Adsorption of polyacrylic acid on titanium dioxide
| Autor: | J.M Lamarche, Alain Foissy, A El Attar |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
chemistry.chemical_classification
Polyacrylic acid Inorganic chemistry Polymer adsorption Polymer Dissociation (chemistry) Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Adsorption chemistry Dispersion stability Molar mass distribution Surface charge |
| Zdroj: | Journal of Colloid and Interface Science. 96:275-287 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/0021-9797(83)90029-2 |
| Popis: | The adsorption isotherms of polyacrylic acid on titanium dioxide (anatase) have been determined in aqueous solutions. The influence of pH, polymer's average molecular weight, and calcium concentration was investigated. Particular attention was paid to the substrate's surface charge and to the polymer's dissociation to explain the adsorption level. Incidence of the polymer adsorption on the solid's particle charge and the dispersion stability was examined. At an alkaline pH, unfavorable electrical forces lead to a low adsorption level where the adsorbed polymer was more likely to lie flat on the surface. Calcium ions gave a bidentate complex with the polymer. The adsorption was enhanced and linearly dependant on the calcium concentration. At intermediate pH adsorption was highly favored by the opposite charges of the surface and the polymer. Evidence was obtained for a flat configuration of the adsorbed molecule at low polymer concentrations, and for a gradual change to a configuration where only a few segments were directly associated with the surface, the rest being in tails or loops protruding in the solution. The solid particles' electrophoretic mobility was closely related to the polyacrylic acid adsorption and to the dispersion stability. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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