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arXiv 2406.14741cond-mat.soft
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溶液中受限驱动聚合物的阻塞交叉现象

Jamming Crossovers in a Confined Driven Polymer in Solution

The University of Western Ontario(韦仕敦大学)

Setarehalsadat Changizrezaei, Mikko Karttunen, Colin Denniston

AI总结:

本研究通过LBMD模拟探究受限驱动聚合物的压缩行为,发现当推动胶体速度超过阈值时,链会出现后端致密、前端非致密的伪两态共存的阻塞交叉现象,并分析了其动力学特征。

摘要:

我们采用格子玻尔兹曼分子动力学(LBMD,lattice-Boltzmann molecular dynamics)模拟方法,研究浸没在流体中、受直径与通道宽度相当的大球形胶体推动的受限聚合物的压缩过程。我们考察了单体间施加纯排斥和弱吸引Lennard-Jones(LJ,伦纳德-琼斯)势两种情况下的链形变行为,球形胶体的速度在3个数量级范围内变化。对于排斥和吸引单体相互作用两种情形,链在低推动速度下均处于非致密状态。当球形胶体速度超过阈值$v^*$时,链的后端转变为高密度状态,单体均方位移(MSD,mean square displacement)值较低;而前端仍保持非致密状态,MSD较高,呈现出伪两态共存特征。这种交叉现象也可通过单体体积和MSD随球形胶体速度的变化规律体现。我们还通过研究不同时刻的折叠事件,探究了聚合物的动力学行为。

英文摘要:

We use lattice-Boltzmann molecular dynamics (LBMD) simulations to study the compression of a confined polymer immersed in a fluid and pushed by a large spherical colloid with a diameter comparable to the channel width. We examined the chain's deformation with both purely repulsive and weakly attractive Lennard-Jones (LJ) potentials applied between the monomers. The sphere's velocity was varied over 3 orders of magnitude. The chain is in a non-dense state at low pushing velocities for both repulsive and attractive monomer interactions. When the velocity of the spherical colloid exceeds a threshold $v^*$, the back end of the chain transitions to a high density state with low mean square monomer displacement (MSD) values. The front end, however, remains in a non-dense state with high MSD indicating a pseudo two-state coexistence. This crossover is also revealed through volume per monomer and MSD as a function of the sphere's velocity. We also studied polymer dynamics by investigating folding events at different times.

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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