ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Diffusion properties of a self-avoiding polymer embedded in regularly distributed obstacles with spacing a=20 and confined in two dimensions is studied numerically using the extended bond fluctuation method which we have developed recently. We have observed for the first time to our knowledge, that the mean square displacement of a center monomer φM/2(t) exhibits four dynamical regimes, i.e., φM/2(t)∼tνm with νm∼0.6, 〈fraction SHAPE="CASE"〉38, 〈fraction SHAPE="CASE"〉34, and 1 from the shortest to longest time regimes. The exponents in the second and third regimes are well described by segmental diffusion in the "self-avoiding tube." In the fourth (free diffusion) regime, we have numerically confirmed the relation between the reptation time τd and the number of segments M, τd∝M3. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.480206
Permalink