title: High-resolution inelastic neutron scattering from water in mesoporous silica.
abstract: High-resolution inelastic neutron scattering measurements of the molecular dynamics of water confined to a porous host, the molecular sieve known as MCM-41, which has a hexagonal array of parallel pores with average pore diameter of 27 A, are reported. Previous neutron measurements probing higher-energy transfers, and thus shorter time scales, have been analyzed with both a rotation-translation diffusion model and a stretched exponential intermediate scattering function. The dynamics on longer time scales presented here are modeled well with a stretched exponential relaxation in a confining geometry. The observed molecular dynamics of water are three orders of magnitude slower than has been previously reported for water confined in MCM-41.
authors.affiliation: Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: F
authors.initials: F
authors.lastname: Mansour
authors.forename: R M
authors.initials: RM
authors.lastname: Dimeo
authors.forename: H
authors.initials: H
authors.lastname: Peemoeller