Regulation of the Physical Characteristics of Titania Nanotube Aggregates Synthesized from Hydrothermal Treatment
Regulation of the Physical Characteristics of Titania Nanotube Aggregates Synthesized from Hydrothermal Treatment
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DOI：
10.1021/cm049643u
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发表时间：
2004-10
影响因子：
8.6
通讯作者：
Chien-Cheng Tsai;H. Teng
中科院分区：
文献类型：
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作者：
Chien-Cheng Tsai;H. Teng
采用NaOH水热法对商业TiO 2颗粒进行处理，然后用盐酸洗涤，制备了具有不同孔隙率的TiO 2纳米管聚集体。孔结构分析表明，较小尺寸的孔主要由纳米管贡献，而较大尺寸的孔主要由聚集体的空隙区域贡献。水热处理温度在110 - 150 °C范围内，不仅影响颗粒到片状转化的程度，从而影响纳米管的最终结构，而且还影响高温下锐钛矿到金红石的转化。纳米管聚集体的表面积随着处理温度的升高而增加，达到最大值约为0.001。400 m2/g，然后随着温度的进一步升高而降低。在HCl洗涤中，电荷去除速率和TiO 2上的静电荷的最终状态都影响TiO 2片成纳米管的滚动。这表明纳米管的结构可以通过调节温度来调节。
Titania nanotube aggregates with different porosities were prepared from hydrothermal treatment on commercial TiO2 particles in NaOH followed by HCl washing. Pore structure analysis reflects that pores of smaller sizes are mainly contributed by the nanotubes while those of larger sizes are contributed by the interspace region of the aggregates. The hydrothermal treatment temperature, ranging within 110−150 °C, was shown to affect not only the extent of particle-to-sheet conversion, and thus the resulting structures of the nanotubes, but also the anatase-to-rutile transformation at high temperatures. The surface area of the nanotube aggregates increases with the treatment temperature to reach a maximum of ca. 400 m2/g at 130 °C, and then decreases with further increase of the temperature. In HCl washing, both the charge-removal rate and final state of the electrostatic charges on TiO2 affect the rolling of TiO2 sheets into nanotubes. This demonstrates that the nanotube structure can be regulated by adjusti...