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Séminaire de Marine Thiebaud

Some nonlinear effects in soft matter.

Some nonlinear effects in soft matter.

Marine Thiebaud

LIPhy, UMR 5588, Grenoble.

I am going to present my PhD Work about nonequilibrium properties of low surface tension interfaces.
This analytical[1] and numerical work is based on experimental study on colloidal fluid interfaces, made by Derks et al[2].
I will focus on the last part of my work about moderate and large shear rates.
A numerical study shows similarites between Burgers phenomenology and the studied model which made the model a promising object of study.
Then, I am going to introduce some results about the bidimensionnal rheological properties of vesicle suspension at fixed concentration : the object of my post-doc work.
After a few words on the numerical method[3], I am going to show the relationship between vesicle organisation and apparent viscosity.

[1] M. Thiébaud and T. Bickel, Nonequilibrium fluctuations of an interface under shear, Phys. Rev. E 81, 031602 (2010)

[2] D. Derks, D. G. A. L. Aarts, D. Bonn, H. N. W. Lekkerkerker, and A. Imhof, Suppression of Thermally Excited Capillary Waves by Shear Flow, Phys. Rev. Lett. 97, 038301 (2006)

[3] M. Thiébaud and C. Misbah, Rheology of a vesicle suspension with finite concentration : A numerical study, Phys. Rev. E 88, 062707 (2013)