Charge density coordination and dynamics in a rodlike polyelectrolyte.
Charge density coordination and dynamics in a rodlike polyelectrolyte.
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DOI：
10.1103/physreve.78.021904
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
Won Kyu Kim;W. Sung
中科院分区：
文献类型：
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作者：
Won Kyu Kim;W. Sung
研究了离子溶液中棒状聚合物链段电荷密度涨落的静态和动态关联函数。该聚合物是由一个有效的哈密顿量，它包含了库仑之间的相互作用的波动电荷屏蔽的离子流体环境。我们分析计算了相关函数，并讨论了电荷分布和动力学如何影响的反价和浓度的电解质。我们发现，电荷关联表现出一个欠阻尼振荡的波长可比的反粒子的大小和振幅增加的反价。电荷密度的动态相关性随反价和浓度的变化而衰减。多价性引起的相关性比一维扩散给出的衰减更快。
We study static and dynamic correlation functions of segmental charge density fluctuation on a rodlike polymer in ionic solutions. The polymer is described by an effective Hamiltonian which incorporates the Coulomb interaction between fluctuating charges screened by ionic fluid environment. We analytically calculate the correlation functions and discuss how charge distribution and dynamics are affected by counterion valency and concentration in electrolyte. We find that the charge correlation exhibits an underdamped oscillation with a wavelength comparable to the counterion size and with the amplitude increasing with the counterion valency. The dynamic correlation of charge density is shown to decay with a characteristic time varying with the counterion valency and concentration. The multivalency gives rise to faster decay of the correlation than that given by one dimensional diffusion.