NDLI: Viscosity of deeply supercooled water and its coupling to molecular diffusion.

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Viscosity of deeply supercooled water and its coupling to molecular diffusion.

Content Provider	Semantic Scholar
Author	Dehaoui, Amine Issenmann, Bruno Caupin, Frédéric
Copyright Year	2015
Abstract	The viscosity of a liquid measures its resistance to flow, with consequences for hydraulic machinery, locomotion of microorganisms, and flow of blood in vessels and sap in trees. Viscosity increases dramatically upon cooling, until dynamical arrest when a glassy state is reached. Water is a notoriously poor glassformer, and the supercooled liquid crystallizes easily, making the measurement of its viscosity a challenging task. Here we report viscosity of water supercooled close to the limit of homogeneous crystallization. Our values contradict earlier data. A single power law reproduces the 50-fold variation of viscosity up to the boiling point. Our results allow us to test the Stokes-Einstein and Stokes-Einstein-Debye relations that link viscosity, a macroscopic property, to the molecular translational and rotational diffusion, respectively. In molecular glassformers or liquid metals, the violation of the Stokes-Einstein relation signals the onset of spatially heterogeneous dynamics and collective motions. Although the viscosity of water strongly decouples from translational motion, a scaling with rotational motion remains, similar to canonical glassformers.
File Format	PDF HTM / HTML
DOI	10.1073/pnas.1508996112
PubMed reference number	26378128
Journal	Medline
Volume Number	112
Issue Number	39
Alternate Webpage(s)	http://www.pnas.org/content/112/39/12020.full.pdf
Alternate Webpage(s)	http://ilm-perso.univ-lyon1.fr/~fcaupin/fichiersPDF/Dehaoui_PNAS_2015_full.pdf
Journal	Proceedings of the National Academy of Sciences of the United States of America
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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