Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-09-26
Physical Review E, 81, 061505, 2010
Physics
Condensed Matter
Soft Condensed Matter
17 pages, 15 figures, Substantially revised version
Scientific paper
10.1103/PhysRevE.81.061505
We present a novel method of measuring the frequency dependent specific heat at the glass transition applied to 5-polyphenyl-4-ether. The method employs thermal waves effusing radially out from the surface of a spherical thermistor that acts as both a heat generator and thermometer. It is a merit of the method compared to planar effusion methods that the influence of the mechanical boundary conditions are analytically known. This implies that it is the longitudinal rather than the isobaric specific heat that is measured. As another merit the thermal conductivity and specific heat can be found independently. The method has highest sensitivity at a frequency where the thermal diffusion length is comparable to the radius of the heat generator. This limits in practise the frequency range to 2-3 decades. An account of the 3omega-technique used including higher order terms in the temperature dependency of the thermistor and in the power generated is furthermore given.
Christensen Tage
Jakobsen Bo
Olsen Niels Boye
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