Characterization of a thermally and chemically modified silica surface by infrared spectroscopy using the mull technique

Venne, J.L.M. van de; Rindt, J. P. M.; Coenen, G.J.

doi:10.1016/0021-9797(80)90191-5

Cited by 22 publications

(2 citation statements)

References 13 publications

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“…After reaction, the SiO 2 was analyzed with IR and solid-state NMR spectroscopy and thermogravimetric analysis (TGA). The IR spectra were taken in poly(chlorotrifluoroethylene) at a concentration of 100 mg/mL and a cell path length of 0.2 mm, conditions that assure quantitative determination of surface species . The embedding liquid induces a shift of the surface hydroxyl groups to 3715 cm -1 from ca.…”

Section: Resultsmentioning

confidence: 99%

“…IR spectra of silica evacuated at 120 °C show, before treatment with trialkoxymethanes, absorptions that could stem from vicinal hydroxyl groups (Figure ). , Reactions with vicinal surface hydroxyl groups must, therefore, also be considered. On the one hand, these groups could react with trialkoxymethanes analogously to the reaction shown in Figure .…”

Section: Discussionmentioning

confidence: 99%

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Modification of SiO₂ Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Guidotti¹,

Caseri²,

Suter³

1996

Langmuir

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SiO2 (Aerosil) reacts with trialkoxymethanes and triaryloxymethanes (orthoformates) of the formula HC(OR)3, R = CH3, C2H5, n-C4H9, and C6H5. The modified surface was analyzed with IR and solid-state NMR spectroscopy and thermogravimetric analysis (TGA). The results show that only the alkyl (or aryl) residues are left on the surface (as part of alkoxy or aryloxy groups). Alkyl residues are more tightly bound to the surface than aryl residues. The reaction of SiO2 with trialkoxymethanes allows stable modifications with organic products in the range of monolayer coverage, with little effort.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modification of SiO₂ Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Guidotti¹,

Caseri²,

Suter³

1996

Langmuir

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Thermal and textural characteristics of modified silica

Selim

Hanafi

Abdel-Khalik

et al. 1985

J. Chem. Tech. Biotechnol.

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A silica gel characterised as predominently microporous, with the remaining pores of limited dimensions which do not permit capillary condensation, is modified with aqueous solutions of acetic acid, glycine and p-alanine. The modified samples are investigated and compared with a water soaked sample by means of differential thermal analysis, thermogravimetry and i.r. spectroscopy. Textural measurements are also carried out on the parent samples and those produced in the temperature range 11G6OO"C. Acetic acid is both physically and chemically adsorbed; a surface ester is formed. Both amino acids are physically adsorbed but no chemical interaction has been detected. Glycine andp-alanine decompose differently when adsorbed on to the silica surface than when in the pure state. The specific surface area decreases upon modification, reaching half the value of the pure silica for the P-alanine modified sample. Pore structure analysis, shows that the microporous nature of the modified samples decreases in the modifier order acetic acid

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Preparation of reversed‐phase high‐performance thin‐layer plates by in situ reaction with monochlorosilanes

Ericsson

Blomberg

1983

J. High Resol. Chromatogr.

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SummaryThe conditions for in situ chemical modification of commercially available thin-layer plates have been varied and the influence thereof upon reversed phase plate properties has been studied. The reaction variables studied were: average silica pore size, silica water content, use of tri-or monochlorosilanes as modifiers, reaction temperature, and additionof base.Coverage and activity of residual silanol groups was studied on modified plates.Desired plate properties are high speed of development in aqueous solvents and low content of active residual silanol groups. Under the conditions tested, the lowest amount of residual silanols was achieved at the expense of the speed of development in aqueous media and vice versa.

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Characterization of a thermally and chemically modified silica surface by infrared spectroscopy using the mull technique

Cited by 22 publications

References 13 publications

Modification of SiO₂ Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Modification of SiO₂ Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Thermal and textural characteristics of modified silica

Preparation of reversed‐phase high‐performance thin‐layer plates by in situ reaction with monochlorosilanes

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Characterization of a thermally and chemically modified silica surface by infrared spectroscopy using the mull technique

Cited by 22 publications

References 13 publications

Modification of SiO2 Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Modification of SiO2 Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Thermal and textural characteristics of modified silica

Preparation of reversed‐phase high‐performance thin‐layer plates by in situ reaction with monochlorosilanes

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Product

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Modification of SiO₂ Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane

Modification of SiO₂ Surfaces by Reaction with Trialkoxymethanes and Triphenoxymethane