Deeply supercooled aqueous LiCl solution studied by frequency-resolved shear rheology

Philipp Münzner; Lars Hoffmann; Roland Böhmer; Catalin Gainaru

doi:10.1063/1.5100600

Deeply supercooled aqueous LiCl solution studied by frequency-resolved shear rheology

Philipp Münzner, Lars Hoffmann, Roland Böhmer, Catalin Gainaru

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17 Scopus citations

Abstract

To characterize the structural relaxation of an aqueous solution of LiCl, frequency-dependent shear rheological experiments are carried out near its glass transition. Analyzed within the fluidity representation, the generic spectral shape that was previously found for a range of different kinds of glass formers is confirmed for the currently studied hydrogen-bonded fluid as well. Furthermore, the validity of the rheological equivalent of the Barton-Nakajima-Namikawa relation is demonstrated for the aqueous LiCl solution. Its mechanical response is compared with that obtained using dielectric spectroscopy, a technique which is sensitive to both the reorientational dynamics of the water molecules and the translational dynamics of the ionic species. The extent to which these electrical polarization processes are coupled to those governing the viscoelastic response is discussed, also in comparison with the behavior of other ion conducting liquids.

Original language	English
Article number	234505
Journal	Journal of Chemical Physics
Volume	150
Issue number	23
DOIs	https://doi.org/10.1063/1.5100600
State	Published - Jun 21 2019
Externally published	Yes

Funding

We thank the Deutsche Forschungsgemeinschaft (Grant Nos. BO1301/14-1 and GA2680/1-1) for supporting this project financially and Peter Lunkenheimer for providing us with the dielectric data of the LiCl-water solution from Ref. 7.

Funders	Funder number
Deutsche Forschungsgemeinschaft	BO1301/14-1, GA2680/1-1

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Deeply supercooled aqueous LiCl solution studied by frequency-resolved shear rheology

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