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.
Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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Sillrén
Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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A
Matic
Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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M
Karlsson
Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France.
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M
Koza
Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France.
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M
Maccarini
Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France.
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P
Fouquet
Experimental Physics V, University of Augsburg, 86135 Augsburg, Germany.
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M
Götz
Experimental Physics V, University of Augsburg, 86135 Augsburg, Germany.
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T
Bauer
Experimental Physics V, University of Augsburg, 86135 Augsburg, Germany.
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R
Gulich
Experimental Physics V, University of Augsburg, 86135 Augsburg, Germany.
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P
Lunkenheimer
Experimental Physics V, University of Augsburg, 86135 Augsburg, Germany.
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A
Loidl
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom.
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J
Mattsson
Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany.
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C
Gainaru
Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany.
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E
Vynokur
Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany.
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S
Schildmann
Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany.
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S
Bauer
Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany.
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R
Böhmer
D000433:1-Propanol / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D033363:Neutron Diffraction; D053838:Scattering, Small Angle; D019265:Spectroscopy, Near-Infrared
D000433:1-Propanol