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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gregory, John Barany, Sandor |
| Description | Country affiliation: United kingdom Author Affiliation: Gregory J ( University College London, Gower Street, London WC1E 6BT, UK. j.gregory@ucl.ac.uk) |
| Abstract | Polymers of various types are in widespread use as flocculants in several industries. In most cases, polymer adsorption is an essential prerequisite for flocculation and kinetic aspects are very important. The rates of polymer adsorption and of re-conformation (relaxation) of adsorbed chains are key factors that influence the performance of flocculants and their mode of action. Polyelectrolytes often tend to adopt a rather flat adsorbed configuration and in this state their action is mainly through charge effects, including 'electrostatic patch' attraction. When the relaxation rate is quite low, particle collisions may occur while the adsorbed chains are still in an extended state and flocculation by polymer bridging may occur. These effects are now well understood and supported by much experimental evidence. In recent years there has been considerable interest in the use of multi-component flocculants, especially dual-polymer systems. In the latter case, there can be significant advantages over the use of single polymers. Despite some complications, there is a broad understanding of the action of dual polymer systems. In many cases the sequence of addition of the polymers is important and the pre-adsorbed polymer can have two important effects: providing adsorption sites for the second polymer or causing a more extended adsorbed conformation as a result of 'site blocking'. |
| File Format | HTM / HTML |
| ISSN | 00018686 |
| Issue Number | 1 |
| Journal | Advances in Colloid and Interface Science |
| Volume Number | 169 |
| e-ISSN | 18733727 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2011-11-14 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Chemistry Polymers Chemistry Adsorption Flocculation Kinetics Surface Properties Journal Article Research Support, Non-u.s. Gov't Review |
| Content Type | Text |
| Resource Type | Article |
| Subject | Colloid and Surface Chemistry Physical and Theoretical Chemistry Surfaces and Interfaces |
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