VISCOSITY MEASUREMENTS IN DENSE MICROEMULSIONS, EVIDENCE OF AGGREGATION PROCESS

We report measurements of the viscosity in a very packed AOT microemulsion as a function of the volume fraction o at different temperatures. The data are analyzsed considering the system as colloidal. In such terms, we consider two contributions to the viscosity: one is directly connected to the repulsive interaction potential, while the second one to the attractive interactions that contribute indirectly, through the formation of aggregates among the spherical droplets constituent the microemulsion.