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arXiv 2109.10001cond-mat.softcond-mat.stat-mech
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支化的上升和下降:松弛蠕虫状胶束网络中的一种减慢机制

The rise and fall of branching: a slowing down mechanism in relaxing wormlike micellar networks

Marco Baiesi, Stefano Iubini, Enzo Orlandini

摘要:

平均场动力学模型表明,蠕虫状胶束网络的弛豫动力学是一个漫长而复杂的过程,由于减少自由端帽(或悬挂端)的数量,同时也达到平衡水平的分支后,较早的过度生长的问题。该模型是对介观分子动力学模拟进行验证,是基于动力学方程占的表面活性剂滴的断裂和合成过程。一个长的弛豫时间尺度达到热猝灭和小扰动的系统。该弛豫时间的缩放与端盖的自由能和分支自由能成指数关系。我们认为,微妙的末端重组动力学可能产生的影响,是难以检测的流变学实验中,可能低估的典型时间尺度的粘弹性流体。

英文摘要:

A mean-field kinetic model suggests that the relaxation dynamics of wormlike micellar networks is a long and complex process due to the problem of reducing the number of free end-caps (or dangling ends) while also reaching an equilibrium level of branching after an earlier overgrowth. The model is validated against mesoscopic molecular dynamics simulations and is based on kinetic equations accounting for scission and synthesis processes of blobs of surfactants. A long relaxation time scale is reached both with thermal quenches and small perturbations of the system. The scaling of this relaxation time is exponential with the free energy of an end cap and with the branching free energy. We argue that the subtle end-recombination dynamics might yield effects that are difficult to detect in rheology experiments, with possible underestimates of the typical time scales of viscoelastic fluids.

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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