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Enhanced thermophysical properties via PAO superstructure.

Zahra Pournorouz1, Amirhossein Mostafavi1, Aditya Pinto1

  • 1Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX, 76019-0023, USA.

Nanoscale Research Letters
|January 13, 2017
PubMed
Summary

Scientists developed fabricated nano-additives to enhance heat capacity and thermal conductivity in engineering fluids like polyalphaolefin (PAO). This breakthrough mimics molten salt nanostructures, improving fluid performance for heat transfer applications.

Keywords:
Ethylen glycolHeat capacityNanofluidPAO (polyalphaolefin)Thermal conductivityViscosity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Fluid Dynamics

Background:

  • Molten salt nanomaterials show enhanced specific heat due to nanoparticle doping.
  • Enhancing specific heat in engineering fluids (oils, coolants) is crucial for engineering applications.
  • Existing nanoparticle doping in fluids like oil decreases specific heat, unlike molten salts.

Purpose of the Study:

  • To investigate the in situ formation of fabricated nano-additives to mimic nanostructures in molten salts.
  • To enhance the heat capacity, thermal conductivity, and viscosity of engineering fluids.
  • To evaluate the performance of these enhanced fluids for heat storage and transfer.

Main Methods:

  • Fabricated nano-additives with organic coatings were synthesized.
  • Polyalphaolefin (PAO) was doped with these nano-additives.
  • Differential scanning calorimetry (DSC), rheometry, and a custom setup were used for characterization.

Main Results:

  • A 44.5% increase in heat capacity was observed with 2% fabricated nanostructures in PAO.
  • Thermal conductivity and viscosity showed enhancements of 19.8% and 22.98%, respectively.
  • In situ nanostructure formation was confirmed by thermal cycling analysis.

Conclusions:

  • Fabricated nano-additives can successfully mimic molten salt nanostructures in engineering fluids.
  • This approach significantly enhances heat capacity and thermal conductivity, offering potential for improved heat transfer fluids.
  • The spontaneous in situ formation of nanostructures is key to the observed property enhancements.