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

	Format: PDF Name: anie.201911546.pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
	Download (3MB)

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 - Kolloidale Strukturen und Energiematerialien > Chair Physical Chemistry I- Kolloidale Strukturen und Energiematerialien - Univ.-Prof. Dr. Markus Retsch Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Colloids for Electrochemical Energy storage > Chair Chair Inorganic Colloids for Electrochemical Energy storage - 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 - Kolloidale Strukturen und Energiematerialien Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Colloids for Electrochemical Energy storage 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

Download Statistics

Download Statistics

Download Statistics

Downloads

Downloads per month over past year