Buchner, Richard and Hefter, Glenn T. and May, Peter M. (1999) Dielectric relaxation of aqueous NaCl solutions. JOURNAL OF PHYSICAL CHEMISTRY A, 103 (1). pp. 1-9. ISSN 1089-5639,
Full text not available from this repository. (Request a copy)Abstract
The complex dielectric permittivity of aqueous sodium chloride solutions has been determined in the frequency range 0.2 less than or equal to v(GHz) less than or equal to 20 with a commercial dielectric measurement system based on a vector network analyzer. NaCl solutions 0.1 less than or equal to nz (mol kg(-1)) less than or equal to 5 (mass fraction 0.005 less than or equal to w less than or equal to 0.23) were investigated at 5, 20, 25, and 35 degrees C. An improved calibration procedure of the dielectric measurement system for conducting samples was developed, The complex permittivity spectra have been represented by a Cole-Cole relaxation time distribution. Where possible, the obtained fitting parameters, static permittivity epsilon and relaxation time tau, and distribution parameter cr, are compared with literature data to assess the performance of the instrument, which was found to be comparable to that of time domain and waveguide systems. Effective solvation numbers were deduced from the effect of NaCl concentration on epsilon. The data suggest that in addition to the irrotational bonding of water molecules by Na+ ions, kinetic depolarization under slip boundary conditions determines the solution permittivity. A three-state model is proposed to describe the concentration dependence of tau.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MOLECULAR-DYNAMICS SIMULATION; ELECTROLYTE-SOLUTIONS; MICROWAVE-FREQUENCIES; SUPERCRITICAL WATER; LIQUID WATER; ION; PERMITTIVITY; TEMPERATURE; CHEMISTRY; PRESSURES; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Nov 2022 15:15 |
| Last Modified: | 22 Nov 2022 15:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48584 |
Actions (login required)
 |
View Item |
