Abstract
A state of titanium oxide and oxynitride coatings on L316 steel has been studied before and after their contact with model biological fluids. Electrokinetic investigation in 1 mmol potassium chloride showed significant (more than 10 times) fall of magnitude of electrostatic potential of thin (200–300 nm) titanium films at pH changing in the range of 5–9 units during 2 h. Nevertheless, zeta-potential of all samples had negative charge under pH > 6.5. Long-term (5 weeks) contact of samples with simulated body fluid (SBF) promoted steel corrosion and titanium oxide and oxynitride films dissolution. On the other hand, sodium and chloride ions precipitation and sodium chloride crystals formation occurred on the samples. Of positive fact is an absence of calcification of tested artificial surfaces in conditions of long-term being in SBF solution. It is supposed decreasing hazard of fast thrombosis and loss of materials functional properties. According to in vitro experiment conducted, prospective biocompatibility of materials tested before and after their contact with SBF lines up following manner: Ti–O–N (1/3) > Ti–O–N (1/1), TiO2 > Steel. It may be explained by: 1) the corrosion-preventive properties of thin titanium oxide and oxynitride films;2) a store of surface negative charge for Ti–O–N (1/3) film; 3) minor augmentation of mass and thickness of titanium films connected with speed of mineralization processes on the interface of solution/solid body. At the same time, initial (before SBF contact) differences of samples wettability became equal. Modifying effect of model biological fluids on physicochemical characteristics of materials tested (roughness enhancement, a reduction or reversion of surface negative potential, sharp augmentation of surface hydrofilicity) should took into account under titanium oxide and oxynitride films formation and a forecast of their optimal biological properties as the materials for cardiovascular stents.
Highlights
Electrokinetic investigation in 1 mmol potassium chloride showed significant fall of magnitude of electrostatic potential of thin (200–300 nm) titanium films at pH changing in the range of 5–9 units during 2 h
According to in vitro experiment conducted, prospective biocompatibility of materials tested before and after their contact with SBF lines up following manner: Ti–O–N (1/3) > Ti–O–N (1/1), TiO2 > Steel. It may be explained by: 1) the corrosion-preventive properties of thin titanium oxide and oxynitride films; 2) a store of surface negative charge for Ti–O–N (1/3) film; 3) minor augmentation of mass and thickness of titanium films connected with speed of mineralization processes on the interface of solution/solid body
Relationship between surface properties (roughness, wettability) of titanium and titanium alloys and cell behaviour // Materials Science and Engineering C
Summary
Изучено состояние оксидных и оксинитридных покрытий титана на стали L316 до и после их контакта с модельными биологическими жидкостями. Длительный (5 нед) контакт образцов с SBF (simulated body fluid) вызывал коррозию стали и растворение пленок оксида и оксинитридов титана. Модифицирующее влияние модельных биологических жидкостей на физико-химические особенности тестируемых материалов (увеличение шероховатости, снижение амплитуды или реверсия отрицательного потенциала поверхности, резкое повышение гидрофильности поверхности) следует учитывать при формировании оксидных и оксинитридных покрытий титана и прогнозировании их оптимальных биологических свойств как материалов для сердечно-сосудистых стентов. Цель исследования – изучение состояния оксидных и оксинитридных покрытий титана на стали до и после контакта с модельной биологической жидкостью, потенциального вклада изменений физикохимических свойств их поверхности в механизмы биои гемосовместимости эндопротезов сосудистой стенки
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