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  • Title: The shear viscosity of polyampholyte (gelatin) stabilized colloidal dispersions.
    Author: Krishnamurthy LN, Weigert EC, Wagner NJ, Boris DC.
    Journal: J Colloid Interface Sci; 2004 Dec 01; 280(1):264-75. PubMed ID: 15476798.
    Abstract:
    A micromechanical model for the zero shear viscosity of polyampholyte-stabilized colloidal dispersions based on the osmotic overlap potential is proposed and tested against model system measurements. This model relates the shear viscosity of polyampholyte-stabilized colloidal dispersions to the oncotic pressure of polyampholyte solutions through an interparticle potential and an effective hard-sphere scaling. The results of viscosity calculations based on independently measured parameters compare favorably to experimental measurements on model, silica dispersions stabilized with adsorbed photographic grade gelatin. The results support a direct link between the capacity of polyampholytes and polyelectrolytes to stabilize dispersions and control dispersion viscosity and their solution oncotic pressure. The model is also demonstrated to provide a master curve for literature data for the zero shear viscosity of polyampholyte stabilized colloidal dispersions.
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