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Macro-ordered Porous Carbon Nanocomposites for Efficient Microwave Absorption by Yu Tian; Diana Estevez; Ge Wang; Mengyue Peng; Faxiang Qin is a Materials Science article available to read on EtoBox.

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Tunable and efficient porous carbon-based microwave absorbers are essential in electromagnetic compatibility and protection due to their pronounced dielectric losses and ultralow density. However, it is still challenging to achieve satisfactory impedance matching and attenuation ability owing to the difficulty of realizing custom-designed porous structures. Herein, we propose a material-structure collaborative approach which includes multi-scaling, component modulation and systematic investigation of macroscopic structures. Macro-ordered porous carbon nanocomposites (MOPCN) assembled with MWCNTs and chitosan (CHI) were fabricated via freeze-casting and MWCNTs/CHI ratio regulation. By simply varying the freezing temperature gradient distribution from radial (R) to axial (A), radial-centrosymmetric and honeycomb-like pore arrays were realized respectively. Compared to the honeycomb-like pore array, the radial-centrosymmetric pore array imparts much stronger microwave attenuation capability due to enhanced phase contiguity and optimized spatial arrangement. Such configuration also enabled to optimize impedance matching and absorption, alleviating the over-dependence of microwave absor

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Author

Yu Tian; Diana Estevez; Ge Wang; Mengyue Peng; Faxiang Qin

Publisher

Elsevier BV

Published

2024

Language

EN

Field

Materials Science (Physical Sciences)