演讲人：马晓光

题  目：Micro-structure and mechanics in colloidal suspensions and assemblies

时  间：2019年4月22日星期一 上午10:00

地  点：哈工大（深圳）A507

讲座介绍：

Complex fluids (or soft matters) can hold their shapes _like solids; they can also yield to external stress and flow _like liquids. Unlike simple liquids or solids, however, there is no fundamental overarching theory that explains the mechanical properties of complex fluids. In this talk, I’ll present our recent efforts that explore the structure-mechanics connections in colloidal complex fluids. Specifically, I’ll first explain the concept of “excess” entropy and how we use this structural information to understand particle diffusion and viscous drag in dense colloidal suspensions. Then I’ll discuss the idea of “softness” based on a machine-learning approach. In our experiment with colloidal glasses, softness successfully predicted particle rearrangements that could ultimately lead to mechanical failures.

个人简介：

    马晓光，中山大学物理系本科，材料物理与化学专业硕士。香港科技大学物理系博士。2015年起至今，在美国宾夕法尼亚大学物质结构实验室从事研究工作，兼任索尔维软物质复杂组装研究中心研究员（Solvay-LRSM Fellow）。主要研究胶体软物质系统的自组装结构与动力学问题。已在Phys. Rev. Lett.，Science等国际学术刊物上发表论文10余篇。担任Phys. Rev. Lett.，Phys. Rev. E， J. Chem. Phys.和Soft Matter审稿人。

 1) X.-G. Ma, et. al, "Test of the universal scaling law of diffusion in colloidal monolayers," Phys. Rev. Lett. 110, 078302 (2013).

 2) X. G. Ma, et. al, "Heterogeneous activation, local structure and softness in supercooled colloidal liquids," Phys. Rev. Lett. 122, 028001 (2019) [Editors’ Suggestion].