Rheological Behavior of Microemulsions

Details Rheological Behavior of Microemulsions Rheological Behavior of Microemulsions

2002-10-14

arxiv.org/abs/cond-mat/0210300v1

Physical Review E 66, 031506 (2002)

Physics

Condensed Matter

Soft Condensed Matter

10 figures, 2 of which have format jpg

Scientific paper

10.1103/PhysRevE.66.031506

We study the stationary and transient behaviors of the microemulsion phase subjected to a shear flow. The system is described by a diffusion-convective equation which generalizes the usual Cahn-Hilliard equation. Non-linear terms are treated in a self-consistent approximation. Shear, first and second normal stresses are calculated as momenta of the structure factor. Shear thinning is observed in stationary conditions. After a newtonian regime at small values of the shear rate, the excess viscosity decreases when the shear rate becomes of the order of the inverse of the relaxation time of the system without flow. In transient regimes, when the flow is applied starting from a quiescent state, we find that the shear stress reaches a maximum before decreasing to a constant value.

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