Investigation of supercooled water dynamics by confinement in dense microgel suspensions
A way to avoid water crystallization and to access the so-called no man's land is to confine water in complex environments. We recently discovered that dense colloidal microgels act as efficient confining media, which are able to prevent water crystallization at any temperature. In previous neutron scattering experiments of microgels in D2O combined with molecular dynamics simulations, we detected the occurrence of a dynamical transition in the mobility of polymers, analogous to that observed in proteins, at a temperature T~250K. Simulations further showed that there is a strong coupling between polymer and water degrees of freedom. Indeed, water diffusion constant undergoes a clear discontinuity at the same temperature. We now propose to extend the neutron scattering investigations to water by studying deuterated microgels in H2O, aiming to verify the existence of the dynamical transition in water and to further explore water dynamics in the deeply supercooled regime.
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TAVAGNACCO Letizia; BERTOLDO Monica; BURATTI Elena; CAMERIN Fabrizio; Bernhard Frick; OLLIVIER Jacques; ORECCHINI Andrea; TOZZI Pietro; ZACCARELLI Emanuela and M. Zanatta. (2018). Investigation of supercooled water dynamics by confinement in dense microgel suspensions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1864
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