6533b7d8fe1ef96bd126b5da
RESEARCH PRODUCT
Translational and rotational molecular motion in supercooled liquids studied by NMR and forced Rayleigh scattering
B. GeilHans SillescuG. HeubergerI. ChangF. FujaraT. Mangelsubject
ChemistryRotation around a fixed axisRotational diffusionDecoupling (cosmology)Condensed Matter PhysicsMolecular physicsElectronic Optical and Magnetic Materialssymbols.namesakeMaterials ChemistryCeramics and CompositessymbolsMolecular motionPhysical chemistryvan der Waals forceDiffusion (business)SupercoolingGlass transitiondescription
It has been shown that translational diffusion coefficients, Dt, in the supercooled van der Waals liquids, orthoterphenyl, phenolphthaleindimethylether, and salol, have a weaker temperature dependence than the shear viscosity, η, at T ≲ 1.2Tg and can be described by Dt ∼ η−χ with χ < 1 whereas Dr ∼ η−1 applies for the mean rotational diffusion coefficients, Dr, down to the glass transition temperature, Tg. This apparent decoupling of translational and rotational motion has been discussed in relation with possible anomalous short time diffusion, spatial heterogeneity, and cooperative molecular motions close to Tg.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-09-01 | Journal of Non-Crystalline Solids |