Microfluidic-Encapsulated Phase Change Fibers with Graphene Coating for Passive Thermal Management

Area of Science:

• Materials Science
• Nanotechnology
• Thermal Engineering

Background:

• Effective thermal management is crucial for electronic device performance and longevity.
• Current passive cooling methods often struggle with high, intermittent heat loads.
• Phase Change Materials (PCMs) offer potential for thermal energy storage but require robust encapsulation.

Purpose of the Study:

• To develop a novel method for encapsulating phase change materials (PCMs) into flexible fibers.
• To enhance the passive cooling performance of these fibers using graphene coating.
• To evaluate the effectiveness of graphene-coated phase change fibers (GPCF) for electronic thermal management.

Main Methods:

• Microfluidic techniques were employed to create core-shell structured phase change fibers.
• A uniform, non-toxic shell was designed to prevent PCM leakage and allow precise dimensional control.
• Graphene coating was applied to the fiber surface to improve thermal conductivity and emissivity.

Main Results:

• The phase change fibers exhibited a uniform core-shell structure with controlled dimensions and PCM ratios.
• Graphene coating enhanced thermal conductivity and emissivity without compromising structural integrity.
• Experiments showed GPCF effectively reduced peak and average temperatures in electronic components under periodic thermal loads.
• Passive cooling using GPCF matched the performance of forced air cooling (0.8 m/s) with zero energy consumption.

Conclusions:

• Graphene-coated phase change fibers provide a highly effective passive thermal management solution.
• GPCF technology offers significant energy savings potential for electronics with intermittent high heat loads.
• This novel fiber encapsulation method holds promise for advanced, sustainable thermal management in electronics.