Dynamics of Na+-polystyrene sulphonate in solution at low ionic strength
| Autor: | F Gruner, W P Lehmann, H Fahlbusch, R Weber |
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| Rok vydání: | 1981 |
| Předmět: |
Range (particle radiation)
Materials science Diffusion Analytical chemistry General Physics and Astronomy Statistical and Nonlinear Physics Fluid mechanics Power law Polyelectrolyte Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Nuclear magnetic resonance Monomer Dynamic light scattering chemistry Molecule Mathematical Physics |
| Zdroj: | Journal of Physics A: Mathematical and General. 14:L307-L313 |
| ISSN: | 1361-6447 0305-4470 |
| Popis: | The dynamics of Na+-Polystyrene-Sulfonate (Na+-PSS) of molecular weight 105 in water of low ionic strength was investigated by photon correlation spectroscopy. The cooperative diffusion coefficient obtained from the first cumulant was measured in a concentration range of five decades. Concentrations range from the dilute (c > c*) to the semi dilute (c* > c > c**)3 to the concentrated regime. The overlap concentration is c*≈ 10–4 g/cm3 which corresponds to 3 x 10–7 monomers/A3 It is in good agreement with the overlap concentration calculated for fully extended rodlike molecules. In the dilute regime, the diffusion coefficient is smaller than the one of a gaussian coil. This may be explained by the assumption of a rodlike shape of the molecule. In the semi dilute regime the cooperative diffusion coefficient follows a power law Deff ≈ c 0.52 ± 0.02 in good agreement with theoretical predictions for polyelectrolytes. |
| Databáze: | OpenAIRE |
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