Theory of the transient electric birefringence of rod-like polyions: coupling of rotational and counterion dynamics
Theory of the transient electric birefringence of rod-like polyions: coupling of rotational and counterion dynamics
复制标题
棒状聚离子瞬态电双折射理论：旋转和反离子动力学的耦合
DOI：
--
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
D. Eden
中科院分区：
文献类型：
--
作者：
A. Szabó;Matheen Haleem;D. Eden
聚电解质的瞬态电双折射（TEB）不仅反映了大离子的旋转运动，而且还反映了周围离子气氛的动力学。在假设（1）离子气氛沿着分子长轴的畸变是诱导偶极矩的唯一来源和（2）离子气氛的动力学可以用单个弛豫时间来描述的前提下，给出了没有永久偶极矩的棒状大离子的旋转和离子气氛耦合动力学的严格公式。在低场极限下，导出并求解了宏离子具有某一取向和某一瞬时偶极矩的联合概率的耦合扩散方程。通过这种方式，当电场（1）打开，（2）反转，和（3）正弦振荡时，获得TEB的简单解析表达式。当离子大气弛豫较缓时，这些表达式退化为经典的永久偶极子结果，而当离子大气弛豫较缓时，这些表达式退化为经典的永久偶极子结果。
The transient electric birefringence (TEB) of polyelectrolytes reflects not only the rotational motion of the macroions but also the dynamics of the surrounding ion atmosphere. A rigorous formulation of the coupled rotational and ion atmosphere dynamics of a rod‐like macroion with no permanent dipole moment is presented under the assumptions that (1) distortions of the ion atmosphere along the long axis of the molecule are the only source of induced dipole moments and (2) the dynamics of the ion atmosphere can be described by a single relaxation time. A coupled diffusion equation for the joint probability that the macroion has a certain orientation and a certain instantaneous dipole moment is derived and solved in the low field limit. In this way, simple analytic expressions for the TEB are obtained when the electric field is (1) turned on, (2) reversed, and (3) oscillates sinusoidally. These expressions reduce to the classical permanent dipole results when the ion atmosphere relaxation is slow and to the...
23Na NMR 弛豫研究构象和碱基组成对反离子与双螺旋 DNA 相互作用的影响。
影响因子：
2.9
作者：
Nordenskiöld,L;Chang,DK;Anderson,CF;RecordJr,MT
通讯作者：
RecordJr,MT