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arXiv 0908.1085cond-mat.soft
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拓扑结构对拉伸下聚合物纽结动力学的影响

Effect of topology on dynamics of knots in polymers under tension

R. Matthews, A. A. Louis, J. M. Yeomans

摘要:

我们使用计算机模拟比较的动态行为的环面和均匀扭曲的张力下的聚合物结。这些结通过一种类似于爬行的机制扩散。两种结型的摩擦系数均随平均结长线性增长。然而,对于类似的复杂性,环面结比均匀扭曲结扩散得更快。结长度自动关联函数表现出与呼吸模式相关的缓慢弛豫时间。它的时间尺度取决于结的类型,通常环面的时间比均匀扭曲结的时间长。动力学行为的这些差异被解释在结的拓扑特征。

英文摘要:

We use computer simulations to compare the dynamical behaviour of torus and even-twist knots in polymers under tension. The knots diffuse through a mechanism similar to reptation. Their friction coefficients grow linearly with average knot length for both knot types. For similar complexity, however, the torus knots diffuse faster than the even twist knots. The knot-length auto-correlation function exhibits a slow relaxation time that can be linked to a breathing mode. Its timescale depends on knot type, being typically longer for torus than for even-twist knots. These differences in dynamical behaviour are interpreted in terms of topological features of the knots.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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