Novel electromagnetic waves absorbing nanocomposite based on polyurethane matrix containing Y3Fe5O12, La1.8Sr0.2Ni1-xCoxO4-CaCu3Ti4-xNbxO12 and polyaniline: Performance investigation an optimization

Abstract

In the present study, a novel nanocomposite (NCs) consisting; Yttrium iron garnet Y3Fe5O12 (YIG) magnetic material, La1.8Sr0.2Ni1-xCoxO4-CaCu3Ti4-xNbxO12 (LSNCO-CCTNO) (0 < x < 1) ceramic and electric conductive nanofiber (NFs) of polyaniline (PANI) in polyurethane (PU) resin was successfully synthesized via co-precipitation-calcination, semi-wet sol-gel and interfacial polymerization methods, respectively. The structure, morphology and electromagnetic waves (EMW) absorption features of the synthesized nanoparticles (NPs) were specified by XRD, SEM and vector network analyzer. The response surface methodology (RSM) conjugated with central composite design (CCD) was applied to optimize the content of YIG, LSNCO-CCTNO and PANI in the structure of synthesized NCs and also improve the efficiency of EMW absorption. The proposed quadratic model was in accordance with the experimental results with correlation coefficient of 97.45%. The minimum reflection loss (higher absorption) was calculated below −30 dB (absorption greater than 99.9%) with area under the curve of reflection loss plot of 36,571 (MHz. dB) for optimized NCs, including 2.5 wt% of YIG, 5%wt. of LSNCO- CCTNO, 4%wt of the PANI in the 8–12 GHz frequency range (X-band of EMW).