Memory-induced transition from a persistent random walk to circular motion for achiral microswimmers

Dynamical density functional theory for circle swimmers

The majority of studies on self-propelled particles and microswimmers concentrates on objects that do not feature a deterministic bending of their trajectory. However, perfect axial symmetry is hardly found in reality, and shape-asymmetric active microswimmers tend to show a persistent curvature of their trajectories. Consequently, we here present a particle-scale statistical approach of circle-swimmer suspensions in terms of a dynamical density functional theory. It is based on a minimal microswimmer model and, particularly, includes hydrodynamic interactions between the swimmers. After deriv…

液晶微滴的温度可切换自推进活性

Temperature switchable self-propulsion activity of liquid crystalline microdroplets

本研究利用液晶近晶相液滴的温度依赖性相变，实现了可逆切换的自推进微型游泳器，仅在高温向列或各向同性相中运动，并揭示了其运动条件与机制。

Intermediate scattering function of an anisotropic Brownian circle swimmer

Microswimmers exhibit noisy circular motion due to asymmetric propulsion mechanisms, their chiral body shape, or by hydrodynamic couplings in the vicinity of surfaces. Here, we employ the Brownian circle swimmer model and characterize theoretically the dynamics in terms of the directly measurable intermediate scattering function. We derive the associated Fokker-Planck equation for the conditional probabilities and provide an exact solution in terms of generalizations of the Mathieu functions. Different spatiotemporal regimes are identified reflecting the bare translational diffusion at large w…

耦合自推进机器人中的不对称诱导手性动力学：旋转和圆周运动

Asymmetry-Induced Chiral Dynamics in Coupled Self-Propelled Robots: Spinning and Circular Motion

研究两个由弹簧耦合的自推进活性布朗机器人系统中几何不对称如何产生净扭矩，导致持续旋转运动，并展示三种动力学状态：奔跑-翻滚、圆周轨迹和自旋。

活性固体、囊泡和液滴的变形虫式推进：比较研究

Amoeboid propulsion of active solid bodies, vesicles and droplets: a comparison

本研究统一分析由周期性轴对称非手性形变驱动的可变形固体、囊泡和液滴三种微泳体，通过二阶微扰展开计算其泳动性能并比较，揭示不同泳体在最优冲程和相同冲程下的速度、效率差异及排名规律。

Active Brownian particles moving in a random Lorentz gas

Biological microswimmers often inhabit a porous or crowded environment such as soil. In order to understand how such a complex environment influences their spreading, we numerically study non-interacting active Brownian particles (ABPs) in a two-dimensional random Lorentz gas. Close to the percolation transition in the Lorentz gas, they perform the same subdiffusive motion as ballistic and diffusive particles. However, due to their persistent motion they reach their long-time dynamics faster than passive particles and also show superdiffusive motion at intermediate times. While above the criti…

Universal Trajectories of Motile Particles Driven by Chemical Activity

Locomotion is essential for living cells. It enables bacteria and algae to explore space for food, cancer to spread, and immune system to fight infections. Motile cells display trajectories of intriguing complexity, from regular (e.g. circular, helical, and so on) to irregular motions (run-tumble), the origin of which has remained elusive for over a century. This dynamics versatility is conventionally attributed to the shape asymmetry of the motile entity, to the suspending media, and/or to stochastic regulation. We propose here a universal approach highlighting that these movements are generi…

壁面力矩调控细菌浴中曲率驱动的推进

Wall torque controls curvature-driven propulsion in bacterial baths

该研究探究细菌浴中曲率驱动的推进机制，发现微帆推进速度与曲率线性相关，且壁面力矩通过影响细菌滑动取向产生净推力，揭示了非球形活性粒子与曲面作用的独特规律。

悬浮胶囊在活性凝胶中的自发旋转与推进

Spontaneous rotation and propulsion of suspended capsules in active nematics

研究通过格子玻尔兹曼模拟探讨了弹性胶囊在二维活性凝胶中的动力学行为，揭示了胶囊形状、变形能力和缺陷动态如何协同产生软活性物质的自组织运动。

振荡活性布朗运动：精子动力学的最小模型

Oscillatory Active Brownian Motion: A Minimal Model for Sperm Dynamics

研究针对标准活性布朗运动未考虑精子内在振荡的问题，提出振荡活性布朗运动模型，给出相关可观测量解析表达式及核心预测，利用人类精子轨迹推断参数，能定量再现精子轨迹和动力学，为描述精子运动性提供框架。

多丝协调缓解由惯性诱导的旋转停滞

Multi-filament coordination rescues active transport from inertia-induced spinning arrest

研究通过多丝协调机制克服惯性诱导的运动停滞，发现通过立体约束消除螺旋构象，恢复定向运输，揭示了机械驱动的运动增强机制。