a.Department of Physics, Jiangxi Agricultural University, Nanchang 330045, China
b.Lucheng College, Wenzhou Polytechnic, Wenzhou 325006, China
c.College of data science, Jiaxing University, Jiaxing 314001, China
d.Department of Physics, Zhejiang University, Hangzhou 310027, China
lxzhang@zju.edu.cn
收稿:2022-05-28,
修回:2022-7-4,
录用:2022-7-12,
网络首发:2022-10-09,
纸质出版:2023-03-01
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Yang, Z. Y.; Lin, W. L.; Chai, A. H.; Lu, D.; Kang, N. Q.; Zhang, L. X. Conformational behavior of single circular semiflexible polyelectrolyte in the presence of multivalent counterions. Chinese J. Polym. Sci. 2023, 41, 448–458
Zhi-Yong Yang, Wen-Long Lin, Ai-Hua Chai, et al. Conformational Behavior of Single Circular Semiflexible Polyelectrolyte in the Presence of Multivalent Counterions[J]. Chinese Journal of Polymer Science, 2023, 41(3): 448-458.
Yang, Z. Y.; Lin, W. L.; Chai, A. H.; Lu, D.; Kang, N. Q.; Zhang, L. X. Conformational behavior of single circular semiflexible polyelectrolyte in the presence of multivalent counterions. Chinese J. Polym. Sci. 2023, 41, 448–458 DOI: 10.1007/s10118-022-2842-x.
Zhi-Yong Yang, Wen-Long Lin, Ai-Hua Chai, et al. Conformational Behavior of Single Circular Semiflexible Polyelectrolyte in the Presence of Multivalent Counterions[J]. Chinese Journal of Polymer Science, 2023, 41(3): 448-458. DOI: 10.1007/s10118-022-2842-x.
The typical conformations of a circular semiflexible polyelectrolyte in the presence of trivalent counterions are studied using the molecular dynamics simulation package LAMMPS. By changing the bending energy b and charged density A
The circular semiflexible polyelectrolyte can form several different typical conformations
such as oblated ring
rod
toroid and globule.
Langevin dynamics simulations are employed to explore the effects of chain stiffness and electrostatic interaction (EI) on the conformational behavior of a circular semiflexible polyelectrolyte (CSPE) in presence of trivalent counterions. We investigate the effect of bending energy
b
and the dimensionless Bjerrum length
A
on the conformational behavior of the CSPE with a fixed chain length. The competition among the EIs
chain stiffness and entropy of the system leads to rich conformations for the CSPE. As the
b
is less than or equal to 50
The shape of the CSPE changes from a oblate ring to a rod at small
A
then to a toroid at intermediate
A
and finally to a globule at very large
A
. However
the globular conformation is not observed for large
b
. In addition
we find that the number of torus ring increases with
A
increase
while decreases with
b
increase. This study should be helpful in gaining insight into the conformational behaviour of charged biopolymer.
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