【摘要】 Ti O2 纳米管为无定形结构 ,焙烧后则由无定形转变为锐钛矿型 ,纳米管的管状结构被破坏 ,晶型转变是 Ti O2 纳米管的管状结构破坏的根本原因 .经热处理 ,原来的 Ti O2 纳米管部分转变为长棒状的金红石型晶柱结构 ,而原料 Ti O2 在较大温度范围内焙烧均未出现长棒状晶柱结构 ;Ti O2 由 A→R的相变温差很大 ,Ti O2 纳米管的 A→ R相变温度比原料约低 3 5 0℃ ;合成的 Ti O2 纳米管的比表面积和孔体积很大 .更多还原

【Abstract】 TiO 2 nanotubes can only exist in the amorphous state, and the tubulous structure of TiO 2 nanotubes is destroyed when the crystalline phase of TiO 2 calcined transforms from amorphous phase into anatase phase. The crystalline phase transformation is the fundamental reason why the tubulous phase strueture is destroyed. It was also found that the long-bar shape crystal columns in rutile were formed when TiO 2 nanotubes were calcined at 700-800 ℃, but the same case didn′t occur to the raw material how high no matter the temperature for calcining was. The temperatures of phase transformation of TiO 2 nanotubes from anatase to rutile is lower than that of the raw material calcined at about 350 ℃. TiO 2 nanotubes have a very large specific surface area and pole volume.更多还原