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Gradient dynamics models for films of complex fluids and beyond – dewetting, line deposition and bacterial carpets

November 15 / 10:30 am - 11:30 am

Uwe Thiele
Institut für Theoretische Physik, Universität Münster

After a brief review of a number of experiments on dewetting and
evaporating thin films/drops of simple and complex liquids including
suspensions and solutions I introduce the concept of a gradient
dynamics description of the evolution of interface-dominated films and
drops on solid substrates.  Such a formulation is first given for
films/drops of simple non-volatile liquid, and illustrated with
results on droplet patterns and sliding droplets.  I also reformulate
the diffusion equation as a gradient dynamics and combine the obtained
elements in a thermodynamically consistent gradient dynamics
formulation for films of mixtures and surfactant suspensions.

Next such models are employed to investigate the out-of-equilibrium
process of the deposition of line patterns at receding contact lines
for evaporatively dewetting solutions/suspensions and in Langmuir
Blodgett transfer. For the latter I analyse the underlying bifurcation
structure in some detail. Finally, I introduce a model that couples
thin film dynamics with the active collective motion of free
surface-bound swimmers and illustrate the occuring structure
formation.  I conclude with a summary and outlook.

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November 15
10:30 am - 11:30 am


Sala de reuniones del laboratorio de materia fuera del equilibrio DFI
Avenida Almirante Beauchef 850
santiago, Chile
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