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Conventional methods fail to measure c_p(omega) of glass-forming liquids

Tage Christensen·Niels Boye Olsen·Jeppe C. Dyre
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Abstract

The specific heat is frequency dependent in highly viscous liquids. By solving the full one-dimensional thermo-viscoelastic problem analytically it is shown that, because of thermal expansion and the fact that mechanical stresses relax on the same time scale as the enthalpy relaxes, the plane thermal-wave method does not measure the isobaric frequency-dependent specific heat c_p(omega). This method rather measures a "longitudinal" frequency-dependent specific heat, a quantity defined and detailed here that is in-between c_p(omega) and c_v(omega). This result means that no wide-frequency measurements of c_p(omega) on liquids approaching the calorimetric glass transition exist. We briefly discuss consequences for experiment.

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Tage Christensen, Niels Boye Olsen, Jeppe C. Dyre. 2007-04-18. Conventional methods fail to measure c_p(omega) of glass-forming liquids. https://doi.org/10.1103/physreve.75.041502

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