节点文献
复合氧化物纳米结构的制备与性能研究
Fabrication and Properties of Composite Oxide Nanostructures
【作者】 李岩；
【导师】 丁冬雁；
【作者基本信息】 上海交通大学 ， 材料学， 2009， 硕士
【摘要】 纳米氧化钛因其自身的优良性质被广泛用于光催化、光电转换、传感器等领域。通过阳极氧化可以在钛或钛合金表面形成氧化钛基复合纳米结构。本文首先系统研究了阳极氧化电压与合金元素对复合氧化物纳米结构的表面形貌与成分的影响,然后对各种复合氧化物纳米结构的热稳定性进行了深入地分析,最后探索了Ti-Al-V-O纳米结构的体外生物活性。实验结果表明:随着阳极氧化电压的升高,制备的纳米管管径变大、管长变长;合金元素有利于低电压下形成复合氧化物纳米管。对于Ti6Al4V合金氧化体系的研究表明:Al元素有维持纳米管生长的作用;V元素溶解性较高所以不能维持纳米管的生长。通过对Ti35NbxZr合金氧化体系的研究发现:Zr含量越高的合金阳极氧化后得到的Ti-Nb-Zr-O纳米管管径越小、管长越长。比较从纯钛和钛合金制备的各种复合纳米管热稳定性后发现:纯钛制备的Ti-O纳米管耐热温度为650oC;Ti-Al-V-O纳米管耐热温度为675oC,而Ti-Al-V-O纳米孔的耐热温度低于Ti-Al-V-O纳米管。Ti35NbxZr合金氧化制备的Ti-Nb-Zr-O纳米管热稳定性相比起来较好,可以在高温750oC时仍然维持其管状纳米结构。研究表明450oC晶化处理的Ti-Al-V-O纳米结构体现出良好的体外生物活性。
【Abstract】 Due to their novel properties titania nanomaterials have been widely used in photocatalitic, photoelectronic conversion and sensor fields. Through anodization a layer of TiOx-based composite nanostructures could grow on the surface of Ti and Ti alloys. In this work, the effect of anodization voltage and alloying elements on the morphology and composition of the composite nanostructures was investigated systematically. Thermal stability of the composite nanostructures and in vitro bioactivity of Ti-Al-V-O nanostructures were also investigated.With increase of the anodization voltage, the diameter and the length of nanotubes become bigger and longer, respectively. Alloying elements promote the formation of composite nanotubes at low anodization voltage. For the anodization of Ti6Al4V alloy, it was found that Al element could keep the formation of nanotubes and V element could not keep the formation of nanotubes due to its high dissolution rate. Investigation on the anodization of Ti35NbxZr alloys revealed that, with increaset of the Zr content in the original Ti35NbxZr alloys, the diameter and length of the as-grown Ti-Nb-Zr-O nanotubes became smaller and longer, respectively. A comparison of all the composite nanostructures fabricated from Ti and its alloy indicate that Ti-O nanotubes fabricated from Ti could withstand a temperature of 650 o C. Ti-Al-V-O nanotubes could withstand 675oC, while Ti-Al-V-O nanopores could withstand a lower temperature than that of Ti-Al-V-O nanotubes. Ti-Nb-Zr-O nanotubes presented the best thermal stability as they could withstand 750oC without a damage of their tube-like nanostructures. We also found that the Ti-Al-V-O nanostructures possess a good in vitro bioactivity.