Debye Screening Effect on Scaling Behavior of Longest Relaxation Time of Biological Polyelectrolyte Chain

Title
Debye Screening Effect on Scaling Behavior of Longest Relaxation Time of Biological Polyelectrolyte Chain
Authors
이정용성정문윤규전명석정현욱
Keywords
Polyelectrolyte; Mesoscale simulation; Relaxation time; Scaling law; Debye screening
Issue Date
2013-12
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 34, NO 12, 3703-3708
Abstract
The scaling relationship of the longest relaxation time of a single chain of semiflexible biological polyelectrolyte has been investigated by performing well-established coarse-grained Brownian dynamics simulations. Two kinds of longest relaxation times were estimated from time-sequences of chain trajectories, and their behaviors were interpreted by applying the scaling law for different molecular weights of polyelectrolyte and Debye lengths. The scaling exponents for longest stress relaxation and rotational relaxation are found in the ranges of 1.67-1.79 and 1.65-1.81, respectively, depending on the physicochemical interaction of electrostatic Debye screening. The scaling exponent increases with decreasing screening effect, which is a special feature of polyelectrolytes differing from neutral polymers. It revealed that the weak screening allows a polyelectrolyte chain to follow the behavior in good solvent due to the strong electrostatic repulsion between beads.
URI
http://pubs.kist.re.kr/handle/201004/47009
ISSN
02532964
Appears in Collections:
KIST Publication > Article
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