Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film
A method of synthesizing modified silica with a dense grafted phenylpolysiloxane layer is described. Gas chromatography at zero surface coverage has been used for investigating the adsorption properties of both modified and initial silicas. It was shown that the thermodynamic parameters for retentio...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
1998-05-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361749801600501 |
| _version_ | 1826904067284140032 |
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| author | T.M. Roshchina K.B. Gurevich A.Y. Fadeev |
| author_facet | T.M. Roshchina K.B. Gurevich A.Y. Fadeev |
| author_sort | T.M. Roshchina |
| collection | DOAJ |
| description | A method of synthesizing modified silica with a dense grafted phenylpolysiloxane layer is described. Gas chromatography at zero surface coverage has been used for investigating the adsorption properties of both modified and initial silicas. It was shown that the thermodynamic parameters for retention (retention volume, V a ; heat, q; and entropy, ΔS 0 , of adsorption) and the Kovats retention indices I for different classes of organic compounds are essentially changed with surface modification. The increase in V a and q for n-alkanes on phenyl-bonded silica was interpreted as due to penetration of the solutes into the grafted phenylpolysiloxane layer. The significant reduction in retention parameters for all compounds capable of specific interaction, including the formation of hydrogen bonds, on the phenyl-bonded silica relative to the initial silica has allowed conclusions to be drawn regarding the weak role of residual silanol groups in the retention process. These conclusions have been confirmed by a comparison of the chromatographic properties of phenyl-bonded silica and the polymethylphenylsiloxanes OV-17 and OV-25. |
| first_indexed | 2024-03-07T17:33:47Z |
| format | Article |
| id | doaj.art-2026936596f84acb81f3fad393a3bd69 |
| institution | Directory Open Access Journal |
| issn | 0263-6174 2048-4038 |
| language | English |
| last_indexed | 2025-02-17T08:06:29Z |
| publishDate | 1998-05-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-2026936596f84acb81f3fad393a3bd692025-01-03T00:10:42ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40381998-05-011610.1177/026361749801600501Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane FilmT.M. RoshchinaK.B. GurevichA.Y. FadeevA method of synthesizing modified silica with a dense grafted phenylpolysiloxane layer is described. Gas chromatography at zero surface coverage has been used for investigating the adsorption properties of both modified and initial silicas. It was shown that the thermodynamic parameters for retention (retention volume, V a ; heat, q; and entropy, ΔS 0 , of adsorption) and the Kovats retention indices I for different classes of organic compounds are essentially changed with surface modification. The increase in V a and q for n-alkanes on phenyl-bonded silica was interpreted as due to penetration of the solutes into the grafted phenylpolysiloxane layer. The significant reduction in retention parameters for all compounds capable of specific interaction, including the formation of hydrogen bonds, on the phenyl-bonded silica relative to the initial silica has allowed conclusions to be drawn regarding the weak role of residual silanol groups in the retention process. These conclusions have been confirmed by a comparison of the chromatographic properties of phenyl-bonded silica and the polymethylphenylsiloxanes OV-17 and OV-25.https://doi.org/10.1177/026361749801600501 |
| spellingShingle | T.M. Roshchina K.B. Gurevich A.Y. Fadeev Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film Adsorption Science & Technology |
| title | Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film |
| title_full | Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film |
| title_fullStr | Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film |
| title_full_unstemmed | Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film |
| title_short | Gas Chromatographic Characterization of Silica Bonded with a Phenylpolysiloxane Film |
| title_sort | gas chromatographic characterization of silica bonded with a phenylpolysiloxane film |
| url | https://doi.org/10.1177/026361749801600501 |
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