论文标题
具有环形限制的极性对齐的活动粒子
Active particles with polar alignment in ring-shaped confinement
论文作者
论文摘要
我们研究了活性，非手性和手性的，具有极性比对和空间相互作用的悬浮液的稳态特性，这些颗粒限制在两个维度的环形（环（环）限制中）。探索在这里最小的水平上掺入极性粒子间比对，几何限制和表面曲率之间的可能相互作用，我们报告了表面群体的反转效应，从而使活性颗粒从网状的外部凹面边界迁移以在其内部凸边界上积聚。这与传统的图片进行了对比，这意味着相对于凸线的凹界，活动粒子在凹边界上的积累更强。种群逆转是由粒子比对和表面曲率引起的，当这些因素中的任何一个中的任何一个都消失。我们探讨了随之而来的对活动颗粒的电流和游泳压力的后果，并分析了系统参数的可能作用，例如颗粒的平均数密度以及粒子自我强化，手性和对齐强度。
We study steady-state properties of a suspension of active, nonchiral and chiral, Brownian particles with polar alignment and steric interactions confined within a ring-shaped (annulus) confinement in two dimensions. Exploring possible interplays between polar interparticle alignment, geometric confinement and the surface curvature, being incorporated here on minimal levels, we report a surface-population reversal effect, whereby active particles migrate from the outer concave boundary of the annulus to accumulate on its inner convex boundary. This contrasts the conventional picture, implying stronger accumulation of active particles on concave boundaries relative to the convex ones. The population reversal is caused by both particle alignment and surface curvature, disappearing when either of these factors is absent. We explore the ensuing consequences for the chirality-induced current and swim pressure of active particles and analyze possible roles of system parameters, such as the mean number density of particles and particle self-propulsion, chirality and alignment strengths.
