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Related Concept Videos

Accelerating Fluids01:17

Accelerating Fluids

When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:

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High-Performance Ionanofluids from Subzipped Carbon Nanotube Networks.

Marzena Dzida1, Sławomir Boncel2,3, Bertrand Jóźwiak2,4

  • 1Institute of Chemistry, University of Silesia in Katowice, Szkolna 9, Katowice 40-006, Poland.

ACS Applied Materials & Interfaces
|November 4, 2022
PubMed
Summary
This summary is machine-generated.

Ionanofluids with multiwalled carbon nanotubes (MWCNTs) and ionic liquids (ILs) show enhanced thermal conductivity. Nanotube structure and IL interactions create 3D networks, improving heat transfer for advanced applications.

Keywords:
ionanofluidssubzipping mechanismthermal conductivityviscosity“cobra-like” macromolecular architectures

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Investments in thermal energy storage and renewable energy are crucial for economic infrastructure and post-COVID recovery.
  • Ionanofluids (INFs), combining multiwalled carbon nanotubes (MWCNTs) and ionic liquids (ILs), offer enhanced thermal conductivity, stability, and rheology.
  • The precise mechanisms of heat transfer and rheology in INFs, influenced by nanoparticle morphology and IL interactions, require further elucidation.

Purpose of the Study:

  • To investigate the influence of MWCNT morphology, physicochemistry, and IL-nanostructure interactions on INF heat transfer and rheological properties.
  • To elucidate the mechanism behind the thermal conductivity enhancement in INFs.
  • To provide a detailed description of the IL-CNT interface and the molecular structure of the continuous phase in INFs.

Main Methods:

  • Characterization of MWCNT-IL interactions using advanced analytical techniques.
  • Analysis of nanolayer coalescence and 1D geometry assembly in MWCNT bundles.
  • Investigation of covalent interactions between broken nanotubes and IL cations.
  • Study of anion conformation changes due to MWCNT surface proximity.

Main Results:

  • Ultrasonication induced MWCNT bundle 'zipping' and formation of 3D thermal bridge networks.
  • Stable networks of MWCNTs with ionic layers at junctions were identified.
  • Covalent interactions were observed between broken nanotubes and IL cations.
  • Proximity of MWCNT surfaces promoted the enrichment of the cis conformer of the bis(trifluoromethylsulfonyl)imide anion.

Conclusions:

  • The molecular perfection and supramolecular arrangement of MWCNTs significantly enhance INF thermal conductivity.
  • A detailed understanding of IL-CNT interface interactions and continuous phase structure was achieved.
  • These findings pave the way for designing more efficient heat-transfer fluids and miniaturized flexible electronics.