The 3ω technique has become a popular method for determining the thermophysical properties of microscale and bulk materials. The prerequisite fabrication of a highly linear metal line a few hundred nanometers thick on the sample can be a failing point in specific material systems. This difficulty can be overcome by utilizing a bidirectional experimental geometry that employs a contact resistance between the sample and heating wire, which also allows for data collection under varying axial pressure loads. In this work, such a system is demonstrated with an emphasis on developing a thermal mount that will optimize sensitivity to the thermophysical parameters of interest: the sample's thermal conductivity, volumetric heat capacity, and the contact resistance between the sample and mount. A general thermal model is presented that can be simplified to analyze nearly any similar system. This model is then employed to analyze a sample in the mounting scheme described with varying applied pressures to demonstrate the general feasibility of the system.
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June 2014
Research Article|
June 26 2014
General bidirectional thermal characterization via the 3ω technique
Matthew L. Bauer;
Matthew L. Bauer
a)
Department of Mechanical and Aerospace Engineering,
University of Virginia
, Charlottesville, Virginia 22904, USA
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Pamela M. Norris
Pamela M. Norris
Department of Mechanical and Aerospace Engineering,
University of Virginia
, Charlottesville, Virginia 22904, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: bauer@virginia.edu
Rev Sci Instrum 85, 064903 (2014)
Article history
Received:
April 07 2014
Accepted:
June 09 2014
Citation
Matthew L. Bauer, Pamela M. Norris; General bidirectional thermal characterization via the 3ω technique. Rev Sci Instrum 1 June 2014; 85 (6): 064903. https://doi.org/10.1063/1.4884638
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