Axe(s) de recherche : Nanosciences et nanotechnologies pour la santé et l'énergie
Domaine(s) de compétence :
hydrogels composites, liquides ioniques, nanoconfinement, diffusion de neutrons
Doctorat en Physique (Université Pierre et Marie Curie)
BiographiePas de biographie pour le moment.
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Publications de Filippo Ferdeghini
« Ionic Liquids: evidence of the viscosity scale-dependence »par Filippo Ferdeghini
Scientif Reports , 2017
Liste des auteurs : Q. Berrod, F. Ferdeghini, J.-M. Zanotti, P. Judeinstein, D. Lairez, V. García Sakai, O. Czakkel, P. Fouquet & D. Constantin
Ionic Liquids (ILs) are a specific class of molecular electrolytes characterized by the total absence of co-solvent. Due to their remarkable chemical and electrochemical stability, they are prime candidates for the development of safe and sustainable energy storage systems. The competition between electrostatic and van der Waals interactions leads to a property original for pure liquids: they selforganize in fluctuating nanometric aggregates. So far, this transient structuration has escaped to direct clear-cut experimental assessment. Here, we focus on a imidazolium based IL and use particle-probe rheology to (i) catch this phenomenon and (ii) highlight an unexpected consequence: the self-diffusion coefficient of the cation shows a one order of magnitude difference depending whether it is inferred at the nanometric or at the microscopic scale. As this quantity partly drives the ionic conductivity, such a peculiar property represents a strong limiting factor to the performances of ILs-based batteries.
« Ionic Liquids Confined in Silica Ionogels: Structural, Thermal, and Dynamical Behaviors »par Filippo Ferdeghini
Entropy , 2017
Liste des auteurs : S. Mitra, C. Cerclier, Q. Berrod, F. Ferdeghini, R. de Oliveira Silva, P. Judeinstein, J. Le Bideau and J -M. Zanotti
Ionogels are porous monoliths providing nanometer-scale confinement of an ionic liquid within an oxide network. Various dynamic parameters and the detailed nature of phase transitions were investigated by using a neutron scattering technique, giving smaller time and space scales compared to earlier results from other techniques. By investigating the nature of the hydrogen mean square displacement (local mobility), qualitative information on diffusion and different phase transitions were obtained. The results presented herein show similar short-time molecular dynamics between pristine ionic liquids and confined ionic liquids through residence time and diffusion coefficient values, thus, explaining in depth the good ionic conductivity of ionogels.