自驱动物质中由边界和筛选诱导的气泡相
Boundary- and Screening-Induced Bubbly Phases in Autophoretic Active Matter
- Indian Institute of Technology Madras（印度马德拉斯理工学院）
- Princeton University（普林斯顿大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究探究了自驱动活性粒子的集体动力学，发现由边界和筛选诱导的新型气泡相，绘制了不同边界条件下的相图，为微流控中活性组装与输运提供了设计规则。
AI中文摘要：
空间限域与化学筛选从根本上改变了自泳活性粒子的非平衡相行为。本研究系统探究了由化学吸引平移力（μ_t < 0）和化学排斥旋转力矩（μ_r > 0）主导的自驱动粒子的集体动力学，涵盖不同筛选参数κ、力矩大小μ_r及边界条件系数Λ^c的变化情况。除常规的趋化性宏观相分离与动态聚簇外，本研究还报道了新型的、由边界和筛选诱导的气泡相，可分为沸腾气泡与爆裂气泡两类。通过稳态聚簇分数〈S〉、时间波动幅度σ_S和配位数〈Q〉这一三元度量，绘制了无通量边界（Λ^c = 1）和化学可渗透界面（Λ^c = 0）的相图以划分各相。化学筛选（κ）的增强会系统性抑制长程吸引力，驱动从宏观坍缩到气泡态、动态微聚簇再到均匀气相的连续相变，同时诱导聚集体形状各向异性。这些发现为微流控环境中活性组装与输运的控制提供了可预测的设计规则。
英文摘要：
Spatial confinement and chemical screening fundamentally reshape the non-equilibrium phase behavior of autophoretic active particles. Here, we present a systematic study mapping the collective dynamics of self-propelled particles governed by chemo-attractive translational forces ($μ_t < 0$) and chemo-repulsive rotational torques ($μ_r > 0$) across varying screening parameters $κ$, torque magnitudes $μ_r$, and boundary condition coefficients $Λ^c$. Beyond standard chemotactic macro-phase separation and dynamic clustering, we report the emergence of novel boundary- and screening-induced bubbly phases, classified into boiling and bursting bubbles. Using a metric triad of steady-state cluster fraction $\langle S \rangle$, temporal fluctuation magnitude $σ_S$, and coordination number $\langle Q \rangle$, we draw phase diagrams to demarcate phases for no-flux boundaries ($Λ^c = 1$) and chemically permeable interfaces ($Λ^c = 0$) . Increasing chemical screening ($κ$) systematically suppresses long-range attraction, driving sequential phase transitions from macro-scale collapse toward bubbly states, dynamic micro-clusters, and homogeneous gas phases, while simultaneously inducing aggregate shape anisotropy. These findings provide predictive design rules for controlling active assembly and transport in microfluidic environments.
