Transport coefficients and mechanical response in hard-disk colloidal suspensions

被引：0

作者：

张博凯 ^{[1
]}

李健 ^{[2
]}

陈康 ^{[3
]}

田文得 ^{[3
]}

马余强 ^{[1
,3
]}

机构：

[1] National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University

[2] Department of Physics, Nanjing Normal University

[3] Center for Soft Condensed Matter Physics & Interdisciplinary Research, College of Physics,Optoelectronics and Energy, Soochow University

来源：

Chinese Physics B | 2016年 / 25卷 / 11期

关键词：

soft matter; colloidal suspensions; glass transition; rheology;

D O I：

暂无

中图分类号：

O37 [流变学];

学科分类号：

080103 ;

摘要：

We investigate the transport properties and mechanical response of glassy hard disks using nonlinear Langevin equation theory.We derive expressions for the elastic shear modulus and viscosity in two dimensions on the basis of thermalactivated barrier-hopping dynamics and mechanically accelerated motion.Dense hard disks exhibit phenomena such as softening elasticity,shear-thinning of viscosity,and yielding upon deformation,which are qualitatively similar to dense hard-sphere colloidal suspensions in three dimensions.These phenomena can be ascribed to stress-induced "landscape tilting".Quantitative comparisons of these phenomena between hard disks and hard spheres are presented.Interestingly,we find that the density dependence of yield stress in hard disks is much more significant than in hard spheres.Our work provides a foundation for further generalizing the nonlinear Langevin equation theory to address slow dynamics and rheological behavior in binary or polydisperse mixtures of hard or soft disks.

引用

页码：111 / 117

页数：7