Dielectric relaxation in dimethyl sulfoxide/water mixtures

Z. Lu, E. Manias, M. Lanagan, D. D. Macdonald

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations


Dielectric spectra of dimethyl sulfoxide (DMSO)/water mixtures, over the entire concentration range, were measured using the transmission line method at frequencies from 45 MHz to 26 GHz and at temperatures of 298-318 K. The relaxation times of the mixtures showed a maximum at an intermediate molar fraction of DMSO. A water structure "breaking effect", manifested by a reduced average number of hydrogen bonds per water molecule, was observed in dilute aqueous solutions based on the dielectric relaxation dynamics analysis. The increase in the dielectric relaxation time in DMSO/water mixtures was attributed to the spatial (steric) constraints of DMSO molecules on the hydrogen bond network, rather than being due to hydrophobic hydration of the methyl groups. The interactions between water and DMSO molecules in DMSO-rich mixtures are also discussed.

Original languageEnglish (US)
Title of host publicationPhysical and Analytical Electrochemistry (General) - 217th ECS Meeting
PublisherElectrochemical Society Inc.
Number of pages11
ISBN (Electronic)9781566778442
ISBN (Print)9781607681946
StatePublished - 2010

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

All Science Journal Classification (ASJC) codes

  • General Engineering


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