6533b7dafe1ef96bd126ea07
RESEARCH PRODUCT
Size Dependence of Tracer Diffusion in Supercooled Liquids
Hans SillescuGerhard Heubergersubject
ChemistryDiffusionGeneral EngineeringThermodynamicsPower lawPhysics::Fluid DynamicsCondensed Matter::Soft Condensed Mattersymbols.namesakeSuperposition principlechemistry.chemical_compoundsymbolsVan der Waals radiusPolystyrenePhysical and Theoretical ChemistrySupercoolingGlass transitionRotational correlation timedescription
We have determined by forced Rayleigh scattering the diffusion coefficients D of several photochromic tracers with van der Waals radii between 0.38 and 8 nm (the largest ones being photolabeled polystyrene micronetworks) in 10 glass-forming liquids at temperatures between the glass temperature Tg and ∼1.2Tg. The results were analyzed in terms of power law plots, D(T) ∝ T/η(T)ξ, where η is the solvent shear viscosity, and temperature shifts, D(T) ∝ T/η(T + ΔT). The shift ΔT was related with the width of the rotational correlation time distribution via the time−temperature superposition principle.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-01-01 | The Journal of Physical Chemistry |