Geopolymer Carbon-Based for Ultra-Wideband Absorbent Applications

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Absorbent designs require dimension reduction, cost efficiency, and environmental sustainability.
• Geopolymers offer an eco-friendly and cost-effective alternative for absorbent applications.

Purpose of the Study:

• To develop novel geopolymer-based composites with precisely controlled dielectric properties.
• To investigate the influence of carbon materials and surfactants on geopolymer composite characteristics.

Main Methods:

• Formulation of geopolymer composites using three distinct carbon types and various surfactants.
• Preference for nonionic over anionic surfactants based on performance.
• Dielectric property characterization within the 2 to 3.3 GHz frequency range.

Main Results:

• Carbon content and type significantly impact dielectric properties, including permittivity (ε) and loss tangent (tan δ).
• Permittivity increased from 2 to 24, and loss tangent increased from 0.09 to 0.6 with variations in carbon.
• Optimal properties (ε=2.27, tan δ=0.19) achieved with low-purity carbon, nonionic surfactant, and 1.6 mm pore size.
• Magnetite addition showed minimal effect on the overall magnetic properties of the geopolymer composites.

Conclusions:

• Geopolymer composites can be engineered for tailored dielectric performance by controlling carbon content and type.
• Nonionic surfactants and specific carbon characteristics are crucial for optimizing dielectric properties in these composites.
• The developed materials show promise for applications requiring efficient electromagnetic absorption.