Journal article
Dielectric spectroscopy of hydrogen bond dynamics and microheterogenity of water + dioxane mixtures
Journal of Physical Chemistry B, Vol.111(21), pp.5946-5955
2007
Abstract
Mixtures of water or D20 + 1,4-dioxane (DX) have been studied at 25°C by dielectric relaxation spectroscopy over a wide range of frequencies (0.2 ≤ v/GHz ≤ 89) for DX mole fractions 0 ≤ x2 ≤ 0.67. The spectra were best fitted by the sum of two Debye terms. The slower process was assigned to the cooperative relaxation of the hydrogen-bond network of water, whereas the faster mode reflects the dynamics of H2O molecules in a DX-rich environment. Analysis of the relaxation parameters revealed a largely microheterogeneous structure of the mixtures. The marked slowing-down of the cooperative mode on addition of DX is ascribed to the reduction of available H-bond acceptor sites and geometrical constraints on the H 2O molecules in the waterrich regions.
Details
- Title
- Dielectric spectroscopy of hydrogen bond dynamics and microheterogenity of water + dioxane mixtures
- Authors/Creators
- S. Schrödle (Author/Creator)G. Hefter (Author/Creator)R. Buchner (Author/Creator)
- Publication Details
- Journal of Physical Chemistry B, Vol.111(21), pp.5946-5955
- Publisher
- American Chemical Society
- Identifiers
- 991005543828407891
- Copyright
- © 2007 American Chemical Society.
- Murdoch Affiliation
- School of Chemical and Mathematical Science
- Language
- English
- Resource Type
- Journal article
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