Plate, Wire, Mesh, Microsphere, and Microtube Composed of Sodium Titanate Nanotubes on a Titanium Metal Template
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- 作者：Mitsunori Yada ; Yuko Inoue ; Masafumi Uota ; Toshio Torikai ; Takanori Watari ; Iwao Noda ; Takao Hotokebuchi
- 刊名：Langmuir
- 出版年：2007
- 出版时间：February 27, 2007
- 年：2007
- 卷：23
- 期：5
- 页码：2815 - 2823
- 全文大小：1518K
- 年卷期：v.23,no.5(February 27, 2007)
- ISSN：1520-5827
文摘
Sodium titanate nanotube/titanium metal composites were synthesized by hydrothermal treatment of titanium metalswith various morphologies such as plate, wire, mesh, microsphere, and microtube at 160 
C in aqueous NaOH solutionand by the subsequent fixation treatment by calcination at 300 C. The surface of the composite was covered withsodium titanate nanotubes with a diameter of approximately 7 nm, and the core part of the composite was titaniummetal phase. The raw titanium metal acts as a template or a morphology-directing agent of micrometer size or moreto arrange the nanotubes as well as a titanium source for the formation of nanotubes. The concentration of titaniumspecies increases in the reaction solution as the dissolution of titanium metal is accelerated by the reaction betweentitanium and OH-. Furthermore, with an increase in concentration of titanium species in the reaction solution, thetitanium species are reprecipitated as sodium titanate nanotubes onto the titanium metal. Titanium metal with a largesurface area and volume can form sodium titanate nanotubes on the surface of the titanium metal, though titaniummetal with a small volume and surface area tends to dissolve with the hydrothermal treatment. Even in the synthesisusing titanium metal with a small volume and surface area, sodium titanate nanotubes are formed and cover the surfaceof the titanium metal by adding another titanium metal as a source of titanium species in the reaction solution.
C in aqueous NaOH solutionand by the subsequent fixation treatment by calcination at 300 C. The surface of the composite was covered withsodium titanate nanotubes with a diameter of approximately 7 nm, and the core part of the composite was titaniummetal phase. The raw titanium metal acts as a template or a morphology-directing agent of micrometer size or moreto arrange the nanotubes as well as a titanium source for the formation of nanotubes. The concentration of titaniumspecies increases in the reaction solution as the dissolution of titanium metal is accelerated by the reaction betweentitanium and OH-. Furthermore, with an increase in concentration of titanium species in the reaction solution, thetitanium species are reprecipitated as sodium titanate nanotubes onto the titanium metal. Titanium metal with a largesurface area and volume can form sodium titanate nanotubes on the surface of the titanium metal, though titaniummetal with a small volume and surface area tends to dissolve with the hydrothermal treatment. Even in the synthesisusing titanium metal with a small volume and surface area, sodium titanate nanotubes are formed and cover the surfaceof the titanium metal by adding another titanium metal as a source of titanium species in the reaction solution.