Liquid 1-propanol studied by neutron scattering, near-infrared, and dielectric spectroscopy
Artikel i vetenskaplig tidskrift, 2014

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.

Författare

Per Sillrén

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Maths Karlsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

M. Koza

Institut Laue-Langevin

M. Maccarini

Institut Laue-Langevin

P. Fouquet

Institut Laue-Langevin

M. Goetz

Universität Augsburg

T. Bauer

Universität Augsburg

R. Gulich

Universität Augsburg

P. Lunkenheimer

Universität Augsburg

A. Loidl

Universität Augsburg

J. Mattsson

University of Leeds

C. Gainaru

TU Dortmund University

E. Vynokur

TU Dortmund University

S. Schildmann

TU Dortmund University

S. Bauer

TU Dortmund University

R. Bohmer

TU Dortmund University

Journal of Chemical Physics

0021-9606 (ISSN) 1089-7690 (eISSN)

Vol. 140 124501

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1063/1.4868556