|Thesis supervisor : ||
CNRS-UMR 12 - LLB01/Laboratoire de Diffusion Neutronique
01 69 08 63 00
Personal web page : http://iramis.cea.fr/Pisp/laurence.noirez/
Laboratory link : http://www-llb.cea.fr/
This experimental PhD training is proposed in the frame of a collaborative program CEA-Pays de la Loire Region. The aim is to propose a new physical and physico-chemistry approach of solid / liquid or liquid / air interfacial mechanisms. At the interface of a liquid and a solid, the imbalance between the inter-molecular energies and the surface energies (attractive and repulsive) creates an intermediate zone where the liquid-liquid and liquid-solid interactions are in competition. While the literature on the subject are abundant and the developments continuously increasing, the interfacial mechanisms involved are still obscure. In particular the questions around the thermal interfacial properties are now emerging being at the heart of modern electronic devices. Pioneering experiments conducted in collaboration between the Léon Brillouin Laboratory and the Institute of Molecules and Materials of Le Mans have recently shown that, when approaching the liquid / solid interface, a variation in temperature is observable . The temperature variation depends on the nature of the solid and the liquid in contact. This major discovery is a new field of investigation for the understanding of energy transfer mechanisms. It can lead to the development of passive energy converters and new technological solutions
In the frame of the PhD training it will be proposed to explore the characteristics of this novel interfacial property, its potentialities and locks. A bottom-up strategy is adopted consisting in describing how the first liquid molecules interact with the atoms of the solid in the case of high or low energy surfaces and how the energy is transferred from solid to far in the liquid. Model surfaces of different topography and of varied surface chemistry will be defined and used in order to control and characterize the surface forces (electrical, ionic or acid-base). Modern techniques of thermal analysis and of surface Raman micro-spectrometry combined with chemometric techniques will be used jointly to experimentally highlight the interfacial phenomena at several lengthscales. The candidate will also benefit of established international collaborations with worldwide leading individuals in modelling of soft matter properties from molecular up to mesoscopic and macroscopic scales. Rapid progress in understanding the mechanisms governing thermal equilibria is expected.
This program will be suitable for a student with solid skills in liquid physics, physico-chemistry of polymers or materials with a strong motivation for original experimental approaches to liquids, an interest in instrumentation and the use of Large Instruments (LLB, Soleil, ESRF) for scattering techniques.
1. L. Noirez, P. Baroni, J.F. Bardeau, Appl. Phys. Lett. 110 (2017) 213904.
2. L. Noirez, P. Baroni, J. Colloid and Surface, in press 2018.