Preparation method of ferroferric oxide/manganese dioxide composite microspheres

Abstract

The invention belongs to the technical field of nanomaterials, and particularly discloses a preparation method of ferroferric oxide / manganese dioxide composite microspheres. According to the method, ferric chloride hexahydrate is used as an iron source, potassium permanganate is used as a manganese source, polyvinylpyrrolidone is used as a binder, deionized water is used as a solvent, and the ferroferric oxide / manganese dioxide composite microspheres adopting the multilevel structure are successfully prepared through processes such as hydro-thermal synthesis, ball milling, spray-drying, heat treatment and the like sequentially. The microspheres have the relatively large specific surface area, the magnetic loss of the microspheres is increased due to the relatively good magnetism, the dielectric loss of the microspheres is increased due to the good electric conductivity, through detection, the maximum microwave absorption can reach -22dB when the thickness of samples is 2.5 mm, and theabsorption frequency band is 5.2 GHz. The microspheres have the excellent performance of broadband and high-intensity absorption. Thus, the microspheres can be high-performance materials in the fieldof microwave absorption application. Besides, the method has the advantages that the preparation technology is simple, the preparation period is relatively short and the like, is very suitable for industrial mass production and has the broad application prospect.

Description

Technical field [0001] The invention belongs to the technical field of nano material synthesis, and specifically relates to a method for preparing ferroferric oxide / manganese dioxide composite microspheres assembled from nano small particles. Background technique [0002] Due to the widespread use of mobile communication devices and electronic devices in daily life, people gradually realize that electromagnetic waves radiated by electronic devices will affect people's physical and mental health. In order to reduce and eliminate the harm of electromagnetic waves to life, people have carried out a lot of research work. Although there has been significant progress in microwave absorption in recent decades, the performance of microwave absorbing materials has also become increasingly excellent. However, there are still shortcomings such as high density, narrow absorption band, difficulty in industrial production, or high production cost and complex process, which makes it difficult ...

AI Technical Summary

Problems solved by technology

However, there are still disadvantages such as high density, narrow absorption frequency band, difficult industrial preparation or high preparation cost and complicated process, making it difficult to meet the growing demand [1-4]

[0003] At present, people have done extensive and in-depth research on microwave absorbing materials, but the same type of microwave absorbing materials have their own limitations.

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