Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session P47: Recent Advances in Energy Conversion Devices
2:30 PM–5:18 PM,
Wednesday, March 6, 2019
BCEC
Room: 213
Sponsoring
Unit:
GERA
Chair: Jeffrey Owrutsky, United States Naval Research Laboratory
Abstract: P47.00005 : Maximum Thermal Insulation by Nanoporous, Particulate Materials*
3:18 PM–3:30 PM
Presenter:
Markus Retsch
(Department of Chemistry, University of Bayreuth, 95444 Bayreuth, Germany)
Authors:
Pia Ruckdeschel
(Department of Chemistry, University of Bayreuth, 95444 Bayreuth, Germany)
Alexandra Philipp
(Department of Chemistry, University of Bayreuth, 95444 Bayreuth, Germany)
Markus Retsch
(Department of Chemistry, University of Bayreuth, 95444 Bayreuth, Germany)
In this contribution, we use structurally well-defined hollow silica nanoparticles to elaborate the minimum thermal conductivity achievable with this sort of particulate material. The use of monodisperse hollow silica nanoparticles offers several benefits: precise adjustment of open and closed pore volume, the independent variation of the density, and control over particle contact points.
By adjusting the structural properties, we find a minimum thermal conductivity to be reached at ~ 35 mWm-1K-1 in air, whereas 7 mWm-1K-1 can be achieved in vacuum. Thus, tailor-made particle ensembles based on hollow silica nanoparticles represent a dispersion processable, breathable, and non-flammable alternative to common polymer foams.
*This project was funded by a Lichtenberg Professorship provided by the Volkswagen Foundation. Additional support was provided by the Bavarian Polymer Institute, BPI, the SFB840, and DFG project RE3550/2-1
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