We evaluate the elasticity of arrested short-ranged attractive colloids by combining an analytically solvable elastic model with a hierarchical arrest scheme. This new approach allows us 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.
Elasticity of Arrested Short-Ranged Attractive Colloids : Homogeneous and Heterogeneous Glasses / A. Zaccone, H. Wu, E. Del Gado. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 103:20(2009), pp. 208301.1-208301.4.
Elasticity of Arrested Short-Ranged Attractive Colloids : Homogeneous and Heterogeneous Glasses
A. Zaccone
;
2009
Abstract
We evaluate the elasticity of arrested short-ranged attractive colloids by combining an analytically solvable elastic model with a hierarchical arrest scheme. This new approach allows us 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.File | Dimensione | Formato | |
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