Dopant effects on 2-ethyl-1-hexanol: a dual-channel impedance spectroscopy and neutron scattering study.
In: The Journal of chemical physics, Jg. 142 (2015-01-07), Heft 1, S. 014501
academicJournal
Zugriff:
A two-channel impedance technique has been used to study the relaxation behavior of 2-ethyl-1-hexanol with polar and non-polar dopants at the few percent concentration level over a wide temperature and frequency range. The non-polar dopants shift both the Debye and the primary structural relaxation time in the same direction, to shorter times for 3-methylpentane and to longer times for squalane, consistent with the relative glass transition temperatures (Tg) of the components. By contrast, polar dopants such as water or methanol modify the α-process towards slower dynamics and increased amplitude, while the Debye process is accelerated and with a decreased amplitude. This effect of adding water to alcohol is explained by water promoting more compact structures with reduced Kirkwood correlation factors. This picture is consistent with a shift in the neutron scattering pre-peak to lower scattering vectors and with simulation work on alcohol-water systems.
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Dopant effects on 2-ethyl-1-hexanol: a dual-channel impedance spectroscopy and neutron scattering study.
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Autor/in / Beteiligte Person: | Singh, LP ; Raihane, A ; Alba-Simionesco, C ; Richert, R |
Zeitschrift: | The Journal of chemical physics, Jg. 142 (2015-01-07), Heft 1, S. 014501 |
Veröffentlichung: | New York, NY : American Institute of Physics ; <i>Original Publication</i>: Lancaster, Pa., American Institute of Physics., 2015 |
Medientyp: | academicJournal |
ISSN: | 1089-7690 (electronic) |
DOI: | 10.1063/1.4904908 |
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