Effects of surface structural disorder and surface coverage on isotopic fractionation during Zn(II) adsorption onto quartz and amorphous silica surfaces

Fourier transform infrared photoacoustic spectroscopy has been used for quantitative surface analysis of silica treated with trifunctional coupling agents such as γ-Methacryloxypropyltriethoxysilane (γ-MPS), γ-Glycidoxypropyltrimethoxysilane (γ-GPS), and γ-Aminopropyltri-ethoxysilane (γ-APS). The calibration curves are obtained for several characteristic bands of the coupling agents. Using a highly polarizable gas in the photoacoustic cell and comparing the spectra with a nonpolarizable coupling gas, it is possible to evaluate orientation of the coupling agents on the silica surface. The type of orientation is a function of the extent of surface coverage. At low surface coverage, coupling agents tend to take a perpendicular orientation with respect to the surface, and increasing surface coverage leads to parallel orientation. Increasing the coupling agent concentration also causes orientational changes of the species which form chemical bonds with the silica surface (hydroxyl, water, and carbonyl groups).

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A quantum mechanical study of dehydration vs. decarbonylation of formamide catalysed by amorphous silica surfaces

Physical Chemistry Chemical Physics ◽

10.1039/d0cp00572j ◽

2020 ◽

Vol 22 (16) ◽

pp. 8353-8363 ◽

Cited By ~ 2

Author(s):

Stefano Pantaleone ◽

Clara Salvini ◽

Lorenzo Zamirri ◽

Matteo Signorile ◽

Francesca Bonino ◽

...

Keyword(s):

Amorphous Silica ◽

Quantum Mechanical ◽

Silica Surfaces ◽

Mechanical Study ◽

Quantum Mechanical Study ◽

Rna Bases

Towards life: production of HCN, the key molecule for DNA/RNA bases, from formamide decomposition catalysed by amorphous silica.

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First principle quantum calculation of the hydroxylation of 2-member ring defect on the amorphous silica surfaces

Journal of Industrial and Engineering Chemistry ◽

10.1016/j.jiec.2012.11.015 ◽

2013 ◽

Vol 19 (3) ◽

pp. 752-755 ◽

Cited By ~ 2

Author(s):

Min Chan Kim

Keyword(s):

Amorphous Silica ◽

First Principle ◽

Quantum Calculation ◽

Silica Surfaces

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Models for biomedical interfaces: a computational study of quinone-functionalized amorphous silica surface features

Physical Chemistry Chemical Physics ◽

10.1039/c6cp07909a ◽

2017 ◽

Vol 19 (11) ◽

pp. 7793-7806 ◽

Cited By ~ 5

Author(s):

Marta Corno ◽

Massimo Delle Piane ◽

Patrick Choquet ◽

Piero Ugliengo

Keyword(s):

Amorphous Silica ◽

Silica Surface ◽

Computational Study ◽

Antimicrobial Properties ◽

Surface Features ◽

Silica Surfaces

The structural and IR features of amorphous silica surfaces, functionalized by ortho-benzoquinone groups, were computed to obtain a deeper knowledge of multifunctional coatings with antimicrobial properties.

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