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The oxidation of calcium implanted titanium in water: A depth profiling study

机译:钙离子注入水中钛的氧化:深度分析

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Ion implantation of calcium has been proposed previously as a route to bioactive titanium surfaces and has been shown to stimulate promising cell and tissue responses. While the precise reasons for this behaviour remain poorly understood, it is clear that the nature of the Ca implanted surface changes rapidly on exposure to body fluids. In order to understand the processes taking place more clearly, the current work examined the simple interaction of Ca implanted Ti with water. The surface chemistry and compositional changes within the sub-surface region of the modified Ti were examined. On immersion in water, the concentration of implanted Ca ions was found to decrease both at the surface and throughout the implanted region. At the same time, the sub-surface oxygen concentration was found to increase dramatically. Although Ca implantation into Ti results in a thicker oxide layer at the surface, it appears that this layer no longer affords the underlying Ti the same protection from further oxidation provided by the native oxide. By examining samples implanted with O, Ti or Ar it was possible to conclude that this was specific to Ca implantation and not a result of the ion implantation process itself.
机译:先前已经提出离子注入钙作为生物活性钛表面的一种途径,并已显示出可以刺激有希望的细胞和组织反应。尽管对该行为的确切原因仍知之甚少,但很明显,植入Ca的表面的性质在暴露于体液后会迅速变化。为了更清楚地了解发生的过程,当前的工作检查了植入Ca的Ti与水的简单相互作用。检查了改性Ti的亚表面区域内的表面化学和组成变化。浸入水中后,发现植入的Ca离子的浓度在表面和整个植入区域均降低。同时,发现地下氧浓度急剧增加。尽管将Ca注入Ti中会在表面上形成一个较厚的氧化物层,但似乎该层不再为下面的Ti提供相同的保护,使其免受天然氧化物提供的进一步氧化。通过检查注入O,Ti或Ar的样品,可以得出结论,这是Ca注入所特有的,而不是离子注入过程本身的结果。

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