THE VISCOSITY OF A MODERATELY DENSE SUSPENSION OF PARTICLES WITH PIECE-WISE CONSTANT POTENTIALS OF INTERACTION

A recently developed formalism is used to construct an expression for the viscosity second virial coefficient (proportional to the Huggins c oefficient) of a monodisperse suspension of spherical colloid particle s with piece-wise constant potentials of interaction. Numerical values are generated for the two special cases of square-well and square-ste p potentials, both with stick boundary conditions at the solute-solven t interface. Also, presented is a demonstration that the so-called ''s ticky-sphere'' model is incapable of representing a suspension of part icles interacting with a square-well potential. (C) 1998 Elsevier Scie nce B.V. All rights reserved.