Journal article
Dielectric relaxation of dilute aqueous NaOH, NaAl(OH)4 and NaB(OH)4
Journal of Physical Chemistry B, Vol.103(50), pp.11186-11190
1999
Abstract
The complex dielectric permittivity of aqueous NaOH (c ≤ 2 M) and of dilute (≤0.6 M) NaAl(OH)4 and NaB(OH)4 solutions in NaOH ([Na] = 1 M) at 25°C has been determined in the frequency range 0.2 ≤ v/GHz ≤ 20. All spectra could be represented by a single Cole-Cole relaxation time distribution attributed to the cooperative relaxation of the solvent. The concentration dependence of the effective hydration number of OH- has been determined. For aluminate and borate solutions the deduced parameters: effective conductivity Ke, static permittivity ε, relaxation time τ, and distribution parameter a suggest a 1:1 replacement of hydroxide by aluminate and borate, accompanied by a release of bound water. The lack of an ion-pair relaxation process despite notable ion association suggests that rapid proton exchange is important not only for the dynamics of OH- but also for Al(OH)4- and B(OH)4-.
Details
- Title
- Dielectric relaxation of dilute aqueous NaOH, NaAl(OH)4 and NaB(OH)4
- Authors/Creators
- R. Buchner (Author/Creator)G. Hefter (Author/Creator)P.M. May (Author/Creator)P. Sipos (Author/Creator)
- Publication Details
- Journal of Physical Chemistry B, Vol.103(50), pp.11186-11190
- Publisher
- American Chemical Society
- Identifiers
- 991005542526607891
- Copyright
- © Copyright 1999 by the American Chemical Society.
- Murdoch Affiliation
- School of Chemical and Mathematical Science
- Language
- English
- Resource Type
- Journal article
Metrics
49 Record Views