IIT Researchers devise new Composite Material to Shield Against EMI

The Indian Institute of Technology (IIT) Mandi has announced a breakthrough in creating an innovative composite material incorporating biodegradable natural fibers designed to shield against electromagnetic interference (EMI). EMI, which results from the widespread use of electronic devices, poses a significant threat to various electronic systems, including radar, military controls, and network infrastructure. Effective EMI shielding materials are crucial for protecting these systems from such interference.

Researchers at IIT Mandi developed a composite material that combines kenaf fiber, known locally as Deccan Hemp or Ambari, with High-Density Polyethylene (HDPE). This eco-friendly blend not only offers excellent EMI shielding capabilities but also stands out for its recyclability. Kenaf, a natural fiber known for its robustness and lightweight properties, serves as an ideal reinforcement component in the composite, enhancing its mechanical attributes and reducing its environmental footprint. The inclusion of HDPE, a widely utilized recyclable plastic, further enhances the composite's eco-conscious profile.

To optimize the composite for effective EMI shielding, the team incorporated carbon nanotubes (CNTs) to impart electrical conductivity. Their investigation revealed that a composite containing 16 percent kenaf fiber and 5 percent CNTs demonstrated remarkable EMI shielding, exceeding 30 dB, along with outstanding mechanical resilience.

“Cultivating a sustainable future demands innovation that enhances performance while minimizing environmental impact. Our work in developing eco-friendly EMI shielding materials combines technological advancement with ecological responsibility," said Dr. Himanshu Pathak, Associate Professor at the School of Mechanical and Materials Engineering, IIT Mandi. This development represents a significant step toward sustainable technological solutions that address both performance needs and environmental concerns.