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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Pickering phase change slurries.

Sepehr Saber1, Mohammad Zargartalebi1, Amin Kazemi1

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.

Journal of Colloid and Interface Science
|August 19, 2023
PubMed
Summary
This summary is machine-generated.

Tuning salinity and temperature enhances the stability of Pickering phase change slurries (PPCS) stabilized by silica nanoparticles. These stable PPCS formulations resist shear and extreme conditions, improving energy applications.

Keywords:
E-DLVOFlocculationPhase change slurryPickering emulsionsRheology

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Phase change slurries (PCS) are promising for energy applications but suffer from stability issues.
  • Pickering phase change slurries (PPCS), stabilized by nanoparticles, offer a potential solution for enhanced stability.

Purpose of the Study:

  • To investigate the impact of salinity and temperature on the stability of nanoparticle-stabilized PPCS.
  • To identify optimal environmental variables for designing stable PPCS formulations.

Main Methods:

  • Developed paraffin-based PPCS using fumed silica nanoparticles.
  • Assessed stability under varying NaCl concentrations and temperatures.
  • Utilized Extended-DLVO modeling, microscopy, and rheological experiments.

Main Results:

  • Increased salinity enhanced network formation and shear stability without altering nanoparticle packing density.
  • A critical volume fraction of 0.51 was identified for significant viscosity increase.
  • Formulations demonstrated stability under high pressure and temperature, irrespective of salinity.

Conclusions:

  • Salinity and temperature are key variables for tuning PPCS stability.
  • Stable PPCS formulations can be designed for diverse energy applications by controlling these parameters.