自扩散电泳Janus马达集体动力学的趋化和流体动力学效应
Chemotactic and hydrodynamic effects on collective dynamics of self-diffusiophoretic Janus motors
摘要：
由化学反应驱动的自推进Janus马达的非平衡稳态悬浮液中的集体运动可以由于来自直接分子间力、流体动力学流动效应或化学梯度介导的趋化效应的相互作用而产生。这些相互作用的相对重要性取决于电机的反应特性、系统保持稳定状态的方式以及悬浮液的性质，例如体积分数。从模拟的微观硬碰撞模型的流体粒子与Janus电机的相互作用，我们表明，动态集群状态的存在，并确定的相互作用机制，负责其形成。趋化和流体动力学效应的相对重要性是通过考虑一个微观模型，其中趋化效应被关闭，而保留完整的流体动力学相互作用。该系统通过本体反应维持在稳定状态，在该本体反应中，产物颗粒再转化成燃料颗粒。研究了本体反应速率对集体动力学的影响。
英文摘要：
Collective motion in nonequilibrium steady state suspensions of self-propelled Janus motors driven by chemical reactions can arise due to interactions coming from direct intermolecular forces, hydrodynamic flow effects, or chemotactic effects mediated by chemical gradients. The relative importance of these interactions depends on the reactive characteristics of the motors, the way in which the system is maintained in a steady state, and properties of the suspension, such as the volume fraction. From simulations of a microscopic hard collision model for the interaction of fluid particles with the Janus motor we show that dynamic cluster states exist and determine the interaction mechanisms that are responsible for their formation. The relative importance of chemotactic and hydrodynamic effects is identified by considering a microscopic model in which chemotactic effects are turned off while the full hydrodynamic interactions are retained. The system is maintained in a steady state by means of a bulk reaction in which product particles are reconverted into fuel particles. The influence of the bulk reaction rate on the collective dynamics is also studied.
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