title: Relaxation dynamics in glycerol-water mixtures: I. Glycerol-rich mixtures.
abstract: We discuss the relaxation dynamics of glycerol-water mixtures, as studied by dielectric spectroscopy in the frequency range from 1 Hz to 250 MHz and at temperatures between 173 and 323 K. The experimental results obtained for the glycerol-rich mixtures suggest that the main dielectric relaxation process, as well as the so-called high-frequency "excess wing" (EW) and dc conductivity, follow the same temperature dependence. This result indicates that all of these processes are induced by the same molecular origin. A new phenomenological function is proposed to describe the whole dielectric spectrum in the covered frequency range, and some possible mechanisms of dielectric behaviors through the dc conductivity, the main relaxation process, and the EW are discussed.
authors.affiliation: Department of Applied Physics, The Hebrew University of Jerusalem, Givat Ram, 91904 Jerusalem, Israel.
authors.forename: Alexander
authors.initials: A
authors.lastname: Puzenko
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Yaroslav E
authors.initials: YE
authors.lastname: Ryabov
authors.forename: Igal
authors.initials: I
authors.lastname: Balin
authors.forename: Yuri
authors.initials: Y
authors.lastname: Feldman
authors.forename: Udo
authors.initials: U
authors.lastname: Kaatze
authors.forename: Ralph
authors.initials: R
authors.lastname: Behrends
mesh_terms: D005990:Glycerol / Q000737:chemistry*; D012996:Solutions; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D012996:Solutions; D014867:Water; D005990:Glycerol