| Autor: |
Wolterink, J. Klein, Barkema, G. T., Stuart, M. A. Cohen |
| Zdroj: |
Macromolecules; March 2005, Vol. 38 Issue: 5 p2009-2014, 6p |
| Abstrakt: |
Monte Carlo simulations are performed of adsorbed polymers with various polymer lengths N and adsorption energies χs. Exchange times and the rates of lateral diffusion (along the surface) are investigated as a function of N and χs. Lateral diffusion is found to be a combination of reptation (diffusion of stored length along the chain) which is hardly affected by χs and dominates for longer polymers, and Rouse-like behavior (sideways movement), which is strongly affected by χs and dominates for shorter polymers. We relate the characteristic time for exchange of adsorbed polymers, as a function of polymer length N and adsorption energy χs, to the bulk diffusion coefficient at the surface density, to the polymer length and to the ratio of the surface and bulk densities. The differences of 2 and 3 orders in magnitude of the exchange times at fixed χs and N, respectively, can thus be reduced to factors of 4 and 2. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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