Development of high-efficiency microwave absorption properties of La1.5Sr0.5NiO4 and SrFe12O19-based materials composites

In Part I of this work published previously, it was proved from the transmission-line theory that impedance matching (IM) theory should be replaced by wave cancellation theory, film is different from the material, and the phase effects from interfaces should be considered in quarter wavelength theory. In this Part, it is shown that energy penetration for a film cannot be defined and IM is flawed because it cannot be proved theoretically or shown to be consistent with experimental data. The multi-absorption peaks in a film originate from wave cancellation under the constraint of energy conservation rather than from the resonances from the material.

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Microwave Absorption Performance of Durian-Husk-Derived Carbon Nanomaterials

Tran,

Pham,

Nguyen

et al. 2024

SSP

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The present research focuses on the development of highly efficient and lightweight electromagnetic wave (EMW) absorbers to address the growing issue of electromagnetic pollution. We investigate the use of carbon derived from biomass, specifically durian husks, to create carbon-based microwave absorbers with enhanced performance. A two-step process involving carbonization followed by potassium hydroxide (KOH) activation was employed to synthesize porous carbon materials. The microwave absorption properties were then analyzed using a vector network analyzer across a frequency range from 2 to 18 GHz, with a focus on key parameters such as reflection loss and complex permittivity. The sample, which was 2.0 mm thick and had 15% carbon nanomaterials mixed in with paraffin wax, had an optimal reflection loss of -30.8 dB at 12.8 GHz with an effective absorption bandwidth of 9.0 GHz, highlighting its strong electromagnetic wave absorption performance. The porous structure and large specific surface area significantly contributed to the material’s ability to absorb electromagnetic radiation. These findings highlight the potential of durian husk-derived carbon material as a highly effective and lightweight EMW absorber for practical applications.

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Development of high-efficiency microwave absorption properties of La1.5Sr0.5NiO4 and SrFe12O19-based materials composites

Cited by 3 publications

References 52 publications

Ultra–low–temperature sintering for giant permittivity in CuO ceramics via cold sintering process

Ultra–low–temperature sintering for giant permittivity in CuO ceramics via cold sintering process

A physics investigation on impedance matching theory in microwave absorption film. II. Problem analyses

Microwave Absorption Performance of Durian-Husk-Derived Carbon Nanomaterials

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