TU Darmstadt / ULB / TUbiblio

Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions

Lederle, C. and Hiller, W. and Gainaru, C. and Böhmer, R. (2011):
Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions.
134, In: Journal of chemical physics, (6), American Institute of Physics, pp. 064512, ISSN 0021-9606, [Article]

Abstract

Mixtures of the monohydroxy alcohol n-butanol with n-bromobutane are investigated via dielectric and nuclear magnetic resonance (NMR) techniques. Static- and pulsed-field gradient proton NMR yielded self-diffusion coefficients as a function of concentration and temperature. To monitor reorientational motions, broadband dielectric and (13)C-spin relaxation time measurements were carried out. The latter demonstrate that the structural relaxation stems from the motion of the alkyl chains. By combining data from translational diffusion coefficients with published shear viscosities, hydrodynamic radii were determined that compare favorably with the van der Waals radii of single molecules. The results for the neat alcohol and for the binary mixtures are discussed with respect to a recent transient chain model. The approach of Debye and structural relaxation times at high temperatures, identified as a general feature of monohydroxy alcohols, is also discussed within that framework.

Item Type: Article
Erschienen: 2011
Creators: Lederle, C. and Hiller, W. and Gainaru, C. and Böhmer, R.
Title: Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions
Language: English
Abstract:

Mixtures of the monohydroxy alcohol n-butanol with n-bromobutane are investigated via dielectric and nuclear magnetic resonance (NMR) techniques. Static- and pulsed-field gradient proton NMR yielded self-diffusion coefficients as a function of concentration and temperature. To monitor reorientational motions, broadband dielectric and (13)C-spin relaxation time measurements were carried out. The latter demonstrate that the structural relaxation stems from the motion of the alkyl chains. By combining data from translational diffusion coefficients with published shear viscosities, hydrodynamic radii were determined that compare favorably with the van der Waals radii of single molecules. The results for the neat alcohol and for the binary mixtures are discussed with respect to a recent transient chain model. The approach of Debye and structural relaxation times at high temperatures, identified as a general feature of monohydroxy alcohols, is also discussed within that framework.

Journal or Publication Title: Journal of chemical physics
Volume: 134
Number: 6
Publisher: American Institute of Physics
Uncontrolled Keywords: 1-Butanol/ chemistry Hydrocarbons, Brominated/ chemistry Hydrogen Bonding Magnetic Resonance Spectroscopy Motion Rotation Solutions Temperature
Divisions: 05 Department of Physics
05 Department of Physics > Institute for condensed matter physics
Date Deposited: 28 Jan 2014 10:24
Additional Information:

Lederle, Christina Hiller, Wolf Gainaru, Catalin Bohmer, Roland Comparative Study Research Support, Non-U.S. Gov't United States J Chem Phys. 2011 Feb 14;134(6):064512. doi: 10.1063/1.3549123.

Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item