Effective force between confined colloids clothed by end-grafted polymer chains in solution
| Autor: | M. Benhamou, F. Benzouine, M. Himmi |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 118:4759-4765 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1543942 |
| Popis: | We consider colloidal particles clothed each by f end-grafted polymer chains, and immersed in a good solvent. The clothed particles are small enough to be regarded as star polymers. The purpose is a quantitative study of the influence of the confinement on the expression of the effective force between a pair of particles. Such a force originates from the swelling of grafted chains due to the presence of solvent. To simplify, we chose as confining geometry a thin space of thickness D delimited by two parallel plates. The problem depends on two natural lengths, which are the gyration radius, R3∼af1/5N3/5, of an isolated star polymer and the thickness D. Thus, there exist two regimes depending on whether R3 is smaller or greater than D. The system is confined only when D is below R3. We first present a detailed study of conformations of a confined star polymer (R3≫D). The confinement imposes to the star polymer to adopt a configuration parallel to the plates, which is characterized by a parallel radius, deno... |
| Databáze: | OpenAIRE |
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