BIBLIOS

Document type
Conference papers

Document subtype
Abstract

Title
Subzipping of long multi-walled carbon nanotube networks in ionic liquid: on the route to thermal and rheological excellence of ioNanofluids

Participants in the publication
Marzena Dzida (Author)
Sławomir Boncel (Author)
Bertrand Jóźwiak (Author)
Heather F. Greer (Author)
Mateusz Dulski (Author)
Adrian Golba (Author)
Rafał Flamholc (Author)
Grzegorz Dzido (Author)
Justyna Dziadosz (Author)
Anna Kolanowska (Author)
Rafał Jędrysiak (Author)
Łukasz Scheller (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
Ionanofluids (INFs) – composed of multi-walled carbon nanotubes (MWCNTs) and ionic liquids (ILs) – are systems characterized by improved thermal conductivity, non-flammability, high stability, which can lead to efficient and safe heat transfer media. We present structural and spectroscopic studies (including cryo-transmission electron microscopy and Raman spectroscopy, respectively) as well as molecular dynamics simulations correlated with excellent thermal conductivity enhancements (40%) in thermal conductivity of 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide-based INFs with C-sp2 rich, long, crystalline MWCNTs [1]. We found the subzipping of long multi-walled carbon nanotube networks in IL as a result of interactions between two neighboring nanotubes which fragmentarily coalescent by the IL nanolayers, i.e. intertube zipping together with locally unzipped individual pairs of nanotubes and/or longitudinally unzipped nanotubes. \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nThis effect leads to formation of thermal bridges towards 3D networks in the whole INF volume. Additionally, the energy of CNTs walls–IL interaction obtained from molecular dynamics simulations indicated that the formation of CNT networks, separated by a layer of IL ions is a thermodynamically favorable process. In turn, the correlation between the integrated intensity ratios of Raman spectra suggests the formation of the new covalent bonds between the broken nanotube and, most probably, the IL cation. Thus, the molecular perfection of the MWCNT structure with its supramolecular arrangement and the MWCNT-IL interactions affect extraordinary thermal conductivity enhancement and optimal rheological characteristics.\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\n

Editor(s)
INSA, Lyon


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Event
COIL-9, Lyon, France, April 24-28, 2023

Publication Identifiers

Address
Lyon, France

Organizers
INSA, Lyon and CNRS