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Tunable Thermoelastic Anisotropy in Hybrid Bragg Stacks with Extreme Polymer Confinement

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00004953
URN to cite this document: urn:nbn:de:bvb:703-epub-4953-0

Title data

Wang, Zuyuan ; Rolle, Konrad ; Schilling, Theresa ; Hummel, Patrick ; Philipp, Alexandra ; Kopera, Bernd A. F. ; Lechner, Anna M. ; Retsch, Markus ; Breu, Josef ; Fytas, George:
Tunable Thermoelastic Anisotropy in Hybrid Bragg Stacks with Extreme Polymer Confinement.
In: Angewandte Chemie International Edition. Vol. 59 (2020) Issue 3 . - pp. 1286-1294.
ISSN 1521-3773
DOI der Verlagsversion: https://doi.org/10.1002/anie.201911546

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Abstract

Controlling thermomechanical anisotropy is important for emerging heat management applications such as thermal interface and electronic packaging materials. Whereas many studies report on thermal transport in anisotropic nanocomposite materials, a fundamental understanding of the interplay between mechanical and thermal properties is missing, due to the lack of measurements of direction‐dependent mechanical properties. In this work, exceptionally coherent and transparent hybrid Bragg stacks made of strictly alternating mica‐type nanosheets (synthetic hectorite) and polymer layers (polyvinylpyrrolidone) were fabricated at large scale. Distinct from ordinary nanocomposites, these stacks display long‐range periodicity, which is tunable down to angstrom precision. A large thermal transport anisotropy (up to 38) is consequently observed, with the high in‐plane thermal conductivity (up to 5.7 W m−1 K−1) exhibiting an effective medium behavior. The unique hybrid material combined with advanced characterization techniques allows correlating the full elastic tensors to the direction‐dependent thermal conductivities. We, therefore, provide a first analysis on how the direction‐dependent Young's and shear moduli influence the flow of heat.

Further data

Item Type: Article in a journal
Additional notes (visible to public): auch in: Angewandte Chemie, 2020, vol. 132(3),S. 1302-1310; https://doi.org/10.1002/ange.201911546
DDC Subjects: 500 Science
500 Science > 530 Physics
500 Science > 540 Chemistry
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 > Chair Physical Chemistry I - Univ.-Prof. Dr. Markus Retsch
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Faculties
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 Inorganic Chemistry I
Research Institutions
Research Institutions > Affiliated Institutes
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-4953-0
Date Deposited: 22 Jul 2020 10:33
Last Modified: 22 Jul 2020 10:33
URI: https://epub.uni-bayreuth.de/id/eprint/4953

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