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Characterizing the Thermal Diffusivity of Single, Micrometer-Sized Fibers via High-Resolution Lock-In Thermography

  • Thomas Tran
    Thomas Tran
    Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
    More by Thomas Tran
  • Charly Kodisch
    Charly Kodisch
    Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
  • Marius Schöttle
    Marius Schöttle
    Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
  • Nelson W. Pech-May*
    Nelson W. Pech-May
    Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
    *Email: [email protected]
  • , and 
  • Markus Retsch*
    Markus Retsch
    Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
    Bavarian Polymer Institute, Bayreuth Center for Colloids and Interfaces, and Bavarian Center for Battery Technology (BayBatt), University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
    *Email: [email protected]
Cite this: J. Phys. Chem. C 2022, 126, 32, 14003–14010
Publication Date (Web):August 5, 2022
https://doi.org/10.1021/acs.jpcc.2c04254
Copyright © 2022 The Authors. Published by American Chemical Society

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    Abstract

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    Many advanced materials consist of fibers. They are used as nonwovens, fabrics, or in composite materials. Characterization of individual fibers allows us to predict resulting material properties. We present a measurement setup and analysis software to characterize individual, micrometer-sized fibers fast and reliably. The setup is based on the lock-in thermography principle. Thermal diffusivity values of seven reference samples agree very well with previously reported values. We use our setup to investigate critical measurement parameters like excitation frequency, excitation power, pixel size, and fiber orientation. Our results show that fibers with subpixel diameters can be measured even if they are not aligned. However, special care has to be taken to choose an adequate excitation power. Measurements at high intensities can underestimate thermal diffusivity even though the raw data looks reasonable. By automatically measuring at different excitation powers, our setup solves this issue.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpcc.2c04254.

    • Overview of used materials, workflow flowchart, images of samples, duty cycle evaluation, additional raw data, and laser characterization (PDF)

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