Pressure dependence of MSD in supercooled confined water: a new way of testing the Liquid-Liquid Phase Transition hypothesis
Aim of this proposal is to verify the Liquid-Liquid Phase Transition (LLPT) hypothesis in supercooled confined water. The LLPT hypothesis has been recently proposed in the literature and has given rise to passionate debate; it has been suggested to be present in the hydration water of proteins and to trigger the so called protein dynamical transition. The novelty of our approach is in the use of Elastic Incoherent Neutron Scattering (EINS) to measure the pressure dependence of mean square displacements (MSD) at constant temperature, across the putative LLPT. Moreover, we investigate water confined in the pores of a hydrophilic disordered silica matrix obtained from the alcoxide precursor TMOS via the sol-gel method. In this new matrix the confinement conditions experienced by water in biological systems are closely mimicked and the hydration level can be easily varied.
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CUPANE Antonio; BARBIERI Liliana; FOMINA Margarita; OLLIVIER Jacques; PETERS Judith; PIAZZA Irina and SCHIRO Giorgio. (2014). Pressure dependence of MSD in supercooled confined water: a new way of testing the Liquid-Liquid Phase Transition hypothesis. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-13-522
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