STUDIES FROM YEREVAN STATE UNIVERSITY YIELD NEW DATA ON FLUIDS RESEARCH
Science Letter
July 7, 2009
"Complex dielectric spectra of diethylsulfoxide (DESO)/water mixtures
at 25C over the entire concentration range of DESO, in the frequency
range 0.2 /GHz 89 have been measured. In general, a description of the
complex permittivity spectra requires a consideration of different
types of relaxation processes depending upon DESO concentration,"
scientists writing in the journal Physics and Chemistry of Liquids
report (see also Fluids Research).
"For the lower DESO concentration range the relaxation contribution
to the spectrum is described by two Debye terms, whereas for higher
concentration three Debye terms are used. For both at mol fraction
equals to 0.9 and pure DESO as well Cole-Davidson type is valid. In
addition, the data on the dimethylsulfoxide (DMSO)/water system
obtained in this work well agree with those known from literature,"
wrote S.A. Markarian and colleagues, Yerevan State University.
The researchers concluded: "The concentration dependent excess
dielectric constant, excess inverse relaxation time and Kirkwood
correlation factor of the mixtures have been determined.."
Markarian and colleagues published their study in Physics and Chemistry
of Liquids (Dielectric relaxation study of diethylsulfoxide/water
mixtures. Physics and Chemistry of Liquids, 2009;47(3):311-321).
Additional information can be obtained by contacting S.A. Markarian,
Yerevan State University, Dept. of Chemical, Yerevan 375049, Armenia.
The publisher of the journal Physics and Chemistry of Liquids can
be contacted at: Taylor & Francis Ltd., 4 Park Square, Milton Park,
Abingdon OX14 4RN, Oxon, England.