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This study developed new eutectic phase change materials (ePCMs) for passive thermal control around 4°C. Enhancing thermal conductivity with nanomaterials like SWCNTs offers improved performance for cold energy storage applications.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Chemical Engineering

Background:

  • Cold thermal energy storage is crucial for passive thermal protection.
  • Eutectic phase change materials (ePCMs) offer automatic temperature control without external systems.
  • Developing ePCMs with specific properties is essential for efficient energy storage.

Purpose of the Study:

  • To synthesize and characterize novel eutectic phase change materials (ePCMs) based on n-alkanes for passive temperature control around 4°C.
  • To investigate solid-liquid-liquid equilibrium (SLLE) phase diagrams for binary systems involving n-alkanes and diols.
  • To analyze methods for predicting ePCM properties and enhance their thermal conductivity using nanomaterials.

Main Methods:

  • Investigation of solid-liquid equilibrium (SLE) in binary n-alkane systems.
  • Determination of solid-liquid-liquid equilibrium (SLLE) phase diagrams.
  • Differential Scanning Calorimetry (DSC) for thermal analysis.
  • Density and dynamic viscosity measurements.
  • Preparation and testing of ePCM-nanomaterial composites (SWCNTs, GIC, EG).

Main Results:

  • Three eutectic phase change materials (ePCMs) were identified, with two exhibiting high enthalpies (approx. 220 J/g).
  • Two SLLE phase diagrams were successfully determined.
  • Predictive models for eutectic parameters and melting enthalpy were validated.
  • ePCM composites with 1 wt% Single Wall Carbon Nanotubes (SWCNTs) showed significantly enhanced thermal conductivity and stability.

Conclusions:

  • Novel n-alkane based ePCMs operating around 4°C were successfully developed.
  • The study provides a framework for designing ePCMs and validating predictive models.
  • Incorporation of SWCNTs into ePCMs is a viable strategy to improve thermal conductivity for cold energy storage applications.