A Stretch-Tunable, Self-Healing Liquid Metal-Based Broadband Electromagnetic Wave Absorber

Area of Science:

• Materials Science
• Electromagnetics
• Polymer Science

Background:

• Traditional electromagnetic wave (EMW) absorbers have fixed properties, limiting adaptability in complex environments.
• External forces can tune wave absorption but often cause material damage and performance degradation.

Purpose of the Study:

• To create a flexible, broadband EMW absorbing material with tunable absorption and self-healing capabilities.
• To overcome limitations of conventional absorbers by integrating liquid metal and self-healing polymers.

Main Methods:

• Fabrication of a composite material combining liquid metal (LM) and a self-healing polymer.
• Characterization of material properties including extensibility, electromagnetic absorption, and self-healing efficiency.
• Evaluation of dynamic tunability of wave absorption under external force.

Main Results:

• The developed material exhibits high extensibility (∼3000% strain).
• Achieved an excellent effective absorption bandwidth (EAB) of 7.50 GHz in the X and Ku bands.
• Demonstrated dynamic adjustability of absorption performance and self-healing recovery of ∼98% EAB at room temperature.

Conclusions:

• The novel material offers a promising solution for flexible, adaptive EMW absorption.
• The combination of LM and self-healing polymers enables robust and tunable wave-absorbing properties.
• This work provides insights for developing next-generation flexible electromagnetic materials.