✦ LIBER ✦

Dielectric properties of ammonium salt aqueous solutions

✍ Scribed by A. Lileev; A. Lyashchenko

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 731 KB
Volume: 150
Category: Article
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2009.08.008

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✦ Synopsis

High-frequency dielectric permittivity, dielectric losses and low-frequency conductivity of aqueous solutions of ammonium salts (NH 4 NO 3 , NH 4 BF 4 , NH 4 C1O 4 , NH 4 SO 3 NH 2 , NH 4 HSO 4 , (NH 4 ) 2 SO 4 , and NH 4 SCN) were measured at 288, 298 and 308 K. The parameters of the process of the dielectric relaxation (i.e. time τ and enthalpy of activation ΔH ε ++ ) were calculated. These values characterize the mobility of water molecules in solutions. The structure-breaking effect is found for all investigated ammonium salts. The variation of this effect for different anions in dependence on factors determining the molecular-kinetic hydration of ions (form, size, charge, etc.) is established.

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