Abstract
The paper is dedicated to the development of effective composite coatings with the use of carbon fillers of different morphology, their research, and application in the broadband frequency range. Electromagnetic loss studies were performed according to international standards ASTM D4935, IEEE-STD-299, and the US Department of Defence standard MIL-STD 461F. The impact of hybrid carbon nanomaterial "graphene/nanotubes" on the electrophysical properties of the composite material has been analyzed. As a result, the research laboratory technologies of production of composite coating on water and non-water (alcohol) basis are developed based on the carbon fillers of various morphology and also magnetite. The shielding properties of most of the created composites are estimated in the frequency range from 50 MHz to 30 GHz. The state enterprise “All-Ukrainian center for standardization, metrology, certification, and consumers’ rights protection” (here and after “Ukrmetrteststandart”) conducted comparative tests of the developed coating (in the form of paint) with a protective coating # 842 MG Chemicals (Burlington, Ontario, Canada) based on silver microparticles. Developed water-based composites can be used for interior decoration, in the formation of electromagnetic screens, thin gradient coatings to protect people from electromagnetic radiation in the microwave range.
Highlights
The rapid development of electronic devices and gadgets in wireless communication, and their constant use in everyday life inevitably creates a strong electromagnetic radiation (EMR) in the environment [1]
At the very beginning of a research, the task was to improve the first generation of KNUTD paint, developed on the basis of colloidal graphite, graphitized carbon black and polyvinyl butyral (PVB) [38]
Scientific studies have shown a clear synergistic effect when using a mixture of carbon fillers with different structure and morphology, which leads to a significant increase in shielding efficiency (SE) than would make a simple arithmetic sum of SE and each a separate component
Summary
The rapid development of electronic devices and gadgets in wireless communication, and their constant use in everyday life inevitably creates a strong electromagnetic radiation (EMR) in the environment [1]. The main way to reduce the negative impact of EMR is to develop means of protection for electronic devices, humans and the environment, namely the creation of various types of shielding [11] and absorbing [12, 13] materials. Such materials have a wide range of applications, including commercial and scientific electronics, antenna systems, space exploration and medical devices [14], a wide range of military programs [15,16,17,18]. That is why polymer composites filled with carbon materials can be even more promising in use
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