Speaker: Dr. Vasily Artemov (Prokhorov General Physics Institute, Moscow, Russia)
When: November, 20 at 4-5.30 p.m.
Where: MR-303 (multifunctional zone, TPOC-3)
Abstract. Water serves as an electrolyte and medium for proton transport in alternative energy devices, however its properties are not fully understood. We discuss practically important electrical properties of water (dc-conductivity, dielectric permittivity and microwave absorption) simultaneously in relation to the broadband dielectric spectrum. We present a radically new understanding of the atomic-molecular dynamics in water and show that the most suitable mechanism of the water dielectric response below 1 THz is intermolecular migration of excess protons/proton holes. The ambipolar diffusion of the H3O+ and OH- ions in high concentration appears to be responsible for both the dielectric constant and the dc-conductivity. The talk is based on the joint work with A. Volkov.
Bio. Dr Vasily Artemov is head of the Laboratory of intermolecular interactions spectroscopy of the Prokhorov Institute of General Physics in Moscow. As an expert in the field of physical chemistry of water, his main research interests include ionic transport, broadband dielectric spectroscopy, IR spectroscopy, water and ice dielectric properties, transport phenomena in porous media, and fuel cells.