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Monday, March 25

Structural Heterogeneities in Molecular Liquids by
Self-Association or Solvation in Binary Mixtures

Christiane Alba-Simionesco, Laboratoire Léon Brillouin, Sacley, France
Joint Institute for Neutron Sciences Seminar
11:00 AM — 12:00 PM, Joint Institute for Neutron Sciences (Building 8630), Room A-202
Contact: Hope Moore-Webb (hmoore2@utk.edu), 865.576.8630

Abstract

We focus in the present work on the interplay between structure and dynamics in glassforming liquids: while what causes the viscous slowing down of molecular liquids can be related to an increase of a dynamical correlation length as four point correlation functions define it, its structural counterpart, a static correlation length extracted from the pair correlation function g(r), is never observed or hardly defined by various models. We propose to take an alternative way by studying hydrogen-bonded liquids that spontaneously form supermolecular clusters and their consequences on the dynamical properties in the supercooled liquid state. The effect of temperature when the system is cooled, but also the solvation effects in aprotic solvent or water binary mixtures on the self-association and segregation processes will be presented after performing elastic and quasielastic neutron scattering experiments combined with Raman and dielectric spectroscopies.