Elasticity of arrested short-ranged attractive colloids: homogeneous and heterogeneous glasses

Details Elasticity of arrested short-ranged attractive colloids: homogeneous and heterogeneous glasses Elasticity of arrested short-ranged attractive colloids: homogeneous and heterogeneous glasses

2009-01-29

arxiv.org/abs/0901.4713v2

Physics

Condensed Matter

Soft Condensed Matter

3 figures, revised version, to appear in Physical Review Letters

Scientific paper

We evaluate the elasticity of arrested short-ranged attractive colloids by combining an analytically solvable elastic model with a hierarchical arrest scheme into a new approach, which allows to discriminate the microscopic (primary particle-level) from the mesoscopic (cluster-level) contribution to the macroscopic shear modulus. The results quantitatively predict experimental data in a wide range of volume fractions and indicate in which cases the relevant contribution is due to mesoscopic structures. On this basis we propose that different arrested states of short-ranged attractive colloids can be meaningfully distinguished as homogeneous or heterogeneous colloidal glasses in terms of the length-scale which controls their elastic behavior.

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