THE CITY COLLEGE OF NEW YORK
CHEMICAL ENGINEERING DEPARTMENT
Professor Michaël Deschamps
University of Orléans France
Monday, May 7, 2018
Seminar will be held in MR-1307 (Marshak Building) at 2:00 PM
Reception will be held in Steinman Hall, Exhibit Room – 1st Floor
From 3:00 – 3:30 PM
Pulsed Field Gradients, diffusion and spectroscopic imaging of supercapacitors and batteries
Pulsed Field Gradients have long been used for diffusion measurements. However, obtaining diffusion coefficients from other materials than liquids can be challenging. In solids, anisotropic diffusion must be taken into account in 1D or 2D ionic conductors such as Li10GeP2S12 or Li3N. In porous systems, MAS and susceptibility matched materials can be used to model battery electrodes, and self-diffusion coefficients measurements show an unexpected effect from carbon black additives. On the other hand, PFG can also be used to localise the spins in an electrochemical device. However, short relaxation times in batteries and supercapacitors lead us to revisit long forgotten methods to obtain spectroscopic images.
Michaël Deschamps is a professor of materials chemistry at the University of Orléans (France), and heads the “Matériaux et Résonance : Conception, Caractérisation et Applications” group at the CNRS laboratory CEMHTI (UPR 3079 Extreme Conditions and Materials: High Temperature and Irradiation). He got his BSc in Chemistry, MSc in Physical Chemistry and Spectroscopy, and a PhD on Nuclear Magnetic Resonance in the group of Prof. G. Bodenhausen at the Ecole Normale Supérieure in Paris (France). He moved to the University of Oxford where he became a post-doctoral fellow and biochemistry tutor in the group of Prof. Iain D. Campbell, and was awarded an EMBO fellowship in 2003. During his post-doctoral years, his research focused on the structural determination of biomolecules by NMR. He obtained an Assistant Professor position in Orléans in 2005, was promoted to Associate Professor in 2013 and became a Junior member of the Institut Universitaire de France in 2014. Prof. M.Deschamps’ research is focused on the characterization of materials by NMR, with applications in batteries and supercapacitors, and he authored around 50 peer-reviewed papers.