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

Per Sillrén (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Aleksandar Matic (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Maths Karlsson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; M. Koza ; M. Maccarini ; P. Fouquet ; M. Goetz ; T. Bauer ; R. Gulich ; P. Lunkenheimer ; A. Loidl ; J. Mattsson ; C. Gainaru ; E. Vynokur ; S. Schildmann ; S. Bauer ; R. Bohmer
Journal of Chemical Physics (0021-9606). Vol. 140 (2014), 12,
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2014-05-27. Senast ändrad 2015-12-17.
CPL Pubid: 198636

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur

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