本研究主要在利用電化學交流阻抗分析法,對二氧化鈦奈米管進行結構上之分析。首先以0.5%HF及10%H2SO4作為電解液,鈦試片為陽極,鉑片為陰極,在電壓18V、時間為120分鐘的條件下對鈦試片作陽極處理,使其表面生成緻密氧化膜並具有奈米級孔洞,再經過熱處理退火製程,使表面氧化膜由非晶質相(amorphous)轉變為銳鈦相(anatase),然後以SEM、EDS、XRD等儀器觀察其各種狀態下之形貌及性質。交流阻抗分析法主要測試儀器為頻率響應分析儀(Frequency Response Analyzer)和恆電流電位儀(Potentionstat),分析結果可以發現銳鈦相之二氧化鈦奈米管具有較緻密且穩定高抗腐蝕的性質。最後再配合MTT assay檢測,以培養類骨母細胞MG-63的OD值對銳鈦相與非晶質鈦試片表面上的增殖(proliferation)活性程度作結果比較,發現anatase相試片在細胞增殖上較amorphous試片要來得好。
This study recorded the data of Electrochemical Impedance Spectroscopy (EIS) for amorphous and anatase ATO (anodic titanium oxide) nanotubes formed on the surfaces of titanium substrates, and prepared the Hanks’ solution for a 2-week immersion. These impedance phenomena were revealed by the structural imperfection occurring on the interface of ATO/substrate. Based on the identification of impedance results and structural imperfections, this study proposed the mechanisms to grow ATO nanotubes. The EDS results and expected oxygen pressures dependence of defect structure demonstrated the non-stoichiometric structures on the substrate layers of anatase ATO nanotube, which is expressed as TiO2-x. By decreasing the concentration of oxygen vacancies in the anatase phase, the driving force of anodic dissolution to grow anatase ATO nanotubes is to obtain oxygen from the atmosphere to the oxygen site, if the effect of oxygen partial pressure on the composition is significant. The MTT results of osteoblasts cells on the metallic substrates indicated that anatase ATO shows good cell proliferation as compared to amorphous ATO.
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