Microscopic Approach to the Nonlinear Elasticity of Compressed Emulsions

被引:59
作者
Jorjadze, Ivane [1 ]
Pontani, Lea-Laetitia [1 ]
Brujic, Jasna [1 ]
机构
[1] NYU, Dept Phys, Ctr Soft Matter Res, New York, NY 10003 USA
基金
美国国家科学基金会;
关键词
PHASE-DIAGRAM; MODEL; PACKING; MECHANICS;
D O I
10.1103/PhysRevLett.110.048302
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Using confocal microscopy, we measure the packing geometry and interdroplet forces as a function of the osmotic pressure in a 3D emulsion system. We assume a harmonic interaction potential over a wide range of volume fractions and attribute the observed nonlinear elastic response of the pressure with density to the first corrections to the scaling laws of the microstructure away from the critical point. The bulk modulus depends on the excess contacts created under compression, which leads to the correction exponent alpha = 1.5. Microscopically, the nonlinearities manifest themselves as a narrowing of the distribution of the pressure per particle as a function of the global pressure. DOI: 10.1103/PhysRevLett.110.048302
引用
收藏
页数:5
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