TY - JOUR
T1 - Liquid 1-propanol studied by neutron scattering, near-infrared, and dielectric spectroscopy
AU - Sillrén, P.
AU - Matic, A.
AU - Karlsson, M.
AU - Koza, M.
AU - MacCarini, M.
AU - Fouquet, P.
AU - Götz, M.
AU - Bauer, Th
AU - Gulich, R.
AU - Lunkenheimer, P.
AU - Loidl, A.
AU - Mattsson, J.
AU - Gainaru, C.
AU - Vynokur, E.
AU - Schildmann, S.
AU - Bauer, S.
AU - Böhmer, R.
PY - 2014/3/28
Y1 - 2014/3/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84897549226&partnerID=8YFLogxK
U2 - 10.1063/1.4868556
DO - 10.1063/1.4868556
M3 - Article
C2 - 24697453
AN - SCOPUS:84897549226
SN - 0021-9606
VL - 140
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 12
M1 - 124501
ER -