Molecular dynamics simulations of supercooled water confined in a silica nanopore of MCM-41 type have been performed down to T=200 K. We find evidence of a fragile-to-strong dynamic crossover transition at a temperature T=220 K, close to the experimental finding. This crossover has been localized by looking at the diffusion coefficient behavior that shows a crossover point from a non-Arrhenius to an Arrhenius behavior. We also analyze the glassy behavior of the mean square displacement and of the self intermediate scattering function upon crossing the dynamic crossover. We discuss the results on the framework of a physical picture of a fragile high density liquid that evolves to a strong low density liquid upon approaching the glass transition temperature.

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1. Thermodynamics of supercooled water in solutions and in confinement