活性粒子诱导的二嵌段链的开折叠及其反常扩散
Unfolding of a diblock chain and its anomalous diffusion induced by active particles
摘要：
在二维模型系统中，采用扩展布朗动力学方法研究了两嵌段共聚物链在活性布朗粒子（ABPs）浴中的结构和动力学行为。具体来说，链的A嵌段是自吸引的，而B嵌段是自排斥的。我们发现，超过一个阈值，A块以一种模式展开，就像从一个球中抽出一根羊毛线。临界力随B块长度NB的增加而减小，在较短的情况下，随着NB的进一步增加，临界力保持不变。此外，我们发现链的展开时间与作用力Fa和NB之间存在幂律关系。最后，我们重点研究了链的平移和转动扩散，发现由于ABPs的不对称分布，对于小的作用力，它们在长时间内都保持超扩散。我们的研究结果开辟了新的路线，操纵聚合物的行为与ABPs。
英文摘要：
We study the structural and dynamical behaviors of a diblock copolymer chain in a bath of active Brownian particles (ABPs) by extensive Brownian dynamics simulation in a two-dimensional model system. Specifically, the A block of chain is self-attractive, while the B block is self-repulsive. We find, beyond a threshold, the A block unfolds with a pattern like extracting a woolen string from a ball. The critical force decreases with the increase of the B block length,NB, for short cases, then keeps a constant with further increase of NB. In addition, we find a power law exists between the unfolding time of chain and active force, Fa, as well as NB. Finally, we focus on the translational and rotational diffusion of chain, and find that both of them remain supper-diffusive at the long time limit for small active forces due to an asymmetry distribution of ABPs. Our results open new routes for manipulating polymer's behaviors with ABPs.
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