期刊
JOURNAL OF CHEMICAL PHYSICS
卷 142, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4904908
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资金
- National Science Foundation [CHE-1026124]
- L'Agence Nationale de la Rechereche [ANR-10-BLAN-0821]
- Agence Nationale de la Recherche (ANR) [ANR-10-BLAN-0821] Funding Source: Agence Nationale de la Recherche (ANR)
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 (T-g) of the components. By contrast, polar dopants such as water or methanol modify the a-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. (C) 2015 AIP Publishing LLC.
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