Thermal characterization of liquid and solid samples using a measurement platform for the bidirectional 3-omega method

Corinna Grosse (Corresponding author), Mohamad Abo Ras, Aapo Varpula, Kestutis Grigoras, Daniel May, Bernhard Wunderle, Mika Prunnila

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific


    Measuring the thermal conductivity can be challenging, especially for liquids or pastes of small volumes. We developed a measurement chip which is suitable for a rapid, accurate and convenient determination of the thermal conductivity and diffusivity of droplet size specimens [1]. The measurement method is based on an extension of the 3-omega measurement technique, the so-called bidirectional 3-omega method [1,2]. We designed and fabricated a characterization chip with through-glass vias allowing for the measurement of small samples, a convenient sample positioning and optical inspection of the sample during measurement. A very thin passivation layer, fabricated by atomic layer deposition, enables measuring electrically conductive samples while maintaining good thermal transport through the passivation layer. Sample volumes down to 0.02 mm³ are sufficient for accurate measurements. The measurements can be performed within few minutes. Measurements of the thermal conductivity of different thermal interface materials, for example, pastes and pads, and several liquids and polymers, were performed and the results are compared to those obtained using a standard steady-state technique and literature values. The results obtained with both methods agree well showing that the bidirectional 3-omega method is suitable for the thermal characterization of such samples.
    Original languageEnglish
    Title of host publicationBook of abstracts. Nanoscale and Microscale Heat Transfer VI
    Subtitle of host publicationEurotherm seminar No 111
    Publication statusPublished - 5 Dec 2018
    MoE publication typeNot Eligible
    EventNanoscale and Microscale Heat Transfer VI, NMHT-VI : Eurotherm seminar No 111 - Levi, Kittilä, Finland
    Duration: 2 Dec 20187 Dec 2018
    Conference number: 6


    ConferenceNanoscale and Microscale Heat Transfer VI, NMHT-VI
    Abbreviated titleNMHT-VI


    • OtaNano


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