Materials Engineering Research Group, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom.
Langmuir. 2011 May 3;27(9):5644-9. doi: 10.1021/la200527p. Epub 2011 Mar 31.
An alkaline hydrothermal treatment of several types of ordered macroporous TiO(2) structures, namely, microtubes, sea urchin shapes, and anodic nanotube arrays, has been investigated under stationary conditions. The effect of the size and geometry of these structures on the morphology of the forming hierarchical agglomerates of titanate nanotubes has been systematically studied. It has been revealed that, at sizes larger than the critical value (ca. 1 μm), the whole geometry of the initial ordered TiO(2) structure is maintained under reaction conditions leading to formation of hierarchical structures, in which bulk TiO(2) is replaced with titanate nanotube agglomerates. This principle provides a convenient route for the preparation of multiscale micro- and nanostructures of TiO(2) based materials. The analysis of critical size suggests that, under reaction conditions, due to the limited transport of dissolved Ti(IV) species, the growth of nanotubes occurs locally.
已经在静态条件下对几种类型的有序大孔 TiO(2) 结构（即微管、海胆形状和阳极纳米管阵列）进行了碱性水热处理。系统研究了这些结构的尺寸和几何形状对形成钛酸盐纳米管的分级聚集体形态的影响。结果表明，在大于临界值（约 1 μm）的尺寸下，初始有序 TiO(2) 结构的整体几何形状在反应条件下得以保持，从而形成了分级结构，其中大块 TiO(2) 被钛酸盐纳米管聚集体取代。该原理为制备基于 TiO(2) 的多尺度微纳结构提供了一种便捷途径。临界尺寸的分析表明，在反应条件下，由于溶解的 Ti(IV) 物种的传输受限，纳米管的生长是局部发生的。
