手性活性布朗粒子驱动的可变形囊泡输运
Transport of Deformable Vesicles Driven by Chiral Active Brownian Particles
- Indian Institute of Science Education and Research Mohali（印度科学教育与研究学院穆哈利分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过数值模拟和解析理论，揭示了手性活性粒子填充的可变形囊泡中，手性驱动旋转且存在最优手性，并建立了普适标度关系。
AI中文摘要：
活性物质系统能够产生使其周围环境变形的机械应力，从而提供了一条远离平衡态的输运和形状动力学途径。含有活性粒子的可变形囊泡提供了一个最小化的设置，在这种设置中，活性应力直接与边界力学耦合。在这里，我们使用数值模拟研究了一个二维、固定面积的囊泡，其中填充了通过排除体积和极性对齐相互作用的手性活性粒子。我们发现，粒子手性与囊泡变形之间的耦合产生了不同的集体运动模式，包括类似跑停的迁移、转子样动力学和持续旋转。最值得注意的是，我们表明囊泡旋转对手性是非单调的：在固定活性下，存在一个最优手性使旋转速度最大化。我们发展了一个解析理论，将囊泡旋转与手性活性粒子产生的有效扭矩联系起来。该理论识别了最优手性背后的竞争机制，并预测了旋转速度对活性和手性的尺度不变依赖关系。这种标度关系将不同活性强度下获得的模拟结果折叠到一条通用曲线上。我们的结果建立了一种通用机制，通过该机制，手性和集体对齐调节活性应力向可变形边界的传递，为理解受限活性系统中的输运和旋转动力学提供了一个框架。
英文摘要：
Active matter systems can generate mechanical stresses that deform their surroundings, providing a route to transport and shape dynamics far from equilibrium. Deformable vesicles containing active particles offer a minimal setting in which such active stresses are directly coupled to boundary mechanics. Here, we use numerical simulations to investigate a two-dimensional, fixed-area vesicle filled with chiral active particles interacting through excluded volume and polar alignment. We find that the coupling between particle chirality and vesicle deformation produces distinct modes of collective motion, including run-and-tumble-like migration, rotor-like dynamics, and persistent spinning. Most notably, we show that vesicle rotation is non-monotonic in chirality: at fixed activity, an optimal chirality maximizes the rotational velocity. We develop an analytical theory that relates the vesicle rotation to the effective torque generated by the chiral active particles. The theory identifies the competition underlying the optimal chirality and predicts a scale-invariant dependence of the rotational velocity on activity and chirality. This scaling collapses simulation results obtained over different activity strengths onto a universal curve. Our results establish a general mechanism by which chirality and collective alignment regulate the transmission of active stresses to deformable boundaries, providing a framework for understanding transport and rotational dynamics in confined active systems.
