] and integral enthalpy of interaction for a monolayer (ΔmonHm) have been established. It is shown that this method permits charting the basic sites created upon modification. From Δint(i)Hm values, the sequence of the interaction strength between the basic sites of the silica-attached MPTS and the cations is Hg2+>Ag+>Cu2+>Ni2+>Zn2+ , in agreement with the concept of hard and soft acids and bases. The influence of some parameters concerning the thermodynamics of solvation of the indicated transition metals has been also taken into account in the investigation of these interaction processes.
124 citations
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123 citations
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TL;DR: This article describes for the first time a sensitive and reproducible method for quantitative analysis of 4-hydroxynonenal in biological samples as well as in lipid-containing foodstuffs.
123 citations
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TL;DR: An impregnation technique for immobilization of silver(I) gelatin complex on silica gel deposited silver nanoparticles on the solid matrix and inspired the catalytic reduction of nitro-compounds in aqueous, organic, and three different micellar media.
123 citations
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TL;DR: The applicability of empirical based, thermodynamically based and test methods based on a retention model to characterise silica-based reversed phase stationary phases, as well as the influence of the eluent composition on the LC analysis of basic substances is described.
123 citations