Institute of Chemistry and New Materials, Hanoi, Vietnam:

Q. T. Pham, Principal Researcher at the Department of Novel Materials, Candidate of Chemical Sciences, e-mail: phamquangthuan1982@gmail.com

Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia:
A. G. Syrkov, Professor at the Department of General and Technical Physics, Doctor of Technical Sciences, e-mail: Syrkov_AG@pers.spmi.ru
M. O. Silivanov, Associate Professor at the Department of General and Technical Physics, Candidate of Technical Sciences, e-mail: Silivanov_MO@pers.spmi.ru
Q. K. Ngo, Postgraduate Student at the Department of Chemical Technologies and Energy Processing, e-mail: ngoquockhanh292@mail.ru

This paper looks at the production of zinc nanooxides, characterization of their nanostructure and composition with the help of modern instrumental techniques and development of multifunctional ZnO coatings with enhanced properties. Zinc oxide finds various applications in metallurgy: it is used as a useful additive to metallic zinc, in pyrometallurgical processes, as a component of protective coatings on metal, for zincate (immersion) processing of non-ferrous metals. Not only can zinc oxide nanoparticles enhance the protective properties of coatings when exposed to aggressive media, but they can also resist viruses, fungi and microbes on the surface of various materials. Zinc nanooxide (ZnO) is a non-toxic inorganic oxide, therefore it is of relevance to conduct studies to better understand how to synthesize it and apply for food protection. In this study, ZnO nanoparticles were synthesized by the hydrothermal method and characterized with the help of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The average size of ZnO crystals, determined from the X-ray diffraction pattern, is consistent with the results obtained from the SEM images. ZnO nanoparticles were introduced, as an antibacterial agent, in the chitosan/gum Arabic (CH/GA) safe protective coating. It is shown that the durability of such coatings when applied to the surface of cathode nickel can be enhanced through modification of the initial metal with quaternary ammonium compound (triamon and alkamon) based cation-active agents and treatment of ZnO with triamon. This does not affect the antibacterial properties of zinc nanooxides. In fact, nanooxides of zinc are used as an antibacterial additive in chitosan/gum Arabic protective coatings on food by the Hoang Anh Gia Lai International Agricultural Company.

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