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

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.
Authors:
; ;  [1] ; ; ;  [2] ; ; ; ; ;  [3] ;  [4] ; ; ; ; ;  [5]
  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)
Publication Date:
OSTI Identifier:
22253403
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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