High Frequency Electromagnetic Shielding by Biochar-Based Composites

Area of Science:

• Materials Science
• Electromagnetics
• Composite Materials

Background:

• Non-structural composites are increasingly used in building construction.
• Biochar is a cost-effective and eco-friendly material with potential applications in composites.
• Effective microwave shielding is crucial for various electronic and communication applications.

Purpose of the Study:

• To investigate the microwave shielding efficiency of biochar-based non-structural composites.
• To determine the relationship between biochar content and shielding properties.
• To establish a method for designing composites with tailored electromagnetic shielding.

Main Methods:

• Direct measurement of complex permittivity for raw materials and composites.
• Utilizing a permittivity mixing formula to calculate properties for various composite combinations.
• Calculating electromagnetic shielding efficiency from complex permittivity data.

Main Results:

• The complex permittivity of biochar composites was measured in the 100 MHz-8 GHz frequency range.
• Tailoring the biochar content in composites allows for precise control over electromagnetic shielding values.
• The study demonstrated the potential for achieving desired shielding properties by adjusting biochar concentration.

Conclusions:

• Biochar composites offer tunable microwave shielding properties suitable for diverse applications.
• The developed approach provides a rapid preliminary tool for designing composites with specific shielding requirements.
• This research highlights the potential of sustainable materials like biochar in advanced composite applications.