Personal web page : https://www.polytechnique.edu/annuaire/fr/users/marie-claude.clochard
Laboratory link : https://portail.polytechnique.edu/lsi/fr
In the framework of renewable energies, the objective of the PhD proposal is to study innovative piezoelectric systems for electricity supply.
From material point of view, the irradiation coupling of swift heavy ions (GANIL) and e-beam irradiation (SIRIUS) should enhance not only the permittivity of piezo-polymer/metal nanowires but also the elasticity of piezoelectric polymers via structural defaults such as chain scissions induced by e-beam irradiation. The flexibility of the material is a crucial parameter for the efficiency of a piezoelectric generator in order to allow the spontaneous motion of the system structure for weak flow kinetics.
From a mechanical point of view, previous works were focused on performance optimization of such systems for simple flows, meaning uniform and permanent. If the understanding of such systems under these idealized conditions is an essential preliminary step, to understand the effect of temporal and spatial variability of geophysical flows on the efficiency is a second step just as essential. In particular, winds and currents are by nature turbulent, vary at a day or a season scale, and are deeply heterogeneous in space due to the fact they interact with the geographical features. To understand the robustness of these systems performances with respect to these complexities represents a major challenge in terms of fluidic mechanics for the next years.