Dynamic scattering from solutions of semiflexible polymers
Dynamic scattering from solutions of semiflexible polymers
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DOI：
10.1103/physreve.55.3092
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发表时间：
1997-03-01
影响因子：
2.4
通讯作者：
Frey, E
中科院分区：
文献类型：
--
作者：
Kroy, K;Frey, E
从蠕虫链模型出发，导出了溶液中半柔性聚合物的动态结构因子。特别注意的刚性约束的不可扩展的轮廓和他的流体动力学的相互作用。对于稀溶液和半稀溶液的情况，得到了初始斜率的精确表达式。当流体动力学相互作用的重正化摩擦系数的水平上处理，由于结构松弛的结构因子的衰减服从拉伸指数律与肌动蛋白的实验一致。我们展示了系统的特征参数（持续长度l（p）、分子的横向直径a和网络的网格尺寸xi（m））如何容易地由散射波长λ服从远小于λ且λ < xi（m）的单个散射实验确定。我们还找到了有效（波矢相关）动力学指数z（k）的精确显式表达式
The dynamic structure factor of semiflexible polymers in solution is derived from the wormlike chain model. Special attention is paid to the rigid constraint of an inextensible contour and to he hydrodynamic interactions. For the cases of dilute and semidilute solutions exact expressions for the initial slope are obtained. When the hydrodynamic interaction is treated on the level of a renormalized friction coefficient, the decay of the structure factor due to the structural relaxation obeys a stretched exponential law in agreement with experiments on actin. We show how the characteristic parameters of the system (the persistence length l(p), the lateral diameter a of the molecules, and the mesh size xi(m) of the network) are readily determined by a single scattering experiment with scattering wavelength lambda obeying a much less than lambda much less than l(p) and lambda < xi(m). We also find an exact explicit expression for the effective (wave-vector-dependent) dynamic exponent z(k)