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dc.contributor.authorVIJ, JAGDISH KUMARen
dc.date.accessioned2010-08-18T15:39:54Z
dc.date.available2010-08-18T15:39:54Z
dc.date.issued2000en
dc.date.submitted2000en
dc.identifier.citationKalinovskaya, O.E., Vij, J.K., The exponential dielectric relaxation dynamics in a secondary alcohol's supercooled liquid and glassy states , Journal of Chemical Physics, 112, 7, 2000, 3262 - 3266en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/40541
dc.descriptionPUBLISHEDen
dc.description.abstractTo gain insight into a recent observation that the prominent, Debye-type relaxation process observed for a primary alcohol may not be the a-relaxation process associated with molecular diffusion of a liquid @Europhys. Lett. 40, 549 ~1997!, J. Chem. Phys. 107, 1086 ~1997!#, the dielectric spectra of an uncrystallizable secondary alcohol, 5-methyl-2-hexanol, has been investigated by broadband spectroscopy. Measurements made over a temperature range from 110 to 298 K showed that three relaxation processes occur. Processes I and II have a non-Arrhenius variation of the relaxation rate with temperature, and process III an Arrhenius. Only process I, the slowest of the three, has a single relaxation rate, the other two, a broad distribution. The contribution to permittivity from process II was 0.8, i.e., ;3% of the static permittivity, and from process III, the fastest was 0.1, i.e., ;0.3%. It is argued that the mechanism of process I is the breaking followed by dipolar reorientation and reforming of the H-bonds in the intermolecularly H-bonded structure, and process II is that of the orientation of the other dipolar groups, such as the -OR group. Process III is the usual Johari? Goldstein process. For 5-methyl-2-hexanol, the mode-coupling and another theory by Souletie and Bertrand @J. Phys. I 1, 1627 ~1991!# seem to agree with the relaxation rate of processes I and II, and predict temperatures for 1024 Hz relaxation rate, within a few degrees of that expected.en
dc.description.sponsorshipWe thank the American Petroleum Research Fund administered by the American Chemical Society, PRF #33221- AC7, for funding this work. We are extremely grateful to Professor G. P. Johari for having suggested the work, for his supervision, and for the very many stimulating discussions during the course of writing of this article.en
dc.format.extent3262en
dc.format.extent3266en
dc.language.isoenen
dc.relation.ispartofseriesJournal of Chemical Physicsen
dc.relation.ispartofseries112en
dc.relation.ispartofseries7en
dc.rightsYen
dc.subjectCondensed matter physicsen
dc.subjectdielectric relaxationen
dc.titleThe exponential dielectric relaxation dynamics in a secondary alcohol's supercooled liquid and glassy statesen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jvijen
dc.identifier.rssinternalid24475en
dc.identifier.rssurihttp://dx.doi.org/10.1063/1.480909en


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