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Akihiro Orie, Junko Morikawa, Toshimasa Hashimoto
Thermochimica Acta, Volume 532, March 2012
Abstract
We have succeeded in developing a thermo-electric micro sensor designed with a three-dimensional electric wiring to measure the thermal diffusivity in micro scale. Temperature wave in the area of 12.5 μm in diameter is observed as a periodical change of thermo electromotive force. The phase shift of temperature wave is measured by means of a lock-in method and the thermal diffusivity of polymer film is determined with a standard deviation less than 2%. The micro-scale distribution of thermal diffusivity in the banded structures of spherulites of poly-l-lactic acid (PLLA) is demonstrated.
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