The contribution of small angle and quasi-elastic scattering to the physics of liquid water

3rd International Conference on Small Angle Neutron Scattering dedicated to the 80 anniversary of Yu.M. Ostanevich

Teixeira, José^1

Laboratoire Léon Brillouin (CEA/CNRS), CEA Saclay, Gif-sur-Yvette Cedex

F-91191, France^1

关键词: Homogeneous nucleation temperature;    Hydrogen bond dynamics;    Isothermal compressibility;    Liquid-liquid transition;    Quasi elastic neutron scattering;    Quasielastic scattering;    Small angle x-rays;    Temperature and pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/848/1/012003/pdf
DOI  :  10.1088/1742-6596/848/1/012003

来源: IOP

【 摘 要 】

Many properties of liquid water at low temperature show anomalous behaviour. For example, density, isothermal compressibility, heat capacity pass by maxima or minima and transport properties show a super-Arrhenius behaviour. Extrapolations performed beyond the homogeneous nucleation temperature are at the origin of models that predict critical points, liquid-liquid transitions or dynamic cross-overs in the large domain of temperature and pressure not accessible to experiments because of ice nucleation. A careful analysis of existing data can be used to test some of these models. Small angle X-ray or neutron scattering data are incompatible with models where two liquids or heterogeneities are present. Quasi-elastic neutron scattering, taking advantage and combining both coherent and incoherent scattering show that two relaxation times are present in liquid water and that one of them, related to hydrogen bond dynamics, has an Arrhenian behaviour, suggesting that the associated dynamics of the bonds, similar to the β relaxation of polymers, determines the glass transition temperature of water.