6533b830fe1ef96bd1296562
RESEARCH PRODUCT
Dynamic anomalies at the glass transition of organic van der Waals liquids
F. Fujarasubject
Self-diffusionCondensed matter physicsOrganic ChemistryNeutron scatteringCondensed Matter::Disordered Systems and Neural NetworksAnalytical ChemistryCondensed Matter::Soft Condensed MatterInorganic Chemistrychemistry.chemical_compoundViscositysymbols.namesakechemistryTerphenylsymbolsPhysics::Chemical PhysicsAnomaly (physics)Debye–Waller factorvan der Waals forceGlass transitionSpectroscopydescription
Abstract The paper discusses the question of whether there is a characteristic temperature T c above the calorimetric glass transition temperature T g . Mode-coupling theory (MCT) predicts a crossover from liquid- to solid-like dynamics at T c . Neutron scattering and gradient NMR experiments have been carried out to test MCT using the molecular van der Waals liquid ortho -terphenyl as a model system. A significant anomaly of the Debye—Waller factor and a “decoupling” of self-diffusion from viscosity support the MCT predictions. A critical discussion of the relevance of such tests and of the limitations of neutron scattering is presented.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-08-01 | Journal of Molecular Structure |