Phonon dispersion and elastic moduli of two-dimensional disordered colloidal packings of soft particles with frictional interactions

被引：23
|
作者：
Still, Tim [1 ,2 ]
Goodrich, Carl P. [1 ]
Chen, Ke [3 ,4 ]
Yunker, Peter J. [1 ,5 ]
Schoenholz, Samuel [1 ]
Liu, Andrea J. [1 ]
Yodh, A. G. [1 ]
机构：
[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[2] CNRS Rhodia UPenn UMI 3254, Bristol, PA 19007 USA
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[4] Chinese Acad Sci, Key Lab Soft Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[5] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
来源：
PHYSICAL REVIEW E | 2014年 / 89卷 / 01期
基金：
美国国家科学基金会;
关键词：
JAMMING TRANSITION; ZERO-TEMPERATURE; RHEOLOGY; SOLIDS; MODES;
D O I：
10.1103/PhysRevE.89.012301
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Particle tracking and displacement covariance matrix techniques are employed to investigate the phonon dispersion relations of two-dimensional colloidal glasses composed of soft, thermoresponsive microgel particles whose temperature-sensitive size permits in situ variation of particle packing fraction. Bulk, B, and shear, G, moduli of the colloidal glasses are extracted from the dispersion relations as a function of packing fraction, and variation of the ratio G/B with packing fraction is found to agree quantitatively with predictions for jammed packings of frictional soft particles. In addition, G and B individually agree with numerical predictions for frictional particles. This remarkable level of agreement enabled us to extract an energy scale for the interparticle interaction from the individual elastic constants and to derive an approximate estimate for the interparticle friction coefficient.
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页数：5
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