Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Tunable Thermoelastic Anisotropy in Hybrid Bragg Stacks with Extreme Polymer Confinement

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. Vol. 132 (2020) Issue 3 . - pp. 1302-1310.
ISSN 1521-3757
DOI: https://doi.org/10.1002/ange.201911546

Abstract in another language

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
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 > 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)
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 09 Jan 2020 08:02
Last Modified: 09 Jan 2020 08:02
URI: https://eref.uni-bayreuth.de/id/eprint/53695