dc.contributor.author | VIJ, JAGDISH KUMAR | |
dc.date.accessioned | 2010-08-19T13:00:04Z | |
dc.date.available | 2010-08-19T13:00:04Z | |
dc.date.issued | 1999 | |
dc.date.submitted | 1999 | en |
dc.identifier.citation | O. E. Kalinovskaya and J. K. Vij, Molecular dynamics of iso-amyl bromide by dielectric spectroscopy, and the effects of a nonpolar solvent, 2-methylpentane, on the spectral features, Journal of Chemical Physics, 111, 24, 1999, 10979 - 10985 | en |
dc.identifier.other | Y | |
dc.description | PUBLISHED | en |
dc.description.abstract | To gain insight into the effects of the weakening of the electrostatic interactions on molecular
dynamics when polar molecules are dissolved in a nonpolar solvent, the dielectric polarization and
relaxation behaviors of iso-amylbromide and its 50 mol% solution in 2-methylpentane have been
studied in detail over the frequency range, 1 mHz?1 MHz, and a temperature range approaching
their liquid to glass transition. Features of the ~i! a-relaxation spectrum, ~ii! the Johari?Goldstein
relaxation process in the liquid state at low temperatures, with an asymmetric spectral shape, and
~iii! the temperature dependence of the relaxation dynamics have been determined and the effects of
weakening of the electrostatic interaction on these features examined. The high-frequency wing of
the loss spectrum of the a-relaxation is proportional to v2b. The dynamics of its a-relaxation
follows the Arrhenius equation initially at high temperatures and thereafter the Vogel?Fulcher?
Tamman equation. Alternative equations for the change in the relaxation rate have been discussed.
A decrease in the dipole?dipole interaction and reduction in the internal field in a solution with a
nonpolar solvent leads to a remarkable change in the shape of the relaxation spectra at high
frequencies such that the dielectric loss for the a-relaxation becomes proportional to v2ab, with a,
b,1. The relaxation spectra of iso-amyl bromide dissolved in 2-methylpentane follows the H?N
function and therefore behaves similar to a polymer, whereas for pure iso-amyl bromide follows the
Davidson?Cole behavior. | en |
dc.description.sponsorship | The research was funded by the American Petroleum
Research Fund PRF# 33221-AC7 administered by the
American Chemical Society and we acknowledge our
thanks. We are grateful to Professor G. P. Johari for many
stimulating discussions during the course of the writing of
this paper, and to Dr. S. Havriliak Jr. for suggesting us to
initiate this work. We thank Professor J. G. Berberian for
providing his data on pure iso-amyl bromide along with the
listing of the data from Dr. D. J. Denney and Dr. S. H.
Glarum, Table I. | en |
dc.format.extent | 10979 | en |
dc.format.extent | 10985 | en |
dc.language.iso | en | en |
dc.publisher | American Institute of Physics | en |
dc.relation.ispartofseries | Journal of Chemical Physics; | |
dc.relation.ispartofseries | 111; | |
dc.relation.ispartofseries | 24; | |
dc.rights | Y | en |
dc.subject | Condensed matter physics | en |
dc.subject | dielectric relaxation | en |
dc.title | Molecular dynamics of iso-amyl bromide by dielectric spectroscopy, and the effects of a nonpolar solvent, 2-methylpentane, on the spectral features | 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 | |
dc.identifier.rssinternalid | 24419 | |
dc.identifier.rssuri | http://dx.doi.org/10.1063/1.480489 | en |
dc.identifier.uri | http://hdl.handle.net/2262/40558 | |