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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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
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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| Summary: | 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. |
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| ISSN: | 0263-6174 2048-4038 |