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Title:
Anomalous viscosity exponent in a discretized model for a chain diffusion in one dimension
Authors:
Guidoni, S. E.; Mártin, H. O.; Aldao, C. M.
Affiliation:
AA(Institute of Materials Science and Technology (INTEMA), Universidad Nacional de Mar del Plata-CONICET, Juan B. Justo 4302, 7600 Mar del Plata, Argentina), AB(Physics Department, School of Exact and Natural Sciences, Universidad Nacional de Mar del Plata, Deán Funes 3350, 7600 Mar del Plata, Argentina), AC(Institute of Materials Science and Technology (INTEMA), Universidad Nacional de Mar del Plata-CONICET, Juan B. Justo 4302, 7600 Mar del Plata, Argentina; )
Publication:
The European Physical Journal E, Volume 7, Issue 3, March 2002, pp.291-295
Publication Date:
03/2002
Origin:
EDP Sciences
PACS Keywords:
Diffusion and thermal diffusion, Reptation and tube theories
DOI:
10.1140/epje/i200102018
Bibliographic Code:
2002EPJE....7..291G

Abstract

We present a one-dimensional Monte Carlo simulation for the diffusion motion of a chain of N beads. We found that the scaling exponent for the viscosity can be smaller or greater than 3. This anomalous behavior cannot be attributed to the diffusivity scaling or the length fluctuations but is due to the chain dynamics details during diffusion in which the end beads play the key role. The viscosity exponent 3 and its expected relation with the diffusivity exponent are recovered in the asymptotic regime (N to infty ).
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Physics
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