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

11 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
Number of pages11
StatePublished - 2010
EventPhysical and Analytical Electrochemistry General Session - 217th ECS Meeting - Vancouver, BC, Canada
Duration: Apr 25 2010Apr 30 2010

Publication series

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


OtherPhysical and Analytical Electrochemistry General Session - 217th ECS Meeting
CityVancouver, BC

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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