Slow Dynamics and Structure of Supercooled Water in Confinement

Abstract

Abstract:We review our simulation results on properties of supercooled confined water. We consider two situations: water confined in a hydrophilic pore that mimics an MCM-41 environment and water at interface with a protein. The behavior upon cooling of the α relaxation of water in both environments is well interpreted in terms of the Mode Coupling Theory of glassy dynamics. Moreover, we find a crossover from a fragile to a strong regime. We relate this crossover to the crossing of the Widom line emanating from the liquid-liquid critical point, and in confinement we connect this crossover also to a crossover of the two body excess entropy of water upon cooling. Hydration water exhibits a second, distinctly slower relaxation caused by its dynamical coupling with the protein.The crossover upon cooling of this long relaxation is related to the protein dynamics.

Modeling of Strain Actuation on Relatively Soft Curved Beams by Piezoelectric Ceramics for De-Icing Systems

“…If the temperatures of the clouds range from 0 to −20 • C, super-cooled water can exist, even in many g/m 3 . Under these conditions, when the droplets impact the surfaces of the aircraft structures they immediately freeze on the skin, thereby promoting ice formation and growth [11][12][13].…”

Nonequilibrium Phenomena in Confined Systems

“…A comparison between biological and inorganic confinement is provided in the contribution by G. Camisasca, M. De Marzio, M. Rovere and P. Gallo [7]. The authors perform numerical simulations in two situations: water confined in a hydrophilic pore that mimics an MCM-41 (inorganic) environment and water at interface with a protein.…”