Debye screening effect on scaling behavior of longest relaxation time of biological polyelectrolyte chain

Jeong Yong Lee, Jung Mun Sung, Kyu Yoon, Myung Suk Chun, Hyun Wook Jung

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)3703-3708
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume34
Issue number12
DOIs
Publication statusPublished - 2013 Dec 20

Keywords

  • Debye screening
  • Mesoscale simulation
  • Polyelectrolyte
  • Relaxation time
  • Scaling law

ASJC Scopus subject areas

  • Chemistry(all)

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