Soft matter and biophysics
(Polymers, soft matter and biophysics)
Surface tension drives foams, wetting and molecular films. The problems we study include phospholipid mono- and bilayers ; foams at and close to equilibrium ; wetting on disordered surfaces controlled by electrowetting ; and proteins at interfaces.
Four topics are under development:
- (i) determination of structural data of chromatin and chromosome from traction experiments on single objects.
- (ii) Description of robust processes in cellular adhesion.
- (iii) Bacterial individuality (epigenetic) and its role in the precision of the cyrcadien cycle and the quorum sensing;
- (iv) predator-prey interaction and stochastic noise in models ecosystems.
Dynamics of vesicles and membranes:
Vesicles in adhesion on a substrate, forces induced by a hydrodynamic and dynamic flow of desorption.
Interaction between a diffusion field and a phospholipidic membrane.
We design and prepare giant phospholipidic vesicles with mechanical and "of adhesion" properties controlled.
We study dynamics close to a wall (bearing, slip, deformation, force of bearing pressure) of these deformable vesicles under external field (flow, gravity) and, in particular, mechanical and "of adhesion" effects on the behavior of the vesicles under flow.
We study instabilities of shapes of filled up with gel vesicles under osmotic shock.
Presentation film : Vesicules.mpg