What can we learn by squeezing a liquid?

Article Abstract:

The cooling dynamics of glass-forming liquids and polymers are studied. A liquid can be supercooled rapidly and effectively by squeezing and from the experiments conducted a three-parameter function is obtained that accurately fits [tau](T, [nu]) data for several glass-formers over the supercooled regime and no underlying transition needs to be invoked to interpret the slowing down of dynamics.

Polymers, Fluid dynamics

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Do theories of the glass transition, in which the structural relaxation time does not define the dispersion of the structural relaxation, need revision?

Article Abstract:

Experimental results for various glass formers is presented to show that the dispersion of the structural relaxation remains unchanged for widely different combinations of temperature and pressure, provided tau(sub alpha) is constant. The observation and the conclusions drawn are important consequences for studies of the glass transition and the dynamic properties of glass-forming materials.

Dispersion, Dispersion (Optics), Relaxation phenomena, Relaxation (Physics)

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Structural and secondary relaxations in supercooled Di-n-butyl phthalate and diisobutyl phthalate at levated pressure

Article Abstract:

The effect of molecular structure on the dynamical properties of supercooled di-n-butyl phthalate (DBP) and its isomer, diisobutyl phthalate (DiBP) is examined. The results of the dielectric alpha- and beta-relaxations and the ionic conductivity are discussed.

Supercooled liquids, Chemistry, Physical and theoretical, Physical chemistry, Phthalates

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