No abstract

In this work, ternary composites of NiZn ferrite/carbonyl iron/carbon black (Ni0.5Zn0.5Fe2O4/CI/CB) were prepared via two stages. Firstly, Ni0.5Zn0.5Fe2O4 was prepared by a self-combustion method using sucrose as a fuel. After that, the operation was continued via mixing CB, CI, and Ni0.5Zn0.5Fe2O4 through grinding balls. Three various weight ratios of Ni0.5Zn0.5Fe2O4/CI/CB (1:1:1, 1:1:2, and 2:1:1) with various thicknesses (2–4–6 mm) were prepared. The absorbers were prepared by dispersing (Ni0.5Zn0.5Fe2O4/CI/CB) composites with a weight ratio within a paraffin wax matrix of 40 % w/w. X-ray diffractometry and FTIR spectroscopy were used in order to characterize the samples. The morphology of the powders was investigated by SEM. The functional characterization was accomplished by measuring the microwave absorption properties in the fre-quency band of 8.8–12 GHz. The microwave absorption materials (MAMs) showed wide bandwidths under –10 dB in the range of 2.81–3.20 GHz and reasonable surface density in the range of 3.625–4.041 kg/m2. The absorber of 3.20 GHz bandwidth had a minimal reflection loss of –19.4 dB at the matching frequency of 9.92 GHz with a thickness of 6 mm.

NiZn ferrite (Ni3 + 0.25Ni2+0.375Zn2+0.25Fe2O4) is coated with polyaniline (PANI) using an in-situ polymerization technique. Three various weight ratios of PANI/Ni3 + 0.25Ni2+0.375Zn2+0.25Fe2O4 (1:1, 2:1, and 3:1) are synthesized. The absorbers are synthesized by introducing PANI/F nanocomposites within a paraffin wax of 25% w/w. X-ray diffractometry, FTIR spectroscopy, UV-vis spectroscopy, TGA analysis and SEM analysis are utilized in order to characterize the samples. The electromagnetic interference (EMI) shielding and microwave absorption (MA) properties are measured in the frequency band of 8.8–12 GHz to investigate the microwave characterization. Minimal reflection loss of -19.8 dB at the matching frequency of 10.8 GHz and the absorption bandwidth under − 10 dB of 2.2 GHz for 3.12 mm thickness with a surface density of 3.07 kg/m2 are noticed for the PANI/F.2 nanocomposite sample. The maximum shielding efficiency of 23.18 dB at 11.1 GHz for 2.90 mm thickness is observed for the PANI/F.2 nanocomposite.

In this work, Ternary composites of NiZn ferrite/carbonyl iron/carbon black (Ni0.5Zn0.5Fe2O4/CI/CB) are prepared via two stages: Firstly, Ni0.5Zn0.5Fe2O4 is prepared using a self-combustion method. After that, the process is continued via mixing CB, CI, and Ni0.5Zn0.5Fe2O4 through the grinding balls. Three various weight ratios of Ni0.5Zn0.5Fe2O4/CI/CB (1:1:1, 1:1:2, and 2:1:1) with various thicknesses (2–4–6 mm) are prepared. The absorbers are prepared by dispersing (Ni0.5Zn0.5Fe2O4/CI/CB) composites with a weight ratio of 40% w/w within a paraffin wax matrix. X-ray diffractometry and FTIR spectroscopy are utilized in order to characterize the samples. The morphology of the powders is investigated by SEM. The electromagnetic interference (EMI) shielding and microwave absorption properties are measured in the frequency band of 8.8–12 GHz to investigate the microwave characterization. The microwave absorption materials (MAMs) show wide bandwidths under − 10 dB in the range of 2.8–3.2 GHz and reasonable surface density in the range of 3.62–4.04 kg/m2. The MAM shows a minimal reflection loss of -19.4 dB at the matching frequency of 9.9 GHz for the thickness of 6 mm. The maximum shielding efficiency is 21.7 dB at 11.0 GHz for 4 mm thickness of the F/CI/CB-111 composite sample.

In this paper, Ternary composites of polyaniline/NiZn ferrite/carbonyl iron (PANI/F/CI) are prepared via two stages: Firstly, Ni0.5Zn0.5Fe2O4 is prepared using a sol-gel method while carbonyl iron is commercially purchased. After that, PANI/F/CI composites are prepared using an in-situ polymerization technique of PANI in the existence of the Ni0.5Zn0.5Fe2O4 and CI. X-ray diffractometry, FTIR spectroscopy, UV-vis spectroscopy, TGA analysis, and SEM analysis are utilized in order to characterize samples. The morphology of the powders is investigated by SEM. The electromagnetic interference shielding and microwave absorption properties are measured in the frequency band of 8.8–12 GHz to investigate the microwave characterization. The results refer those microwave absorption properties are related to the absorber thickness and the loading ratio of the absorber within a paraffin matrix. Minimal reflection loss of -30.8 dB at the matching frequency of 10.3 GHz and the absorption bandwidth under − 10 dB of 2.8 GHz for 3.4 mm thickness with a surface density of 3.38 kg/m2 are noticed for the PANI/F/CI composite sample. The maximum shielding efficiency of 30.12 dB at 11.0 GHz for 3.2 mm thickness is observed for the PANI/F/CI composite sample.