Liquid 1-propanol studied by neutron scattering, near-infrared, and dielectric spectroscopy

Journal Article · Fri Mar 28 00:00:00 EDT 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4868556· OSTI ID:22253403

Sillrén, P.; Matic, A.; Karlsson, M. ^[1]; Koza, M.; Maccarini, M.; Fouquet, P. ^[2]; Götz, M.; Bauer, Th.; Gulich, R.; Lunkenheimer, P.; Loidl, A. ^[3]; Mattsson, J. ^[4]; Gainaru, C.; Vynokur, E.; Schildmann, S.; Bauer, S.; Böhmer, R. ^[5]

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1. Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg (Sweden)
2. Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9 (France)
3. Experimental Physics V, University of Augsburg, 86135 Augsburg (Germany)
4. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT (United Kingdom)
5. Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund (Germany)

Liquid monohydroxy alcohols exhibit unusual dynamics related to their hydrogen bonding induced structures. The connection between structure and dynamics is studied for liquid 1-propanol using quasi-elastic neutron scattering, combining time-of-flight and neutron spin-echo techniques, with a focus on the dynamics at length scales corresponding to the main peak and the pre-peak of the structure factor. At the main peak, the structural relaxation times are probed. These correspond well to mechanical relaxation times calculated from literature data. At the pre-peak, corresponding to length scales related to H-bonded structures, the relaxation times are almost an order of magnitude longer. According to previous work [C. Gainaru, R. Meier, S. Schildmann, C. Lederle, W. Hiller, E. Rössler, and R. Böhmer, Phys. Rev. Lett. 105, 258303 (2010)] this time scale difference is connected to the average size of H-bonded clusters. The relation between the relaxation times from neutron scattering and those determined from dielectric spectroscopy is discussed on the basis of broad-band permittivity data of 1-propanol. Moreover, in 1-propanol the dielectric relaxation strength as well as the near-infrared absorbance reveal anomalous behavior below ambient temperature. A corresponding feature could not be found in the polyalcohols propylene glycol and glycerol.

• OSTI ID: 22253403
• Journal Information: Journal of Chemical Physics, Vol. 140, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMBIENT TEMPERATURE
DIELECTRIC MATERIALS
GLYCEROL
GLYCOLS
HYDROGEN
LIQUIDS
NEUTRON DIFFRACTION
NEUTRONS
PEAKS
PERMITTIVITY
PROPANOLS
PROPYLENE
RELAXATION
SPECTROSCOPY
SPIN ECHO
STRUCTURE FACTORS