Rupprecht, H. and Sigg, J. (1997) Influence of pore size on the adsorption of decyl- and tetradecylpyridinium chloride onto porous silicas from aqueous solutions. POLISH JOURNAL OF CHEMISTRY, 71 (5). pp. 657-664. ISSN 0137-5083
Full text not available from this repository.Abstract
The adsorption of decyl- and tetradecylpyridinium chloride was studied on silicas with different pore sizes in the mesopore range and on nonporous silicas at pH 7. From adsorption isotherms of surfactant ions and their chloride counterions the part of surfactant, bound by ion exchange via electrostatic interactions and the part of surfactant, adsorbed by hydrophobic bonding, forming surface aggregates was evaluated. With decreasing pore size of the silicas surface aggregation decreases more than ion exchange on the surface. At pH 9 only the part of ion exchange is increased while total adsorption remains almost constant in a mesoporous support. An additional contribution of hydrophobic bonding even to the adsorption of surfactant ions via ion exchange is demonstrated by the different adsorption behavior of decyl- and tetradecylpyridinium ions to silica. From the saturation values of the surfactants on the silicas it is suggested that aggregate structures exist on the surface at pH 7 which are formed by a partial fusion of isolated aggregates formed at lower pH values.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CATIONIC SURFACTANT ADSORPTION; WATER OXIDE INTERFACES; IONIC SURFACTANTS; THEORETICAL APPROACH; ANIONIC SURFACTANTS; MECHANISM; SHAPE; cationic surfactant; porous silica; adsorption; pore size |
| Subjects: | 600 Technology > 615 Pharmacy |
| Divisions: | Chemistry and Pharmacy > Institute of Pharmacy |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 May 2023 07:42 |
| Last Modified: | 09 May 2023 07:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50866 |
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