Hierarchical Manufacturing of Anisotropic and High-Efficiency Electromagnetic Interference Shielding Modules for...

Area of Science:

• Materials Science
• Nanotechnology
• Manufacturing Engineering

Background:

• Shielding electronics from electromagnetic interference (EMI) is critical.
• Current manufacturing methods face challenges in structural customization and performance.
• Wireless electromagnetic waves create complex electromagnetic environments.

Purpose of the Study:

• To develop a hierarchical manufacturing method for structurally customizable and multifunctional polylactic acid@graphene nanoparticle (PLA@GNs) materials.
• To achieve high electromagnetic interference shielding performance and directional thermal conductivity.
• To demonstrate the application of 3D-printed shielding modules in civilian frequency bands.

Main Methods:

• Utilizing a 3D printing shear flow field to orient graphene nanoparticles (GNs) within polymer fluids.
• Employing layer-by-layer assembly for macro-scale 3D architecture fabrication.
• Using computational fluid dynamic simulation to analyze molecular chain and nanoparticle structural evolution via the Weissenberg number.

Main Results:

• Achieved a shielding performance of 41.2 dB due to aligned GNs.
• Demonstrated directional thermal conductivity of 3.2 W m⁻¹ K⁻¹.
• Successfully applied 3D-printed modules for 4G, Bluetooth, and 5G frequency bands.

Conclusions:

• Established a universal methodology for 3D printing-driven nanoparticle orientation in polymer fluids.
• Provided a scientific method for advanced manufacturing of next-generation electromagnetic functional modules.
• Enabled the creation of customizable and high-performance shielding materials for smart electronics.