Graphene-enhanced nanorefrigerants.

Area of Science:

• Materials Science
• Nanotechnology
• Thermodynamics

Background:

• Nanoparticle dispersions in host liquids can enhance thermal properties for advanced heat transfer fluids.
• Challenges include long-term stability of refrigerant-based dispersions and significant viscosity increases with anisotropic nanomaterials like carbon nanotubes.

Purpose of the Study:

• To overcome limitations in preparing stable, high-performance nanorefrigerants.
• To develop a new class of nanorefrigerants with enhanced thermal conductivity and manageable viscosity.

Main Methods:

• A robust surfactant-mediated dispersal method was used to prepare stable suspensions of various nanomaterials in commercial refrigerants.
• Graphene nanosheets were specifically formulated as additives.

Main Results:

• Stable nanorefrigerant suspensions were successfully prepared using the new method.
• Graphene nanosheet suspensions achieved superior thermal conductivity enhancements comparable to carbon nanotubes.
• These nanorefrigerants did not exhibit the significant viscosity penalty associated with carbon nanotubes.

Conclusions:

• The developed surfactant-mediated method enables the stable incorporation of nanomaterials into refrigerants.
• Graphene nanosheet nanorefrigerants offer a promising, cost-effective solution for improving thermal management efficiency.
• These advanced fluids can be directly substituted for conventional refrigerants in various applications.