Abstract
We report the shear viscosity measurements carried out in a dilute collidal solution of monodisperse polystyrene particles as a function of the volume fraction of the dispersed phase and for different particles sizes in a completely deionized water suspension and in the presence of a small amount of salt (NaCl). The results are analyzed in the frame of a recent simple model, based on the theory of interaction between electrical double layers, that relates the rheological properties of the system to the interparticle potential. The comparison between the calculated high-frequency shear modulus and the viscosity data show better agreement. Therefore we can confirm the idea that in such systems the rheological behavior can be completely explained in terms of the interparticle potential energy of interaction.
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