Transport coefficients and mechanical response in hard-disk colloidal suspensions

doi:10.1088/1674-1056/25/11/116101

中国物理B ›› 2016, Vol. 25 ›› Issue (11): 116101-116101.doi: 10.1088/1674-1056/25/11/116101

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Transport coefficients and mechanical response in hard-disk colloidal suspensions

Bo-Kai Zhang(张博凯), Jian Li(李健), Kang Chen(陈康), Wen-De Tian(田文得), Yu-Qiang Ma(马余强)

1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
2 Center for Soft Condensed Matter Physics & Interdisciplinary Research, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China;
3 Department of Physics, Nanjing Normal University, Nanjing 210023, China

收稿日期:2016-06-14 修回日期:2016-07-22 出版日期:2016-11-05 发布日期:2016-11-05
通讯作者: Bo-Kai Zhang E-mail:bkzhang@smail.nju.edu.cn
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2012CB821500) and the National Natural Science Foundation of China (Grant Nos. 21374073 and 21574096).

Transport coefficients and mechanical response in hard-disk colloidal suspensions

Bo-Kai Zhang(张博凯)¹, Jian Li(李健)³, Kang Chen(陈康)², Wen-De Tian(田文得)², Yu-Qiang Ma(马余强)^1,2

1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
2 Center for Soft Condensed Matter Physics & Interdisciplinary Research, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China;
3 Department of Physics, Nanjing Normal University, Nanjing 210023, China

Received:2016-06-14 Revised:2016-07-22 Online:2016-11-05 Published:2016-11-05
Contact: Bo-Kai Zhang E-mail:bkzhang@smail.nju.edu.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2012CB821500) and the National Natural Science Foundation of China (Grant Nos. 21374073 and 21574096).

摘要/Abstract

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 thermal-activated 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.

关键词: soft matter, colloidal suspensions, glass transition, rheology

Abstract:

Key words: soft matter, colloidal suspensions, glass transition, rheology

中图分类号: (Glasses)

61.43.Fs

64.70.kj (Glasses) 64.70.pv (Colloids)

张博凯, 李健, 陈康, 田文得, 马余强. Transport coefficients and mechanical response in hard-disk colloidal suspensions[J]. 中国物理B, 2016, 25(11): 116101-116101.

Bo-Kai Zhang(张博凯), Jian Li(李健), Kang Chen(陈康), Wen-De Tian(田文得), Yu-Qiang Ma(马余强). Transport coefficients and mechanical response in hard-disk colloidal suspensions[J]. Chin. Phys. B, 2016, 25(11): 116101-116101.

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Transport coefficients and mechanical response in hard-disk colloidal suspensions

Transport coefficients and mechanical response in hard-disk colloidal suspensions

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