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

Claus Flensted Behrens

    Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandling


    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 bCD
    ForlagRoskilde Universitet
    Antal sider176
    StatusUdgivet - 2004

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