Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses.

Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses. Research Abstract Details 

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Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses. Abstract Text:

Antonio M Puertas,Cristiano De Michele,Francesco Sciortino,Piero Tartaglia,Emanuela Zaccarelli,Antonio M Puertas,Cristiano De Michele,Francesco Sciortino,Piero Tartaglia,Emanuela Zaccarelli,

We report a numerical investigation of the viscoelastic behavior in models for steric repulsive and short-ranged attractive colloidal suspensions, along different paths in the attraction strength vs packing fraction plane. More specifically, we study the behavior of the viscosity (and its frequency dependence) on approaching the repulsive glass, the attractive glass, and in the reentrant region where viscosity shows a nonmonotonic behavior on increasing attraction strength. On approaching the glass lines, the increase of the viscosity is consistent with a power-law divergence with the same exponent and critical packing fraction previously obtained for the divergence of the density fluctuations. Based on mode-coupling calculations, we associate the increase of the viscosity with specific contributions from different length scales. We also show that the results are independent of the microscopic dynamics by comparing Newtonian and Brownian simulations for the same model. Finally, we evaluate the Stokes-Einstein relation approaching both glass transitions, finding a clear breakdown which is particularly strong for the case of the attractive glass.

Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses. Publishing Authors By Initials

AM Puertas,C De Michele,F Sciortino,P Tartaglia,E Zaccarelli,AM Puertas,C De Michele,F Sciortino,P Tartaglia,E Zaccarelli,

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Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of chemical physics

VOLUME: 127

Page Numbers: 144906

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ISSN: 0021-9606

DAY: 14

MONTH: Oct

YEAR: 2007

Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses. Information

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LANGUAGE: eng

NlmUniqueID: 375360

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Grant and Affiliation Information for Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses.

AFFILIATION: Group of Complex Fluid Physics, Departamento de Física Aplicada, Universidad de Almería, 04120 Almeria, Andalucía, Spain.

Country: United States

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MEDLINETA: J Chem Phys

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