Behrens, Claus Flensted

English

The frequency–dependent heat capacity of super-cooled glycerol near the glass transition is measured using the 3w detection technique. An electrical conducting thin film with a temperature–dependent electrical resistance is deposited on a substrate. The thin film is used simultaneously as a heater and as a thermometer. The aim of the work is to improve and understand this planar heater experiment. I find: • Carbon has advantages as heater material over the traditionally used metal (nickel) heaters. • The thermal coupling to the surrounding temperature bath should not be made through the liquid but through the substrate. • Edge effects, as a result of the finite size of the heater, play an important role. The traditionally way of dealing with these effects are not entirely correct. • The Cole–Davidson function with bC

Roskilde Universitet

Frequency-dependent heat capacity:experimental work to improve and understand planar heater experiments using the 3[omega] detection technique

https://forskning.ruc.dk/files/57415758/thesis.pdf

Frequency-dependent heat capacity:experimental work to improve and understand planar heater experiments using the 3[omega] detection technique

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Roskilde Universitet