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Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2015 ; 112 (39): 12020-5 Nephropedia Template TP
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Viscosity of deeply supercooled water and its coupling to molecular diffusion #MMPMID26378128
Dehaoui A; Issenmann B; Caupin F
Proc Natl Acad Sci U S A 2015[Sep]; 112 (39): 12020-5 PMID26378128show ga
Water is the most ubiquitous liquid but also the most anomalous. In usual fluids far from their glass transition, viscosity and molecular diffusion are coupled through the Stokes?Einstein relations. For water, viscosity already starts decoupling from translational diffusion below 20°C. Simulations have suggested a connection with the putative separation of supercooled water into two distinct liquid phases. Whereas experimental diffusion data extend far in the supercooled region, accurate viscosity data were lacking due to the readiness of supercooled water to crystallize under the slightest perturbation. Using Brownian motion of spheres suspended in water, we have measured its viscosity down to ?34°C without freezing. We find that whereas viscosity decouples increasingly from molecular translation upon cooling, it remains coupled to rotation.