Direct Measurement of the In-Plane Thermal Diffusivity of Semitransparent Thin Films by Lock-In Thermography : An Extension of the Slopes Method

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00006422
URN to cite this document: urn:nbn:de:bvb:703-epub-6422-6

Title data

Philipp, Alexandra ; Pech-May, Nelson W. ; Kopera, Bernd A. F. ; Lechner, Anna M. ; Rosenfeldt, Sabine ; Retsch, Markus:
Direct Measurement of the In-Plane Thermal Diffusivity of Semitransparent Thin Films by Lock-In Thermography : An Extension of the Slopes Method.
In: Analytical Chemistry. Vol. 91 (2019) Issue 13 . - pp. 8476-8483.
ISSN 1520-6882
DOI der Verlagsversion: https://doi.org/10.1021/acs.analchem.9b01583

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Abstract

We present an extension of the well-known slopes method for characterization of the in-plane thermal diffusivity of semitransparent polymer films. We introduce a theoretical model which considers heat losses due to convection and radiation mechanisms, as well as semitransparency of the material to the exciting laser heat source (visible range) and multiple reflections at the film surfaces. Most importantly, a potential semitransparency of the material in the IR detection range is also considered. We prove by numerical simulations and by an asymptotic expansion of the surface temperature that the slopes method is also valid for any semitransparent film in the thermally thin regime. Measurements of the in-plane thermal diffusivity performed on semitransparent polymer films covering a wide range of absorption coefficients (to the exciting wavelength and in the IR detection range of our IR camera) validate our theoretical findings.

Further data

Item Type:	Article in a journal
Keywords:	lock-in thermography; method development; semi-transparent thin films; thermal conductivity
DDC Subjects:	500 Science > 540 Chemistry
Institutions of the University:	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 - Kolloidale Strukturen und Energiematerialien Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I - Kolloidale Strukturen und Energiematerialien > Chair Physical Chemistry I- Kolloidale Strukturen und Energiematerialien - Univ.-Prof. Dr. Markus Retsch Profile Fields > Advanced Fields > Polymer and Colloid Science Profile Fields > Advanced Fields > Advanced Materials Research Institutions > Central research institutes > Bayreuth Institute of Macromolecular Research - BIMF Research Institutions > Central research institutes > Bayreuth Center for Colloids and Interfaces - BZKG Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI) Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie Research Institutions > EU Research Projects > VISIRday Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Profile Fields Profile Fields > Advanced Fields Research Institutions Research Institutions > Central research institutes Research Institutions > Affiliated Institutes Research Institutions > Collaborative Research Centers, Research Unit Research Institutions > EU Research Projects
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-6422-6
Date Deposited:	23 Jun 2022 06:17
Last Modified:	23 Jun 2022 06:28
URI:	https://epub.uni-bayreuth.de/id/eprint/6422

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