ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Luca Cipelletti (Univ. Montpellier)
Luca Cipelletti1,2, A. Pommella1, L. Ramos1, D. Larobina3, Y. Nagazi1, A.-M. Philippe1
1L2C UMR 5221 Université de Montpellier and CNRS, Montpellier, France
2Institut Universitaire de France, France
3iPCB, CNR Naples, Italy
I'll describe recent experiments in our group where we couple rheology measurements to space and time-resolved dynamic light scattering, aiming at understanding the relationship between microscopic dynamics and linear and non-linear viscoelastic properties. I'll show that the microscopic dynamics is a very sensitive indicator of the ultimate fate of soft solids, able to detect precursors signs of failure well ahead other microscopic or macroscopic quantities [1,2]. I'll then focus on mucus gels, where an unexpected acceleration of the microscopic dynamics is seen upon applying a very modest shear strain, well within the rheological linear regime [3].
References
[1] Aime, S., Ramos, L. & Cipelletti, L. Microscopic dynamics and failure precursors of a gel under mechanical load. PNAS 115, 3587–3592 (2018).
[2] A. Pommella, L. Cipelletti, L. Ramos, Role of normal stress in the creep dynamics and failure of a biopolymer gel, L., Phys. Rev. Lett. 125, 268006 (2020).
[3] D. Larobina, A. Pommella, A.-M. Philippe, M. Y. Nagazi, and L. Cipelletti, Enhanced Microscopic Dynamics in Mucus Gels under a Mechanical Load in the Linear Viscoelastic Regime, Proc Natl Acad Sci USA 118, e2103995118 (2021).
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
