Abstract
The present investigation demonstrates the microwave absorption property of magnetic alloy nanoparticle-coated solid industrial waste fly ash cenosphere (FAC). Here, cobalt iron (CoFe) alloy nanoparticles were chemically coated over FAC, and a composite matrix was made from these particles using epoxy resin. Surface morphology of both CoFe-FAC and epoxy/CoFe-FAC composites was studied. The dielectric loss and reflection loss (RL) of this polymer composite were studied by rectangular waveguide transmission line method. A 10 wt% CoFe-FAC-loaded epoxy composite shows an excellent microwave absorption property in the X-band (8.2–12.4 GHz). The most effective RL value −29 dB was obtained for epoxy/CoFe-FAC composite, whereas a pristine epoxy/FAC composite combination exhibits −12 dB RL under same condition. The thickness dependency of RL was also studied, and it indicates that the standard −10 dB RL can be obtained for epoxy/CoFe-FAC composite at a minimum thickness of 2 mm. The enhancement of dielectric loss, EM attenuation constant and loss factor with frequency was found to be responsible for the obtained RL.
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Acknowledgements
Authors gratefully acknowledge the Department of Science and Technology (SB/S3/ME/51/2012) for financial support. This work is technically supported by IISc advanced characterization centre and CeNSE.
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Bora, P.J., Vinoy, K.J., Kishore, Ramamurthy, P.C., Madras, G. (2018). Lightweight Microwave Absorber from Industrial Waste Fly Ash Cenosphere. In: SenGupta, S., Zobaa, A., Sherpa, K., Bhoi, A. (eds) Advances in Smart Grid and Renewable Energy. Lecture Notes in Electrical Engineering, vol 435. Springer, Singapore. https://doi.org/10.1007/978-981-10-4286-7_45
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DOI: https://doi.org/10.1007/978-981-10-4286-7_45
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