dc.contributor.author | VIJ, JAGDISH KUMAR | en |
dc.date.accessioned | 2010-08-18T15:39:54Z | |
dc.date.available | 2010-08-18T15:39:54Z | |
dc.date.issued | 2000 | en |
dc.date.submitted | 2000 | en |
dc.identifier.citation | Kalinovskaya, 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 - 3266 | en |
dc.identifier.other | Y | en |
dc.description | PUBLISHED | en |
dc.description.abstract | To 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.sponsorship | We 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.extent | 3262 | en |
dc.format.extent | 3266 | en |
dc.language.iso | en | en |
dc.relation.ispartofseries | Journal of Chemical Physics | en |
dc.relation.ispartofseries | 112 | en |
dc.relation.ispartofseries | 7 | en |
dc.rights | Y | en |
dc.subject | Condensed matter physics | en |
dc.subject | dielectric relaxation | en |
dc.title | The exponential dielectric relaxation dynamics in a secondary alcohol's supercooled liquid and glassy states | en |
dc.type | Journal Article | en |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/jvij | en |
dc.identifier.rssinternalid | 24475 | en |
dc.identifier.rssuri | http://dx.doi.org/10.1063/1.480909 | en |
dc.identifier.uri | http://hdl.handle.net/2262/40541 | |