The CEMHTI laboratory is affiliated to the CNRS and is composed of 2 sites (high temperature and cyclotron sites) regrouping about 100 people.
The laboratory develops original expertise and tools on a national and international level to study in situ the physico-chemical properties of materials under extreme conditions.
The doctoral student will be based on the laboratory's high temperature site, will integrate the “Materials and Resonance” group under the supervision of Pr. Michael Deschamps and Dr. Vincent Sarou-Kanian
The CEMHTI laboratory has 6 NMR spectrometers from 200 to 850 MHz, equipped with MAS probes and imaging devices. The thesis has public funding and the project is carried out in partnership with CEMHTI and RS2E (French research network on electrochemical energy storage) research groups for the supply of study materials.
Study on liquid/solid interactions in porous materials by Nuclear Magnetic Resonance
The interactions between the surface of a material and the ions of an electrolyte are of paramount importance for many scientific fields, such as batteries, fuel cells, catalysis, colloids, ceramics, geology... The main parameter describing these interactions is the zeta potential, which represents the electrical charge that a particle acquires through the surrounding ions in solution. The zeta potential measurement generally uses macroscopic measurements to determine this overall charge.
NMR spectroscopy provides information on the chemical environment of spin-bearing nuclei. In particular, the presence of internal magnetic field gradients at the solid-liquid interface makes it possible to discriminate the proximity of the ions near the surface, and by the same to specifically explore the ion-surface interactions, and to investigate the influence of the nature of the ion, the pH, the ionic strength of the solution, the surface condition... The understanding of these phenomena are extremely relevant: for example, the evolution of the electrochemical potential of a lithium battery electrode material may result in a modification of its surface properties and cause a preferential adsorption of cations or anions likely to change the dynamics of lithium exchange between the two phases.
The objective of the thesis is to explore the use of NMR for the characterization of ion-surface interactions, for several applications (batteries, photo-catalysis and biomaterials). The project involves the study of liquid-solid mixtures by conventional NMR spectroscopy, the development of a powder impregnation system and the use of imaging sequences (MRI) to study the impregnation of systems.
The CEMHTI laboratory has 6 NMR spectrometers from 200 to 850 MHz, equipped with MAS probes and imaging devices. The thesis has public funding and the project is carried out in partnership with CEMHTI and RS2E (French research network on electrochemical energy storage) research groups for the supply of study materials
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