Adsorption of weak polyelectrolytes on amphoteric oxide surfaces
| Autor: | N.G. Hoogeveen, Remco Tuinier, M. A. Cohen Stuart, C.W. Hoogendam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Carboxymethylcellulose Hydrodynamic radius Polymers and Plastics Laboratorium voor Fysische chemie en Kolloïdkunde General Chemical Engineering Diffusion Layer thickness Inorganic chemistry Oxide Cationic polymerization Light scattering Polymer Polyelectrolyte Methacrylate Analytical Chemistry chemistry.chemical_compound Adsorption chemistry Physical Chemistry and Colloid Science |
| Zdroj: | International Journal of Polymer Analysis and Characterization, 1, 315-328 International Journal of Polymer Analysis and Characterization 1 (1995) |
| ISSN: | 1023-666X |
| Popis: | The adsorption of a weakly cationic polyelectrolyte (poly(dimethylaminoethyl methacrylate), (AMA) and a weakly anionic polyelectrolyte (carboxymethylcellulose, CMC), were studied as a function of pH. As substrates we used the (amphoteric) metal oxides TiO2 and Fe2O3. Adsorption of CMC on to colloidal particles was determined from the solution depletion; adsorption of AMA was followed by a reflectometric method. In addition, layer thicknesses were measured. These were determined from the increase in hydrodynamic radius of diffusing colloidal particles. For proper data interpretation, the effects of free polymer on diffusion were also carefully analysed, and it was found that the friction on small particles is intermediate between that exerted by the pure solvent, and that expected on the basis of solution viscosity. The adsorbed amounts showed in both cases a downward trend with increasing polymer charge density, in agreement with an ion-exchange mechanism of adsorption that is expected if electro... |
| Databáze: | OpenAIRE |
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