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Control of the degradation of silica sol-gel hybrid coatings for metal implants prepared by the triple combination of alkoxysilanes

机译：控制由烷氧基硅烷的三重组合制备的金属植入物的二氧化硅溶胶 - 凝胶杂化涂层的降解

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摘要

Hybrid materials obtained by sol-gel process are able to degrade and release Si compounds that are useful in regenerative medicine due to their osteoinductive properties. The present work studies the behavior of new organic-inorganic sol-gel coatings based on triple mixtures of alkoxysilanes in different molar ratios. The precursors employed are methyl-trimethoxysilane (MTMOS), 3-glycidoxypropyl-trimethoxysilane (GPTMS) and tetraethyl-orthosilicate (TEOS). After optimization of the synthesis conditions, the coatings were characterized using 29Si nuclear magnetic resonance (29Si-MNR), Fourier transform infrared spectrometry (FT-IR), contact angle measurements, hydrolytic degradation assays, electrochemical impedance spectroscopy (EIS) and mechanical profilometry. The degradation and EIS results show that by controlling the amount of TEOS precursor in the coating it is possible to tune its degradation by hydrolysis, while keeping properties such as wettability at their optimum values for biomaterials application. The corrosion properties of the new coatings were also evaluated when applied to stainless steel substrate. The coatings showed an improvement of the anticorrosive properties of the steel which is important to protect the metal implants at the early stages of the regeneration process.
机译：通过溶胶-凝胶法获得的杂化材料能够降解和释放Si化合物，这些化合物由于其骨诱导特性而可用于再生医学。本工作研究了基于不同摩尔比的烷氧基硅烷三元混合物的新型有机-无机溶胶-凝胶涂料的行为。所使用的前体是甲基-三甲氧基硅烷（MTMOS），3-环氧丙氧基丙基-三甲氧基硅烷（GPTMS）和原硅酸四乙酯（TEOS）。在优化合成条件之后，使用29Si核磁共振（29Si-MNR），傅立叶变换红外光谱（FT-IR），接触角测量，水解降解试验，电化学阻抗谱（EIS）和机械轮廓分析法对涂层进行表征。降解和EIS结果表明，通过控制涂层中TEOS前体的量，可以通过水解调节其降解，同时将诸如润湿性等性能保持在生物材料应用的最佳值。当应用于不锈钢基材时，还评估了新涂层的腐蚀性能。涂层显示出钢的防腐性能的改善，这对于在再生过程的早期保护金属植入物很重要。

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