BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
High-Performance Ionanofluids from Subzipped Carbon Nanotube Networks

Participants in the publication
Marzena Dzida (Author)
Sławomir Boncel (Author)
Bertrand Jóźwiak (Author)
Heather F. Greer (Author)
Mateusz Dulski (Author)
Łukasz Scheller (Author)
Adrian Golba (Author)
Rafał Flamholc (Author)
Grzegorz Dzido (Author)
Justyna Dziadosz (Author)
Anna Kolanowska (Author)
Rafał Jędrysiak (Author)
Anna Blacha (Author)
Krzysztof Cwynar (Author)
Edward Zorębski (Author)
Carlos E.S. Bernardes (Author)
Dep. Química e Bioquímica
CQE
Maria José V. Lourenço (Author)
Dep. Química e Bioquímica
CQE
Carlos A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE

Summary
Investments in the transfer and storage of thermal energy along with renewable energy sources strengthen health and economic infrastructure. These factors intensify energy diversification and the more rapid post-COVID recovery of economies. Ionanofluids composed of long multi-walled carbon nanotubes (MWCNTs) rich in sp2-hybridized atoms and ionic liquids (ILs) display excellent thermal conductivity enhancements with respect to pure IL, high thermal stability and attractive rheology. However, influence of the morphology and physicochemistry of nanoparticles and the IL-nanostructure interactions on the mechanism of heat transfer and rheological properties of ionanofluids remain unidentified. Here, we show that intertube nanolayer coalescence, supported by 1D geometry assembly, leads to the subzipping of MWCNT bundles and formation of thermal bridges towards 3D networks in the whole ionanofluid volume. We identified stable networks of straight and bent MWCNTs separated by a layer of ions at the junctions. We found that the interactions between the ultrasonication-induced breaking nanotube and the cations were covalent in nature. Furthermore, we found that the ionic layer imposed by close MWCNT surfaces favored enrichment of the cis conformer of the bis(trifluoromethylsulfonyl)imide anion. Our results demonstrate how molecular perfection of the MWCNT structure with its supramolecular arrangement affects extraordinary thermal conductivity enhancement of ionanofluids. Thus, we gave the realistic description of the interactions at the IL-CNT interface with its (super)structure and chemistry as well as the molecular structure of the continuous phase. We anticipate our results to be a starting point for more complex studies on the supramolecular zipping mechanism. For example, ionically functionalized MWCNTs toward polyionic systems – of projected and controlled nanolayers – could enable design of even more efficient heat transfer fluids and miniaturization of flexible electronics.

Editor(s)
Kirk Schanze


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
ACS Applied Materials & Interfaces

Publication Identifiers
ISSN - 1944-8244

Address
Whashingto, USA

Publisher
American Chemical Society (ACS)



Document Identifiers
DOI - https://doi.org/10.1021/acsami.2c14057
URL - http://dx.doi.org/10.1021/acsami.2c14057

Rankings
SCIMAGO Q1 (2021) - 2.143 (2021) - Nanoscience and Nanotechnology

Keywords
ionanofluids subzipping mechanism "cobra-like" macromolecular architectures thermal conductivity viscosity