Séminaire PMMH - Luca Cipelletti (Univ. Montpellier)

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8 avril 11:00 » 12:00 — Salle réunion PMMH 1

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).





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