Hu Han-Xian, Shen Yi-Fan, Wang Chao, Luo Meng-Bo
Department of Physics, Zhejiang University, Hangzhou 310027, Zhejiang, China.
Department of Physics, Taizhou University, Taizhou 318000, Zhejiang, China.
Soft Matter. 2022 Nov 30;18(46):8820-8829. doi: 10.1039/d2sm01139e.
The dynamics of a two-dimensional active polymer composed of an active Brownian particle (ABP) at the head and a passive polymer chain is investigated using Langevin dynamics simulation. The ABP experiences a self-propulsion force and a resistance torque as the passive polymer chain is bonded to the edge of the ABP. restricts the rotation of the ABP, and thus the dynamics of the ABP and that of the whole active polymer are influenced significantly. Due to this restriction, the persistence time , which characterizes the random rotation of the ABP, is increased significantly and changes non-monotonically with the rotational friction coefficient . Our simulation results show that the effect of on the dynamics of the active polymer can be characterized mainly by the change of . Moreover, the propulsive diffusion coefficient of the whole polymer chain originated from the self-propulsion force can be described by a scaling relation ∝ / with the translational friction coefficient and the polymer length. Our results show that the diffusion is promoted by the resistance torque and is a key factor for the diffusion of active polymers.
使用朗之万动力学模拟研究了一种二维活性聚合物的动力学，该聚合物由头部的活性布朗粒子（ABP）和被动聚合物链组成。当被动聚合物链连接到ABP的边缘时，ABP会受到自推进力和阻力矩。阻力矩限制了ABP的旋转，因此ABP的动力学以及整个活性聚合物的动力学都受到显著影响。由于这种限制，表征ABP随机旋转的持续时间显著增加，并随旋转摩擦系数非单调变化。我们的模拟结果表明，阻力矩对活性聚合物动力学的影响主要可以通过持续时间的变化来表征。此外，源于自推进力的整个聚合物链的推进扩散系数可以用标度关系 ∝ / 来描述，其中 是平动摩擦系数， 是聚合物长度。我们的结果表明，扩散受到阻力矩的促进，并且阻力矩是活性聚合物扩散的关键因素。
