چكيده به لاتين
The role of electromagnetic waves in human life today is well known. Numerous applications of electromagnetic waves have made our surroundings always exposed to electromagnetic waves of varying frequencies. Radiation can cause disruption to electronic devices or damage the human body. It also uses military radars to detect and detect military equipment, such as aircraft, tanks, ships, and so on, reflecting the electromagnetic waves emitted on the surface of military equipment. Therefore, the use and fabrication of absorbent materials for the protection of humans and devices as well as the protection of military equipment against electromagnetic radiation have been considered and extensive studies have been conducted on the design and fabrication of these materials.
In this study, the effect of polypropylene coatings on barium hexaferrite / barium titanate / carbon nanotube hybrid nanostructure was investigated. For this purpose, barium hexaferrite nanoparticles were first synthesized using the inverse coupling method. The synthesized nanoparticles were single phase with a saturation magnetization of 61 emu / g and a forced Oe of 3000. The barium titanate nanoparticles were also synthesized by the hydrothermal method which had a cluster-like structure with a narrow size distribution and nano dimensions. Each of the components were then coated with polypropylene or without polypropylene coating to produce the desired hybrid nanostructure. To investigate the adsorption properties of electromagnetic waves and to investigate the effect of coating on magnetic properties, sample thickness parameters (2 mm), percentage of filler powder components (barium titanate and barium hexaferite 45% and carbon nanotubes 10%) and powders 20% ) Was used consistently and unchanged in the samples. In the five VNA test samples synthesized in polyurethane, the prototype of all three barium hexaferrite, barium titanate and carbon nanotube powders was coated in the second sample of barium hexaferite and the other two powders were coated in the third sample of barium titanate. The data were in the fourth sample of carbon nanotubes coated with polypropylene and in the latter sample all the powders were coated with polypropylene. The desired nanostructure was prepared by mechanical mixing method and component coating was done by in situ polymerization. The results of the vector analysis test showed that the sample containing all 3 powders coated with polypropylene had the highest amount of electromagnetic radiation absorption at -20 db at 10 mm thick.
