Scaling of the viscoelasticity of weakly attractive particles


Trappe, V. ; Weitz, D. A. Scaling of the viscoelasticity of weakly attractive particles. Physical Review Letters 2000, 85, 449-452. Copy at
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The rheological data of weakly attractive colloidal particles are shown to exhibit a surprising scaling behavior as the particle volume fraction, phi, or the strength of the attractive interparticle interaction, U, are varied. There is a critical onset of a solid network as either phi or U increase above critical values. For all solidlike samples, both the frequency-dependent linear viscoelastic moduli, and the strain-rate dependent stress can be scaled onto universal master curves. A model of a solid network interspersed in a background fluid qualitatively accounts for this behavior.


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Last updated on 03/20/2014