Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas
Silicas having a highly extended outer surface, i.e. silicas precipitated from sodium metasilicate solutions, were used as the raw materials in the present study. Highly dispersed silicas were modified with silane coupling agents to decrease their surface hydrophilicity. The modification procedure w...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
1999-03-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361749901700304 |
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| author | A. Voelkel A. Krysztafkiewicz T. Grześkowiak |
| author_facet | A. Voelkel A. Krysztafkiewicz T. Grześkowiak |
| author_sort | A. Voelkel |
| collection | DOAJ |
| description | Silicas having a highly extended outer surface, i.e. silicas precipitated from sodium metasilicate solutions, were used as the raw materials in the present study. Highly dispersed silicas were modified with silane coupling agents to decrease their surface hydrophilicity. The modification procedure was optimized, e.g. by the change of the modifier amounts added. Modified silicas were characterized by means of inverse gas chromatography at infinite dilution through the estimation of their dispersive and acid–base characteristics. The dispersive component of the surface free energy γ d s , the specific increment of the free energy of adsorption ΔG S , and the parameters K D and K A characterizing the ability of the surface to act as an electron donor and an electron acceptor, respectively, as well as S C = K D /K A , were used in this study. The physicochemical status of the modifier monolayer was described by a solubility parameter and its components. The influence of the surface character of the raw material, the modifier structure and its amount on the surface properties of the modified material is presented and discussed. |
| format | Article |
| id | doaj-art-f107e57182594af584568527b14f2bfe |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 1999-03-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-f107e57182594af584568527b14f2bfe2025-01-02T23:12:07ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40381999-03-011710.1177/026361749901700304Inverse Gas Chromatography in the Examination of Modified Highly Dispersed SilicasA. VoelkelA. KrysztafkiewiczT. GrześkowiakSilicas having a highly extended outer surface, i.e. silicas precipitated from sodium metasilicate solutions, were used as the raw materials in the present study. Highly dispersed silicas were modified with silane coupling agents to decrease their surface hydrophilicity. The modification procedure was optimized, e.g. by the change of the modifier amounts added. Modified silicas were characterized by means of inverse gas chromatography at infinite dilution through the estimation of their dispersive and acid–base characteristics. The dispersive component of the surface free energy γ d s , the specific increment of the free energy of adsorption ΔG S , and the parameters K D and K A characterizing the ability of the surface to act as an electron donor and an electron acceptor, respectively, as well as S C = K D /K A , were used in this study. The physicochemical status of the modifier monolayer was described by a solubility parameter and its components. The influence of the surface character of the raw material, the modifier structure and its amount on the surface properties of the modified material is presented and discussed.https://doi.org/10.1177/026361749901700304 |
| spellingShingle | A. Voelkel A. Krysztafkiewicz T. Grześkowiak Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas Adsorption Science & Technology |
| title | Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas |
| title_full | Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas |
| title_fullStr | Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas |
| title_full_unstemmed | Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas |
| title_short | Inverse Gas Chromatography in the Examination of Modified Highly Dispersed Silicas |
| title_sort | inverse gas chromatography in the examination of modified highly dispersed silicas |
| url | https://doi.org/10.1177/026361749901700304 |
| work_keys_str_mv | AT avoelkel inversegaschromatographyintheexaminationofmodifiedhighlydispersedsilicas AT akrysztafkiewicz inversegaschromatographyintheexaminationofmodifiedhighlydispersedsilicas AT tgrzeskowiak inversegaschromatographyintheexaminationofmodifiedhighlydispersedsilicas |