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Translational and rotational dynamics of a self-propelled Janus probe in crowded environments.
Soft Matter ( IF 2.9 ) Pub Date : 2020-08-05 , DOI: 10.1039/d0sm00339e
Ligesh Theeyancheri 1 , Subhasish Chaki 1 , Nairhita Samanta 1 , Rohit Goswami 1 , Raghunath Chelakkot 2 , Rajarshi Chakrabarti 1
Affiliation  

We computationally investigate the dynamics of a self-propelled Janus probe in crowded environments. The crowding is caused by the presence of viscoelastic polymers or non-viscoelastic disconnected monomers. Our simulations show that the translational as well as rotational mean square displacements have a distinctive three-step growth for fixed values of self-propulsion force, and steadily increase with self-propulsion, irrespective of the nature of the crowder. On the other hand, in the absence of crowders, the rotational dynamics of the Janus probe is independent of self-propulsion force. On replacing the repulsive polymers with sticky ones, translational and rotational mean square displacements of the Janus probe show a sharp drop. Since different faces of a Janus particle interact differently with the environment, we show that the direction of self-propulsion also affects its dynamics. The ratio of long-time translational and rotational diffusivities of the self-propelled probe with a fixed self-propulsion, when plotted against the area fraction of the crowders, passes through a minimum and at higher area fraction merges to its value in the absence of the crowder. This points towards the decoupling of the translational and rotational dynamics of the self-propelled probe at an intermediate area fraction of the crowders. However, such translational–rotational decoupling is absent for passive probes.

中文翻译:

在拥挤环境中自行推进的Janus探针的平移和旋转动力学。

我们在拥挤的环境中以计算方式研究了自行式Janus探针的动力学特性。拥挤是由粘弹性聚合物或非粘弹性断开的单体的存在引起的。我们的模拟结果表明,对于固定的自推进力值,平移和旋转均方位移都有明显的三步增长,并且无论拥挤者的性质如何,随着自推进力的增加,平稳增长。另一方面,在没有拥挤物的情况下,Janus探针的旋转动力学独立于自推进力。用粘性聚合物代替排斥性聚合物时,Janus探针的平移和旋转均方位移显示出急剧下降。由于Janus粒子的不同面与环境的相互作用不同,我们表明,自推进的方向也影响其动力。相对于拥挤器的面积分数绘制的,具有固定自推进力的自推进式探头的长期平移和旋转扩散率的比值经过最小值,并且在不存在约束力的情况下,较高的面积分数合并为其值拥挤者。这指向在推挤器的中间区域部分处的自推进探针的平移和旋转动力学的解耦。但是,无源探头不存在这种平移-旋转解耦。在没有拥挤者的情况下,通过最小值并在较高面积处合并到其值。这指向在推挤器的中间区域部分处自推进探针的平移和旋转动力学的解耦。但是,无源探头不存在这种平移-旋转解耦。在没有拥挤者的情况下,通过最小值并在较高面积处合并到其值。这指向在推挤器的中间区域部分处自推进探针的平移和旋转动力学的解耦。但是,无源探头不存在这种平移-旋转解耦。
更新日期:2020-09-23
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