THE STUDY OF NANOSTRUCTURED ANATASE COATINGS ON THE SURFACE OF RUTILE

Nanosized titanium dioxide allows solving complex engineering problems. One of such tasks is the creation of materials and coatings that reduce the likelihood of nosocomial infections on the surface of  orthopedic structures including implant systems. The paper presents  the results of the Raman spectroscopy, X-ray diffraction analysis and  scanning electron microscopy of anatase ceramic coatings deposited  by sol-gel technology on a sintered material based on a nanosized  titanium dioxide powder (rutile modification). The resulting coating  has a complex layered structure, which is almost completely  represented by titanium dioxide in the anatase phase according to  the Raman spectroscopy data. The simultaneous existence of both  phases in the coating was recorded. The identification of rutile on  diffractograms seems to be due to the fact that modified peak  intensity rutile is mainly formed during the first stages of coating application on the polycrystalline rutile surface. The fact that non-stoichiometric phases also present in the diffractograms suggests  that coating phase composition is not the same in thickness and is  represented by a gradual layerwise transition from rutile to anatase.  The coating thickness is 60 ± 15 μm. The coating is represented by  lamellar blocks of various sizes. The thickness of a single plate in the  coating is 60–80 nm. The developed technique makes it possible to apply the anatase coating not only on samples of titanium dioxide  ceramics but also on the surface of titanium implants with the preliminary formation of a titanium dioxide layer in the form of rutile  on the metal surface. Experiments on the study of  antibacterial properties and morphological characteristics of bone  tissue in contact with the implant were carried out at the  Department of Prosthetic Dentistry at the PSMU.

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