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Abstract
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tAt a few works are discussed about formation of heterogeneous composites with different distributionof particle shape and size that are used for electromagnetic absorption purposes. In this study a novelheterogeneous nanocpmposites is investigated. The nanocomposite has been successfully prepared basedon epoxy resin including various nano-metal oxides (TiO2, SrFe12O19) and polypyrrole (PPy) by sol-gel andthe solution chemistry method, respectively. The performance of prepared nanocomposite in absorptionof microwave in X-band range was investigated and transmission line method by X-band waveguidestraight was used to measure EM parameters of nanocomposites. The Response surface methodology(RSM) with central composite design (CCD) was utilized to study the effects of the wt.% TiO2in SrFe12O19,wt.% Tio2-SrFe12O19in PPy and wt.% TiO2-SrFe12O19-PPy in epoxy resin, on the microwave absorptionproperties with the absorber thickness of only 2 mm. The proposed quadratic model was in accordancewith the experimental results with correlation coefficient of 96.5%. The optimum condition for maximummicrowave absorption efficiency were wt.% TiO2in SrFe12O19of 70, wt.% TiO2-SrFe12O19in PPy of 10 andwt.% TiO2-SrFe12O19-PPy in epoxy of 25. The sample prepared in optimal conditions indicated reflectionloss of −15 dB corresponding to 97% absorption, at the range of 9.2–10.8 GHz.
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