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首页> 外文期刊>Applied Surface Science >Characterization of the structure, thermal stability and wettability of the TiO2 nanotubes growth on the Ti-7.5Mo alloy surface
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Characterization of the structure, thermal stability and wettability of the TiO2 nanotubes growth on the Ti-7.5Mo alloy surface

机译：Ti-7.5Mo合金表面TiO2纳米管生长的结构，热稳定性和润湿性的表征

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In this study, the Ti-7.5Mo experimental alloy for biomedical applications was processed showing orthorhombic (alpha '') martensite phase and low elastic modulus (54 GPa). The surface treatment permitted the growth of ordered TiO2 nanotubes via anodization process. The heat treatment during in situ Raman measurement revealed that the TiO2 nanotubes were transformed of the amorphous state for crystalline (anatase phase) around 400 degrees C. Annealing of the nanotubes was evaluated by XRD, SEM and Raman spectroscopy. Results showed a high stability of the nanostructure, since only for temperatures above of 500 degrees C, at which the phase rutile appears, the nanostructure tends to vanish. It was observed in Raman analysis an increasing of the average size of the crystallite of the anatase phase with annealing temperature ranging from 6.5 nm up to 13 nm, besides of the precipitation of the layer rutile in the interface nanotubes substrate. It is believed that the contact between anatase crystallites or layer rutile of the interface lead to growth of the rutile phase, causing coalescence and subsequent collapse of the tubular nanostructure. The wettability, as well as, surface energy was dependent of the crystalline structure and morphology, becoming more hydrophilic in the anatase phase when as compared with amorphous and rutile phase. The typical features of the surface together excellent bulk properties (low elastic modulus) of the Ti-7.5Mo alloy can provide a guideline for future biomedical applications. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项研究中，对生物医学应用的Ti-7.5Mo实验合金进行了处理，显示出正交晶（α''）马氏体相和低弹性模量（54 GPa）。表面处理允许通过阳极氧化工艺生长有序的TiO2纳米管。原位拉曼测量过程中的热处理表明，TiO2纳米管在400摄氏度左右从非晶态转变为晶体（锐钛矿相）。通过XRD，SEM和拉曼光谱对纳米管的退火进行了评估。结果显示出纳米结构的高度稳定性，因为仅对于出现金红石相的500℃以上的温度，纳米结构趋于消失。在拉曼分析中观察到，除了金红石层在界面纳米管基底中的沉淀之外，随着退火温度在6.5nm至13nm范围内，锐钛矿相的微晶的平均尺寸增加。据信锐钛矿微晶或界面的层金红石之间的接触导致金红石相的生长，引起管状纳米结构的聚结和随后的塌陷。与非晶态和金红石相相比，润湿性以及表面能取决于晶体结构和形态，在锐钛矿相中变得更加亲水。 Ti-7.5Mo合金的表面典型特征以及出色的整体性能（低弹性模量）可以为将来的生物医学应用提供指导。 （C）2016 Elsevier B.V.保留所有权利。

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