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Gallium-indium nanoparticles as phase change material additives for tunable thermal fluids
Jacob Mingear1, Zachary Farrell2, Darren Hartl3
1Department of Materials Science & Engineering, Texas A&M University, College Station, TX 77843, USA.
Nanoscale
|January 6, 2021
Summary
This study introduces Gallium-Indium alloy nanoparticles as a novel phase change material (PCM) slurry for advanced thermal management in electronics. These nanoparticles enhance thermal conductivity and offer tunable cooling capabilities for high-power applications.
Area of Science:
- Materials Science
- Nanotechnology
- Thermal Engineering
Background:
- Effective thermal management is crucial for high-power electronics.
- Current cooling methods using single-phase or dual-phase fluids have limitations.
- Phase Change Material (PCM) slurries offer potential for enhanced heat removal.
Purpose of the Study:
- To investigate inorganic Gallium-Indium (Ga-In) alloy nanoparticles as a novel PCM slurry for thermal management.
- To explore the relationship between nanoparticle properties (size, composition, volume fraction) and slurry performance.
- To assess the potential for Ga-In nanoparticle slurries in high-power electronics and extreme environments.
Main Methods:
- Suspension of Ga-In alloy nanoparticles in a thermal transport fluid.
- Characterization of nanoparticle size, composition, and volume fraction.
- Measurement of thermal conductivity, thermal diffusivity, melting point, and rheological properties of the PCM slurry.
- Analysis of thermal hysteresis and undercooling behavior.
Main Results:
- A low volume fraction (0.10) of Ga-In nanoparticles increased thermal conductivity by nearly 50%.
- The PCM slurry's melting temperature can be optimized to as low as -46 °C.
- Extreme undercooling was observed, with crystallization temperatures near -130 °C, and minimal formation of alpha-Gallium.
- Significant thermal hysteresis was noted, indicating robust solid-liquid phase transition cycling.
Conclusions:
- Ga-In alloy nanoparticle slurries represent a promising advancement in thermal management fluids.
- These slurries offer tunable thermal properties and enhanced heat removal efficiency for electronics.
- The unique undercooling behavior opens possibilities for applications in extreme environments, including space and low-temperature systems.
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