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首页> 外文期刊>The Journal of Chemical Physics >Internal dynamics of semiflexible polymers with active noise
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Internal dynamics of semiflexible polymers with active noise

机译：具有主动噪声的半弯曲聚合物的内部动态

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摘要

The intramolecular dynamics of flexible and semiflexible polymers in response to active noise is studied theoretically. The active noise may either originate from interactions of a passive polymer with a bath of active Brownian particles or the polymer itself is comprised of active Brownian particles. We describe the polymer by the continuous Gaussian semiflexible-polymer model, taking into account the finite polymer extensibility. Our analytical calculations predict a strong dependence of the polymer dynamics on the activity. In particular, active semiflexible polymers exhibit a crossover from a bending elasticity-dominated dynamics at weak activity to that of flexible polymers at strong activity. The end-to-end vector correlation function decays exponentially for times longer than the longest polymer relaxation time. Thereby, the polymer relaxation determines the decay of the correlation function for long and flexible polymers. For shorter and stiffer polymers, the relaxation behavior of individual active Brownian particles dominates the decay above a certain activity. The diffusive dynamics of a polymer is substantially enhanced by the activity. Three regimes can be identified in the mean square displacement for sufficiently strong activities: an activity-induced ballistic regime at short times, followed by a Rouse-type polymer-specific regime for any polymer stiffness, and free diffusion at long times, again determined by the activity. Published by AIP Publishing.
机译：从理论上研究了响应于主动噪声的柔性和半弯曲聚合物的分子内动态。活性噪声可以源自具有活性褐色颗粒的浴的被动聚合物的相互作用，或者聚合物本身由活性褐色颗粒组成。我们通过连续高斯半弯曲 - 聚合物模型描述了聚合物，考虑了有限的聚合物可伸展性。我们的分析计算预测了聚合物动力学对活动的强烈依赖。特别地，活性半成品聚合物在弱活性下表现出从弱活性的弯曲弹性主导的动态的交叉。端到端向量相关函数逐渐衰减，以比最长的聚合物弛豫时间长时间逐渐衰减。由此，聚合物弛豫确定长且柔性聚合物的相关函数的衰减。对于较短的聚合物，个体活性褐色颗粒的松弛行为在某种活动之上占据衰减。通过活性基本上增强了聚合物的扩散动力学。在平均方向性中可以识别三个制度，以获得足够强烈的活动：在短时间内的活动引起的弹道制度，其次是任何聚合物刚度的rouse型聚合物特异性制度，并且在长时间的自由扩散再次确定活动。通过AIP发布发布。

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