Elasticity of soft particles and colloids near Random Close Packing

Details Elasticity of soft particles and colloids near Random Close Packing Elasticity of soft particles and colloids near Random Close Packing

2008-06-28

arxiv.org/abs/0806.4653v2

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 2 figures

Scientific paper

Assemblies of purely repulsive and frictionless particles, such as emulsions or hard spheres, display very curious properties near their jamming transition, which occurs at the random close packing for mono-disperse spheres. Although such systems do not contain the long and cross-linked polymeric chains characterizing a rubber, they behave macroscopically in a similar way: the shear modulus $G$ can become infinitely smaller than the bulk modulus $B$. After reviewing recent theoretical results on the structure of such packing (in particular their coordination) I will propose an explanation for the observed scaling of the elastic moduli, and explain why the arguments both apply to soft and hard particles.

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