Speaker
Prof.
Frédéric Caupin
(Université de Lyon and Institut Universitaire de France)
Description
The origin of water anomalies is an elusive mystery, but
recent experiments on supercooled water have revived the
hope to unravel it. For instance, surface tension has been
measured down to -25°C [1], and the structure factor of
micron-sized water droplets analyzed down to -44°C [2]. We
will review our recent work on metastable water. We have
used water inclusions in quartz crystals to reach negative
pressures in the -100 MPa range [3]. Brillouin light
scattering reveals anomalies in the sound velocity of water,
especially in the doubly metastable region where water is
both supercooled and under mechanical tension [4]. The new
data allows to construct an equation of state for water at
negative pressure [5]. The line of density maxima is
determined down to -120 MPa. Furthermore, extrema in
thermodynamic responses functions are detected. We will also
describe another set of experiments to measure the viscosity
of supercooled water at ambient and positive pressure [6].
[1] Hruby J. et al., J. Phys. Chem. Lett. 5, 425-428 (2014).
[2] Sellberg J. et al., Nature 510, 381-384 (2014).
[3] El Mekki Azouzi M., Ramboz C., Lenain J.-F. and Caupin
F., Nature Physics 9, 38-41 (2013).
[4] Pallares G et al., Proc. Natl. Acad. Sci. USA 111,
7936-7941 (2014).
[5] Pallares G et al., in preparation.
[6] Dehaoui A., Singh L.P., Issenmann B., and Caupin F., in
preparation.
Co-authors
Amine Dehaoui
(Université de Lyon)
Bruno Issenmann
(Université de Lyon)
Gaël Pallares
(Université de Lyon)
Lokendra Pratap Singh
(Université de Lyon)
