Séminaire

Vendredi 5 Mars 2021 à 11h00.

Multi-scale APproach for a microscopic underStanding of thermal transport in nanocomposites (MAPS)

''Nanophononic materials and nanocomposites are today at the forefront of material research and hold great potential for many technological applications, especially when thermal management represents a major challenge. Indeed, thermal transport can be greatly enhanced or reduced by acting on the parameters of the nanostructure, with almost no effects on other functional properties. As such, nanostructured materials are most promising in energy harvesting applications, such as thermoelectricity, and for solving the ubiquitous thermal management problem. Yet, their enormous potential still lies unused due to the poor understanding of the microscopic mechanisms ruling thermal transport in heterogeneous systems. Indeed, the many studies of the thermal conductivity, a collective phonon property, remain unable to give insight on what happens to single phonons. In this talk, I will shortly present our project, MAPS, which aims to get such understanding by means of an unprecedented multi-scale experimental and theoretical approach, for directly looking at the effect of nanoscale heterogeneities on individual phonons with wavelengths going from micrometer to sub-nanometer.''