Enhanced Thermal Pad Composites Using Densely Aligned MgO Nanowires.

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Thermal interface materials (TIMs) are essential for heat dissipation in miniaturized electronics.
• Conventional thermal pads often have low thermal conductivity.
• Filler aggregation in composites can limit thermal performance.

Purpose of the Study:

• To develop novel nanocomposites with enhanced thermal conductivity and mechanical flexibility.
• To investigate the effect of filler alignment on thermal performance.
• To create a reusable alternative to thermal paste TIMs.

Main Methods:

• Fabrication of MgO structures using a freeze dryer.
• Compression of MgO structures to create alignment.
• Infiltration of polydimethylsiloxane (PDMS) into the aligned MgO structures.
• Characterization of thermal conductivity and electrical resistivity.

Main Results:

• Achieved a thermal conductivity of approximately 1.18 W m^-1K^-1, superior to randomly distributed fillers.
• Maintained mechanical flexibility in the developed nanocomposites.
• Exhibited excellent electrical insulating properties with high resistivity (7.92 × 10¹⁵ Ω∙cm).

Conclusions:

• Densely aligned MgO nanowire fillers in a PDMS matrix significantly improve thermal conductivity.
• The proposed nanocomposites offer a promising solution for efficient heat management in electronic devices.
• The materials provide a balance of thermal performance, mechanical flexibility, and electrical insulation.