D. Quemada

Energy of interaction in colloids and its implications in rheological modeling.

This work deals with the problem of deriving theoretical connections between rheology and interparticle forces in colloidal suspensions. The nature of interparticle forces determines the colloidal structure (crystalline order due to long range repulsive forces, flocculation due to attractive forces, etc.) and hence, the flow behavior of suspensions. The aim of this article is to discuss how these interactions enter the modeling of rheometric functions, in particular, the shear viscosity. In this sense, the main interactions commonly appearing in colloids are reviewed, as well as the role they play in phase transition behavior. Then, a series of approaches relating the interaction potential to viscosity is examined. The results of applying these models to experimental data are also discussed. Finally, examples of viscosity modeling for different interaction potentials are given, by using the structural model proposed previously by the authors. The possibility of relating the flow behavior of colloidal suspensions to the interaction between particles offers new perspectives for the study and technical applications of these systems.

Rheology of concentrated disperse systems II. A model for non-newtonian shear viscosity in steady flows

SummaryA relative viscosity — volume concentration relationship,ηr =ηr(φ) deduced from an energy principle, which operates in newtonian range, is phenomenologically extended to the description of non-newtonian behaviour. Such an extension is performed, using a structural intrinsic viscosity

Modelling the viscosity of depletion flocculated emulsions

\tilde k

Studies of rheological behavior of colloidal silica suspensions with interaction potential

, which depends on volume concentrationφ and shear rate

Extracorporeal cephalic blood autoperfusion method in the rat. Hemorrheological evaluation and proposed pharmacological uses.

\dot \gamma

A Two-Fluid Model for Highly Concentrated Suspension Flow Through Narrow Tubes and Slits: Velocity Profiles, Apparent Fluidity and Wall Layer Thickness

. At constant