title: Hydration-dependent dynamics of deeply cooled water under strong confinement.
abstract: We have measured the hydration-level dependence of the single-particle dynamics of water confined in the ordered mesoporous silica MCM-41. The dynamic crossover observed at full hydration is absent at monolayer hydration. The monolayer dynamics are significantly slower than those of water in a fully hydrated pore at ambient temperatures. At low temperatures, the opposite is found to be true. These results underscore the importance of water's tetrahedral hydrogen-bond network in accounting for its low temperature dynamic properties.
authors.affiliation: Department of Nuclear Science & Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: C E
authors.initials: CE
authors.lastname: Bertrand
authors.forename: K-H
authors.initials: KH
authors.lastname: Liu
authors.forename: E
authors.initials: E
authors.lastname: Mamontov
authors.forename: S-H
authors.initials: SH
authors.lastname: Chen