title: Glassy dynamics in nanoconfinement as revealed by 31p NMR.
abstract: We investigated the glass former m-tricresyl-phosphate confined in different nanoporous silica matrices with defined pore radii from 2-150 nm. While applying different 31P NMR techniques, we were able to detect the extremely stretched correlation functions extending over 7-8 decades in time and reflecting strong dynamic heterogeneities. The experimental results were explained by a topological model for which the broad distribution of correlation times G(ln tau) becomes inhomogeneous in space; that is, the "local" dynamics given by a correlation time tau(r) depend on the distance from the pore center. As tau(r) changes with temperature, we were able to reintroduce the idea of a dynamic correlation length.
authors.forename: S
authors.initials: S
authors.lastname: Gradmann
authors.forename: P
authors.initials: P
authors.lastname: Medick
authors.forename: E A
authors.initials: EA
authors.lastname: Rössler