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When: 27 October, 11:00–12:00 CET

Where: Via Zoom

Speaker: Dr. Marie Plazanet, Université Grenoble Alpes - CNRS and Fédération

Title: "Dynamics in soft matter: What we learn from quasi-elastic neutron scattering"

Organisers: Frank Schreiber (KFN chair), Karin Griewatsch (KFN PR)

Abstract:

In this seminar, Marie Plazanet will survey what quasi-elastic neutron scattering brings to soft matter, considering the systems complexity, multi scale phenomena and use of other techniques. The importance of coupled techniques will be highlighted. She will then present the particular case of the ternary solution of ethanol, water and octanol.

Ternary mixtures present complex phase diagrams, rich of regions with different organization (homogeneous, micellar, bicontinuous, ...

biphasic) and macroscopic properties (solubility, viscosity...). In order to fully understand such kind of systems, the study of the mixtures at the microscopic scale is necessary. This solution has been very well studied from a structural point of view because it exhibits the Ouzo effet, as well as a pre-Ouzo region. Marie Plazanet will detail the dynamics of this system, model for self-organization in hydrogen-bonded mixtures with hydrotrope. Complementary measurements of quasi-elastic neutron scattering and PFG-NMR on specifically deuterated components indeed provide a full description of the molecular dynamics of each component of the system, from diffusion coefficients to life-time of the droplets in the pre-Ouzo regime. It is possible to identifiy the subtle signature of the nanoscale structural organization in the dynamics.