Highly Stable and Conductive Microcapsules for Enhancement of Joule Heating Performance

Zheng, Zhaoliang; Jin, Jidong; Xu, Guang-Kui; Zou, Jianli; Wais, Ulrike; Beckett, Alison; Heil, Tobias; Higgins, Sean; Guan, Lunhui; Wang, Ying; Shchukin, Dmitry

Abstract

Nanocarbons show great promise for establishing the next generation of Joule heating systems, but suffer from the limited maximum temperature due to precociously convective heat dissipation from electrothermal system to surrounding environment. Here we introduce a strategy to eliminate such convective heat transfer by inserting highly stable and conductive microcapsules into the electrothermal structures. The microcapsule is composed of encapsulated long-chain alkanes and graphene oxide/carbon nanotube hybrids as core and shell material, respectively. Multiform carbon nanotubes in the microspheres stabilize the capsule shell to resist volume-change-induced rupture during repeated heating/cooling process, and meanwhile enhance the thermal conductance of encapsulated alkanes which facilitates an expeditious heat exchange. The resulting microcapsules can be homogeneously incorporated in the nanocarbon-based electrothermal structures. At a dopant of 5%, the working temperature can be enhanced by 30% even at a low voltage and moderate temperature, which indicates a great value in daily household applications. Therefore, the stable and conductive microcapsule may serve as a versatile and valuable dopant for varieties of heat generation systems.

Citation

Zheng, Z., Jin, J., Xu, G., Zou, J., Wais, U., Beckett, A., …Shchukin, D. (2016). Highly Stable and Conductive Microcapsules for Enhancement of Joule Heating Performance. ACS Nano, 10(4), 4695-4703. https://doi.org/10.1021/acsnano.6b01104

• Journal Article Type: Article
• Acceptance Date: Mar 22, 2016
• Online Publication Date: Mar 22, 2016
• Publication Date: Apr 26, 2016
• Deposit Date: May 31, 2017
• Publicly Available Date: May 25, 2018
• Journal: ACS Nano
• Print ISSN: 1936-0851
• Electronic ISSN: 1936-086X
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Issue: 4
• Pages: 4695-4703
• DOI: https://doi.org/10.1021/acsnano.6b01104