The rutile/corundum structural transformation which is based on crystallographic shear is discussed in terms of a one-dimensional disorder model. The transformation process is described by a simple model based on the structural relationship between the rutile-type and corundum-type phases. The model is able to handle randomly spaced crystallographic shear planes, the so-called Wadsley defects, ...

Dye-sensitized solar cells (DSSCs) based on hierarchical rutile TiO(2) flower clusters prepared by a facile, one-pot hydrothermal process exhibit a high efficiency. Complex yet appealing rutile TiO(2) flower films are, for the first time, directly hydrothermally grown on a transparent conducting fluorine-doped tin oxide (FTO) substrate. The thickness and density of as-grown flower clusters ca...

The prototypical photocatalyst TiO2 exists in different polymorphs, the most common forms are the anatase- and rutile-crystal structures. Generally, anatase is more active than rutile, but no consensus exists to explain this difference. Here we demonstrate that it is the bulk transport of excitons to the surface that contributes to the difference. Utilizing high -quality epitaxial TiO2 films of...

ont matter & 2012 n.2012.02.009 thors. : wei-mingdeng@f .edu (G. Cao). Abstract Wulff-shaped and nanorod-like nanoporous mesocrystals constructed from ultrathin rutile TiO2 nanowires were successfully fabricated for the first time in the presence of the surfactant sodium dodecyl benzene sulfonate (SDBS). SDBS played a key role in the homoepitaxial selfassembly process, in which titanate nanowir...

The role of nanocrystalline materials in addressing the current challenges in energy storage has attracted large attention. Besides nanostructured B-type TiO 2 [1], being the fifth polymorph of titanium dioxide, Li intercalated nanocrystalline rutile is considered to act as a potential anode in inherently safe secondary Li ion batteries. In contrast to its coarse-grained counterpart, which is e...

Pure nanocrystalline titanium Oxide (TiO2) powder has been synthesized by the sol-gel technique using titanium tetra-isopropoxide as the starting precursor. As-prepared samples were calcined at different temperatures, 400, 600, 800 and 900°C. X-ray diffraction (XRD) analysis was used to find the crystalline structure and changes in the polymorphs with calcination. The as-synthesized TiO2 powder...

The preparation of TiO(2) nanocrystallite powders coated with and without 9 mol% ZnO has been studied for cosmetic applications in sunscreens by a co-precipitation process using TiCl(4) and Zn(NO(3))(2)·6H(2)O as starting materials. XRD results show that the phases of anatase TiO(2) and rutile TiO(2) coexist for precursor powders without added ZnO (T-0Z) and calcined at 523 to 973 K for 2 h. Wh...