Cand.Sci. Senatova measures the value of the zeta potential of zinc oxide nanoparticles in solution.
Almost every person "burned" in the sun. The cause of such burns is the exposure of the skin to ultraviolet radiation. The most dangerous from the point of view of the intensity of exposure is UV-B type radiation ranging from 305 to 320 nm. In large quantities, ultraviolet radiation can also lead to mutations that cause melanoma (skin cancer) and premature aging of skin cells. In addition, ultraviolet radiation destroys many polymers (organic glass, polyethylene, polypropylene, etc.), a phenomenon known as "ultraviolet aging."
To protect against harmful and destructive effects of UV radiation around the world Various filters (additives added to polymer compositions and sunscreens) are widely used. Metal oxides (for example, titanium dioxide or zinc oxide) are widely used as filters. But a number of researchers argue that titanium dioxide nanoparticles can have a carcinogenic effect (cause oncological diseases), and zinc oxide stains products on its basis in white, which deprives the transparency of polymer packaging (of zinc oxide, in particular, is made white "white zinc
Appearance of dispersions of zinc oxide in water containing unmodified (left) and modified (right) nanopowders .
" To solve the problem of creating a transparent ksida zinc and producing at its researchers team based UV filter NUST universal "MISA" together with the counterparts of the Russian Cancer Research Center. NN Blokhina proposed a method for the chemical synthesis of zinc nanoparticles with a modified surface "rector of the Institute of MisiS Alevtina Chernikova .
Scientists have learned to control the optical properties of UV filters on Based nanoparticles of zinc oxide directly in the process of their chemical synthesis. In the experiments, a solution of nanoparticles as well as polypropylene films with a nanoadditive showed 100% absorption of type B ultraviolet.
" We synthesized nanoparticles of zinc oxide with a modified surface says one of the participants Scientific employee of the NITU "MISiS" Ph.D. Svetlana Senatova . – Investigation of how the surface modification affects the chemical and physical properties of zinc oxide nanoparticles showed that the nanoparticles obtained can be successfully used as filters to protect against UV radiation. In vitro experiments demonstrated the absence of hemotoxicity of synthesized nanoparticles with a modified silane-containing compound surface during incubation with donor blood .
Since the small size of nanoparticles allows them to penetrate the layers of the skin and enter the human body, Understand how they will affect the blood cells of healthy people.
Appearance of the installation (APC "Nanohim") of the chemical synthesis of nanoparticles in NITU "MISIS"
According to the authors of the development, Modification of the surface of nanoparticles of zinc oxide leads to an increase in their transparency in the visible part of the spectrum, which makes it possible to use them not only in the composition of sunscreens, but also in the manufacture of transparent polymers. Such materials can be used, for example, in the manufacture of transparent food containers, films or in facing panels of structures installed in the open air. In addition, modifying the surface of nanoparticles will reduce the amount of UV filter added by 5-10 times, which entails a positive economic effect.