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首页> 外文期刊>Applied Surface Science >Surface Modification Of Cobalt-chromium-tungsten-nickel Alloy Using Octadecyltrichlorosilanes
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Surface Modification Of Cobalt-chromium-tungsten-nickel Alloy Using Octadecyltrichlorosilanes

机译：十八烷基三氯硅烷对钴铬钨镍合金的表面改性

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Cobalt-chromium (Co-Cr) alloys have been extensively used for medical implants because of their excellent mechanical properties, corrosion resistance, and biocompatibility. This first time study reports the formation and stability of self-assembled monolayers (SAMs) on a Co-Cr-W-Ni alloy. SAMs of octadecyltrichlorosilanes (OTS) were coated on sputtered Co-Cr-W-Ni alloy thin film and bulk Co-Cr-W-Ni alloy. OTS SAM coated alloy specimens were characterized using contact angle goniometry, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Contact angle analysis and FTIR suggested that ordered monolayers were coated on both sputtered and bulk alloy. XPS suggested the selective dissolution of cobalt from the alloy during the formation of OTS SAM. The bonding between the alloy and the OTS SAM was mainly attributed to Si-O-Cr and Si-O-W covalent bonds and a smaller contribution from Si-O-Co bonds. AFM images showed the distribution of islands of monolayers coated on the alloy. The height of monolayers in majority of the islands was closer to the theoretical length of fully extended OTS molecules oriented perpendicular to the surface. The stability of OTS SAM was investigated in tris-buffered saline at 37 ℃ for up to 7 days. Contact angle, FTIR, and XPS collectively confirmed that the monolayers remain ordered and bound to the alloy surface under this condition. This study shows that Co-Cr alloys can be surface modified using SAMs for potential biomedical applications.
机译：钴铬（Co-Cr）合金由于其优异的机械性能，耐腐蚀性和生物相容性而被广泛用于医疗植入物。这项首次研究报告了Co-Cr-W-Ni合金上自组装单层（SAMs）的形成和稳定性。将十八烷基三氯硅烷（OTS）的SAM涂覆在溅射的Co-Cr-W-Ni合金薄膜和块状Co-Cr-W-Ni合金上。使用接触角测角法，傅立叶变换红外光谱（FTIR），X射线光电子能谱（XPS）和原子力显微镜（AFM）对OTS SAM涂层合金样品进行了表征。接触角分析和FTIR表明，在溅射合金和块状合金上均涂覆有序的单层膜。 XPS建议在OTS SAM形成过程中从合金中选择性溶解钴。合金与OTS SAM之间的键合主要归因于Si-O-Cr和Si-O-W共价键，而Si-O-Co键的贡献较小。原子力显微镜图像显示了涂覆在合金上的单层岛的分布。大多数岛上的单分子层高度接近垂直于表面取向的完全延伸的OTS分子的理论长度。在37℃的tris缓冲盐水中长达7天，研究了OTS SAM的稳定性。接触角，FTIR和XPS共同证明，在这种条件下，单层仍保持有序并结合到合金表面。这项研究表明，对于潜在的生物医学应用，可以使用SAM对Co-Cr合金进行表面改性。

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