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Ni/Graphitic Carbon Core-Shell Nanostructured based Light Weight Elastomeric Composites for Ku-Band Microwave Absorbing Applications

Abstract

Graphitic carbon coated Ni metal core nanoparticles are synthesized using controlled thermal treatment of Ni-hydroxide in aniline-formaldehyde copolymer matrix under N2 atmosphere. The structural and microstructural studies substantiate the formation of graphitic shell on metallic nickel core. The 850°C heat treated core-shell structured material is ferromagnetic in nature with high saturation magnetization. The blocking temperature is above the room temperature. The sample with the highest value of magnetic moment is impregnated in rubber matrix to prepare composite samples with core-shell nanomaterials for different weight fractions. The sample with 70 wt% Ni/Graphitic carbon core-shell in elastomeric rubber matrix showed the optimal microwave absorption at fairly low thickness of ~ 1mm. This is attributed to the optimized combination of the effective impedance matching and interfacial polarization losses. Further increase in Ni/Graphitic carbon filler material resulted into reduced microwave absorption due to greater mismatch of impedance as compared to the desired free space impedance of ~377Ω. Thus, the optimized composite material is of great potential for microwave absorption in Ku band.

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Publication details

The article was received on 17 Apr 2018, accepted on 05 Jul 2018 and first published on 06 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00620B
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Ni/Graphitic Carbon Core-Shell Nanostructured based Light Weight Elastomeric Composites for Ku-Band Microwave Absorbing Applications

    L. Saini, M. K. Patra, M. Dhaka, R. K. Jani, G. Gupta, A. Dixit and S. R. Vadera, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00620B

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