Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique
UMR 5623

Active matter

Controlling the shape, the deformation or even the motility of a chemical system is the main goal of this research axis. Such a control is obtained by adjusting an experimental parameter such as the concentration of chemical species, the temperature or a magnetic field. Biocompatible gels are also designed for cell oriented growth or microscopy applications.
Two examples of this research are described below:

Rational hydrogel formulation leads to reversible and enhanced photocontrolled rigidity

Biocompatible hydrogels exhibiting a reversible photocontrollable stiffness have been obtained. Their Young’modulus varies over an unprecedented value of 30% following UV-visible irradiation cycles. Moreover, their initial mechanical properties can be predicted following Design of Experiment process.

Rational hydrogel formulation leads to reversible and enhanced photocontrolled rigidity
ChemPhotoChem, 2017, 1, 311-316
Royes-Mir J. ; Coudret C. ; Roux C. ; Benoit-Marquié F. ; Cazalès C. ; Séverac C. ; Lorenzo C. ; Mingotaud A.-F.
 

Metamorphosis of a droplet on a surfactant solution

CTAB concentration is the control parameter of a succession of highly ordered patterns recorded when a dichloromethane drop is placed on an aqueous solution.

--> click on each image for looking at the video

           © David Villa / Science Images CNRS

            0.25                                 0.5                                      10                                     30
                                                                     [CTAB]  / mM
 

Adding surfactant to the drop phase induces a pulsating regime showing a flower-like pattern during the receding stage.


--> click on the image for looking at the video

Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate
Nat. Commun., 2018, 9, 820
Wodlei F. ; Sebilleau J. ; Magnaudet J. ; Pimienta V.

2018 IMRCP