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We report a numerical investigation of the visco-elastic behavior in modelsfor steric repulsive and short-range attractive colloidal suspensions, alongdifferent paths in the attraction-strength vs packing fraction plane. Morespecifically, we study the behavior of the viscosity (and its frequencydependence) on approaching the repulsive glass, the attractive glass and in there-entrant region where viscosity shows a non monotonic behavior on increasingattraction strength. On approaching the glass lines, the increase of theviscosity is consistent with a power-law divergence with the same exponent andcritical packing fraction previously obtained for the divergence of the densityfluctuations. Based on mode-coupling calculations, we associate the increase ofthe viscosity with specific contributions from different length scales. We alsoshow that the results are independent on the microscopic dynamics by comparingnewtonian and brownian simulations for the same model. Finally we evaluate theStokes-Einstein relation approaching both glass transitions, finding a clearbreakdown which is particularly strong for the case of the attractive glass.

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