The use of dielectric spectroscopy for the characterization of polymer-induced flocculation of polystyrene particles
| Autor: | Peter Vittrup Christensen, Kristian Keiding |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Permittivity
Dielectric spectroscopy Flocculation Materials science Polymers Dielectric Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Cations Polymer chemistry Electrochemistry On-line measurement Particle Size Spectrum Analysis Polymer adsorption Polyelectrolyte Polystyrene particles Surfaces Coatings and Films Electronic Optical and Magnetic Materials Particle aggregation chemistry Chemical engineering Models Chemical Particle Polystyrenes Polystyrene |
| Zdroj: | Christensen, P V & Keiding, K 2008, ' The use of dielectric spectroscopy for the characterization of polymer-induced flocculation of polystyrene particles ', Journal of Colloid and Interface Science, vol. 327, no. 2, pp. 362-369 . https://doi.org/10.1016/j.jcis.2008.08.042 |
| ISSN: | 1095-7103 |
| DOI: | 10.1016/j.jcis.2008.08.042 |
| Popis: | The flocculation of colloidal suspensions is an important unit operation in many industries, as it greatly improves the performance of solid separation processes. The number of available techniques for evaluating flocculation processes on line is limited, and most of these are only functional in dilute suspensions. Thus, techniques usable for flocculation characterization in high-solids suspensions are desirable. This study investigates the use of dielectric spectroscopy to monitor the flocculation of polystyrene particles with a cationic polymer. The frequency-dependent permittivity is modeled and the model parameters are used to describe. the particle aggregation. The results show a peak in the modeled time constants of the dielectric relaxation at the onset of flocculation. Further. the adsorption of polymeric flocculant onto the particle surface results in a reduction in particle charge, evident as a decrease in the magnitude of the dielectric dispersion. The use of dielectric spectroscopy is found to be valuable for assessing flocculation processes in high-solids suspensions, as changes in parameters Such as floc size and charge can be detected. |
| Databáze: | OpenAIRE |
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