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

Title data

Tran, Thomas ; Kodisch, Charly ; Schöttle, Marius ; Pech-May, Nelson W. ; Retsch, Markus:
Characterizing the Thermal Diffusivity of Single, Micrometer-Sized Fibers via High-Resolution Lock-In Thermography.
In: The Journal of Physical Chemistry C. Vol. 126 (2022) Issue 32 . - pp. 14003-14010.
ISSN 1932-7455
DOI: https://doi.org/10.1021/acs.jpcc.2c04254

Official URL: Volltext

Project information

Project financing: Andere

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I > Chair Physical Chemistry I - Univ.-Prof. Dr. Markus Retsch
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Nov 2022 08:53
Last Modified: 03 Nov 2022 08:53
URI: https://eref.uni-bayreuth.de/id/eprint/72638