NiTi coated with oxide and polymer films in the in vivo healing processes
| Autor: | Florin Nastase, Mihaela Gherghiceanu, Manuella Militaru, Petre Badica, Dan Batalu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
Materials science Oxide 02 engineering and technology Electrolyte 01 natural sciences Biomaterials chemistry.chemical_compound 0103 physical sciences Composite material lcsh:Mining engineering. Metallurgy 010302 applied physics chemistry.chemical_classification Metals and Alloys Polymer 021001 nanoscience & nanotechnology Isotropic etching Poly(methyl methacrylate) Surfaces Coatings and Films Electropolishing chemistry Nickel titanium visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology Layer (electronics) |
| Zdroj: | Journal of Materials Research and Technology, Vol 8, Iss 1, Pp 914-922 (2019) |
| ISSN: | 2238-7854 |
| Popis: | Plates of NiTi chemically etched, electro-polished, and sol–gel coated with XO2 (X = Ti, Si, Zr), or coated with oxides and dip-coated polymers of Dextro-Levo-lactide-co-glycolide (DL-PLG, 0.4 μm thickness), Dextro-Levo-lactic acid (DL-PLA, 1.3 μm) or poly methyl methacrylate polymer (PMMA, 1.7 μm) were obtained. Smooth and uniform NiTi surfaces without significant pitting, as revealed by AFM, were prepared for chemical etching of 120 s in HF:HNO3:H2O = 1:5:4, followed by electropolishing 120 s in H2SO4:CH3OH:H2O = 1:4:5 electrolyte and using a potential of 9 V. Dip-coated layer of PMMA has shown cracks and large pores and was eliminated from further experiments. Samples of pristine and coated NiTi were in vivo implanted into rabbits and extracted after 10 and 60 days. Clinically, all implants are biocompatible; all rabbits survived and a recovery process was observed for all cases. NiTi covered with SiO2, DL-PLG and SiO2/DL-PLG have shown the best healing evolution. For 10 and 60 days good recovery was found also for NiTi coated with TiO2. Coatings of ZrO2 and ZrO2/DL-PLG have shown the poorest results. The oxide coating and the roughness RZJIS that contains information on the ‘deep’ large areas in the coatings show the strongest influence on the healing processes. Work indicates the possibility of space- and time- scale controlled variation of the functional properties. Keywords: NiTi alloy, Coating of TiO2, SiO2, ZrO2, DL-PLG, DL-PLA, PMMA, Roughness, In vivo test |
| Databáze: | OpenAIRE |
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