FEATURES OF THE INFLUENCE OF NANOMATERIALS ON SHIELDING OF ELECTROMAGNETIC RADIATION BY COMPOSITES

Abstract

The use of nanomaterials as a composite material to improve the efficiency of a protective coating for shielding against electromagnetic interference. Samples were studied using equipment from Keycom Corp. (Japan) developed for measuring the shielding effect. Ultrasonic dispersion of nanomaterials was performed using a UZDN-A1200T ultrasonic disperser. The resistivity of the composite coatings was measured using a ST2558B-F01 standardized 4-electrode cell. The influence of various nanomaterials on the protective properties of thin carbon-polymer coatings has been established. The following nanomaterials have been investigated: boron oxide and carbide, iron oxide, carbon nanotubes, and graphene. The dependence of the resistivity of the coating and the shielding effect on the type of nanomaterial in the composite sample has been established. It has been experimentally proved that the ultrasonic dispersion can improve the shielding effect by 2.5 times. It has been found that graphene has a slight advantage compared to other carbon materials. Also, our results have been established that non-conductive materials such as nano-oxides of iron, boron, and boron carbide can be quite effective for creating radio-absorbing composite materials. The paper proposes a new approach to obtain thin protective coatings against electromagnetic radiation using nanomaterials such as boron carbide, boron oxide, iron oxide, some types of carbon nanotubes, and graphene. The paper proposes a unique algorithm for the ultrasonic dispersion of nanomaterials for the manufacture of composite materials. For the first time, an analysis of the shielding effect of coatings based on domestic materials using international standardized research methods has been carried out. Composite coatings can primarily be used to protect humans from electromagnetic radiation. The materials can be widely used to solve the problems of shielding premises, equipment, in the military, and medical industries.