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dc.contributor.authorVIJ, JAGDISH KUMAR
dc.date.accessioned2010-07-14T09:37:27Z
dc.date.available2010-07-14T09:37:27Z
dc.date.issued2002
dc.date.submitted2002en
dc.identifier.citationPower, G.; Johari, G. P.; Vij, J. K., Effects of ions on the dielectric permittivity and relaxation rate and the decoupling of ionic diffusion from dielectric relaxation in supercooled liquid and glassy 1-propanol, Journal of Chemical Physics, 116, 10, 2002, 4192 - 4201en
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/40305
dc.descriptionPUBLISHEDen
dc.description.abstractThe effects of intermolecular H bonds on the equilibrium permittivity, ?s, the relaxation rate, fm, and changes in the dielectric relaxation spectra of 1-propanol were studied by adding a strongly dissociating electrolyte LiClO4. The spectra of both 1 mol?% LiClO4 containing 1-propanol (1 molecule of LiClO4 per 99 molecules of 1-propanol), and of pure 1-propanol were measured over a temperature range from ~90?160 K in the frequency range 1 mHz?1 MHz. An analysis of the spectra showed that the three relaxation processes (I, II, and III in ascending rapidity), that occur in the pure alcohol persist in the presence of ions, the equilibrium permittivity, ?s, decreases, the distribution characteristics of the processes changes, and the rate of relaxation, fm, of processes I and III remains constant within analytical errors, while that of process II is reduced. The temperature dependencies of fm,I and fm,II are non-Arrhenius while that of fm,III is Arrhenius. The temperature dependence of the dc conductivity, ?0 is also non-Arrhenius, but the parameters of the fit differ from those of fm,I and are closer to those of fm,II. Its 1000-fold increase on adding 1 mol?% LiClO4 is due to the increase in ion concentration and a decrease in the viscosity as a result of the breaking of H bonds. However, as fm,I and fm,III remain constant on the addition of LiClO4, and fm,II decreases slightly, an expected decrease in viscosity would seem to be unrelated to the relaxation rates of these processes. In that case, ?0 is decoupled from these dipolar relaxation modes.en
dc.description.sponsorshipThe research was supported by an NSERC general research grant to G.P.J. J.K.V. thanks Intel Ireland Ltd. for funding the studentship of G.P. and Enterprise Ireland for the award of a small international cooperation grant for funding the visit of G.P.J. The authors also thank Professor B. K. P. Scaife for discussions.en
dc.format.extent4192en
dc.format.extent4201en
dc.language.isoenen
dc.publisherAmerican Institute of Physicsen
dc.relation.ispartofseriesJournal of Chemical Physics;
dc.relation.ispartofseries116;
dc.relation.ispartofseries10;
dc.rightsYen
dc.subjectPolymersen
dc.subjectorganic compoundsen
dc.titleEffects of ions on the dielectric permittivity and relaxation rate and the decoupling of ionic diffusion from dielectric relaxation in supercooled liquid and glassy 1-propanolen
dc.typeJournal Articleen
dc.contributor.sponsorNatural Environment Research Council (NERC)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jvij
dc.identifier.rssinternalid24383
dc.identifier.rssurihttp://dx.doi.org/10.1063/1.1448289en


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