Séminaire Café (Interne)
Il s’agit d’un exposé assez court (20 min) et assez informel.
Prière aux conférencier·ère·s de ne jamais dépasser 30 min et de vérifier la compatibilité avec le projecteur avant le séminaire.
Les séminaires ont lieu les jeudis après la réunion du laboratoire qui débute à 13h30 dans la bibliothèque du labo sur le campus Jussieu, Barre Cassan, Bât A, 1er étage.
Pour suggérer un titre et envoyer un abstract, contacter Antoine Bouvier <> et Jeanne Moscatelli <> .
Coffee seminars are supposed to be short and informal presentations (20 min).
Please never last longer than 30 min and check the compatibility of the projector with your computer before the seminar.
Location : Campus Jussieu, Barre Cassan, Bât A, 1er étage
7 quai Saint Bernard
75005 Paris
To suggest a title or send an abstract, please contact Antoine Bouvier <> and Jeanne Moscatelli <> ..
25 avril | Krishan Bumma PhD student at Institut d’Alembert Freezing (almost) destroys soap-water foams. The solidification of disordered complex media is a challenging problem that appears in a wide range natural and industrial applications (sea ice, ground freezing, cryopreservation, food industry...). Foams are a type of complex material of particular interest for it’s industrial uses. However solidifying a foam poses distinct challenges due to the presence of gaz bubbles in the solidifying metastable fluid matrix. By placing a model aqueous foam in contact with a cold surface, we observe that, as it freezes, the foam undergoes a drastic change in volume revealing important liquid and gas migration in the foam. We quantify the liquid and the gaz flows as the foam solidifies and show that they follow non-trivial scaling laws. |
2 mai | Friedrich Walzel PhD student at Institut Charles Sadron (Strasbourg university) Adhesive bubbles and drops between circular frames : Shape, force and stability analysis We exploit the theory of axisymmetric constant mean curvature surfaces (Delauney surfaces [1]) to describe the mechanical interactions between drops, bubbles or capillary bridges [2,3] held by circular frames with radius R and distance 2h (see figure). We complement the theory with experimental and computational approaches (Surface Evolver [4]). The figure shows our obtained shape diagram, which indicates under which constraints the bubbles remain axisymmetric and in contact. Due to four different instabilities, the bubbles lose contact or lose their axisymmetry. Two of these four instabilities (2 and 3) have been discovered by us. Different contact angles between the bubbles θ are due to different adhesive forces between the bubbles. The shape diagrams of the two limiting cases with θ=0° and θ=180° have been obtained additionally to the case of θ=60° (see Fig.). Using these diagrams and theory, the stability and mechanical properties of capillary bridges or bubbles in contact under tension or compression can be predicted [5]. The provided analysis holds equally for bubbles, drops or capillary bridges and gives an approach to investigate more complex interfaces with for example elastic skins. |
9 mai | No coffee seminar (holiday) |
16 mai | Haim Diamant |
23 mai | Kevin Matías Simpson Alfaro Post-doctorant at Pontificia Universidad Católica de Chile |
30 mai | Corentin Bisot PhD student at AMOLF, Amsterdam |