Debye Screening Effect on Scaling Behavior of Longest Relaxation Time of Biological Polyelectrolyte Chain
- Debye Screening Effect on Scaling Behavior of Longest Relaxation Time of Biological Polyelectrolyte Chain
- 이정용; 성정문; 윤규; 전명석; 정현욱
- Polyelectrolyte; Mesoscale simulation; Relaxation time; Scaling law; Debye screening
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 34, NO 12, 3703-3708
- 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.
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