Issue |
Europhys. Lett.
Volume 75, Number 1, July 2006
|
|
---|---|---|
Page(s) | 77 - 83 | |
Section | Condensed matter: structural, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2006-10067-y | |
Published online | 02 June 2006 |
Dynamic scaling in dilute polymer solutions: The importance of dynamic correlations
Department of Chemical Engineering, Monash University Melbourne, VIC 3800, Australia
Received:
16
January
2006
Accepted:
3
May
2006
The swelling of the hydrodynamic radius of a polymer, obtained using Brownian
dynamics simulations of the continuum Edwards model, is found to
obey a crossover in the excluded-volume parameter z, which is
significantly different from that observed for the swelling
of the radius of
gyration. It is shown that this difference arises due to
contributions from dynamic correlations to the diffusivity, which are
ignored in the commonly used definition of hydrodynamic radius based
on the Kirkwood expression. Simulated values of
are found to be
in remarkable agreement with experimental measurements
PACS: 61.25.Hq – Macromolecular and polymer solutions; swelling / 82.35.Lr – Physical properties of polymers / 83.10.Mj – Molecular dynamics, Brownian dynamics
© EDP Sciences, 2006
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