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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, the applicability and limitations of the electron microscope, x-ray diffraction, and adsorption techniques for the determination of particle size of supported metals have been explored using platinum on silica gel as an illustration.

84 citations

Journal ArticleDOI
TL;DR: The effect of alkyl substitution of the silica xerogel matrix on the release rate of dexmedetomidine was evaluated and a burst in drug release was shown fromAlkyl-substituted silica gel microparticles.

84 citations

Journal ArticleDOI
TL;DR: Bifunctional hybrid mesoporous silica potentially useful for drug targeting and a series of hybrid materials useful to investigate the complex structure of folate-derivatized materials have been developed starting from a silica gel substrate derivatized with amino-propyl functionality and successively coupled to folic or heptanoic acid.

84 citations

Journal ArticleDOI
Xiangbing Zhu1, Yuemei Cui1, Xijun Chang1, Xiaojun Zou1, Zhenhua Li1 
TL;DR: In this article, a new Pb-II-imprinted amino-functionalized silica gel sorbent was synthesized by an easy one-step reaction by combining a surface imprinting technique for selective solid-phase extraction of trace Pb(II) prior to its determination by inductively coupled plasma optical emission spectrometry.
Abstract: A new Pb(II)-imprinted amino-functionalized silica gel sorbent was synthesized by an easy one-step reaction by combining a surface imprinting technique for selective solid-phase extraction of trace Pb(II) prior to its determination by inductively coupled plasma optical emission spectrometry. The Pb(II)-imprinted amino-functionalized silica gel sorbent was characterized by Fourier transform infrared spectroscopy. Compared to non-imprinted polymer particles, the ion-imprinted polymers had higher selectivity and adsorption capacity for Pb(II). The maximum static adsorption capacity of the ion-imprinted and non-imprinted sorbent for Pb(II) was 19.66 and 6.20 mg g−1, respectively. The largest selectivity coefficient of the Pb(II)-imprinted sorbent for Pb(II) in the presence of Cd(II) was over 450. The relative selectivity (α r) values of Pb(II)/Cd(II) were 49.3 and 46.3, which were greater than 1. The distribution ratio (D) values of Pb(II)-imprinted polymers for Pb(II) were much larger than that for Cd(II). The detection limit (3σ) was 0.20 μg L−1. The relative standard deviation was 2.0% for 11 replicate determinations. The method was validated for the analysis three certified reference materials (GBW 08301, GBW 08504, GBW 08511), and the results are in good agreement with standard values. The method was also successfully applied to the determination of trace lead in plants and water samples with satisfactory results.

84 citations

Journal ArticleDOI
TL;DR: In this article, a continuous column reactor packed with silica gel supported by a CuBr-HMTETA catalyst has been successfully developed for ATRP of MMA, demonstrating the living character.
Abstract: A continuous column reactor packed with silica gel supported CuBr-HMTETA catalyst has been successfully developed for ATRP of MMA. The reactor had a good catalytic stability up to 100 h. The MMA conversion decreased with an increasing feeding flow rate. The polymerization kinetics was first order with respect to the monomer. The molecular weight increased linearly with conversion, demonstrating the living character. Possible flow back-mixing and polymer trapping in the pores of silica gel caused some broadening in the molecular weight distribution. This type of packed column reactor is believed to be a significant development for possible commercial exploitation of the ATRP process.

84 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023140
2022274
2021224
2020426
2019772
2018828