报告人：朱来来（新加坡国立大学）
报告时间：2024年5月13日（周一）10:00-11:00
报告地点：精正楼409
报告摘要：
Phoretic microswimmers, such as Janus colloids and isotropic active droplets, are promising constituents for self-organized active materials. However, the underlying mechanisms governing their self-organization remain unclear, despite numerous experimental observations in various regimes. Here, we perform large-scale simulations to investigate a paradigmatic suspension of isotropic phoretic disks representing active droplets, explicitly resolving their many-body, long-range hydrochemical interactions. We observe that they exhibit diverse collective phenomena, including the formation of crystalline solids resembling Wigner crystals, melting, gas-like chain formation, active transition and turbulence. Our work reproduces and reconciles seemingly conflicting experimental observations on chemically active systems, emphasizing the importance of incorporating full physicochemical hydrodynamics. Remarkably, altering activity alone induces solid-fluid phase transition and, subsequently, the laminar-turbulent transition of the fluid. These two progressively emerging transitions, hitherto unreported, bring us closer to perceiving the parallels between active matter and traditional matter. Our findings will help enhance the understanding of long-range, many-body interactions among phoretic agents, offer new insights into non-equilibrium collective behaviors, and provide potential guidelines for designing reconfigurable materials.
报告人简介：
朱来来，新加坡国立大学助理教授。2014年于瑞典皇家理工学院获得博士学位。2014-2016在瑞士洛桑联邦理工学院担任博士后。2016-2020在普林斯顿大学Howard A. Stone教授组担任博士后。2020年至今，于新加坡国立大学担任助理教授。主要从事生物物理学、仿生设计和微尺度流动方面的理论与数值研究。当前的研究方向也包括活性物质和智能流体。
邀请人：王义乾