title: Diffusion and relaxation in interface layers of crystals in nanoporous glass.
abstract: Below the freezing point, experimental data provide evidence for the existence of a non-frozen interface layer (NFL) between the crystal in the pore and the pore walls. The molecules in this layer are effectively confined in a quasi-two-dimensional space that forces them to reorient when moving along the curved pore surface. Through this relaxation mechanism, the translational mobility in the unfrozen phase reveals itself in a pronounced frequency dependence of the spin-lattice relaxation time. The experimentally observed drop of the self-diffusion coefficients by more than one order of magnitude below the phase transition can be interpreted in terms of geometric restrictions as well as interactions with the surface.
authors.affiliation: Sektion Kernresonanzspektroskopie, Universität Ulm, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Zavada
authors.forename: S
authors.initials: S
authors.lastname: Stapf
authors.forename: R
authors.initials: R
authors.lastname: Kimmich
mesh_terms: D000473:Alkanes; D003460:Crystallization; D004058:Diffusion; D005898:Glass; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D016062:Porosity; D014867:Water
chemical_list: D000473:Alkanes; C024713:n-tetradecane; D014867:Water