Formation of grid-like mesoporous titania film via structural transformation and its surface superhydrophilicity conversion
- 材料学院－已发表论文 
Thin titania film with accessible and grid-like porosity was formed via structural transformation from a large-pore (similar to 10 nm) 3D hexagonal (P6(3)/mmc) mesoporous titania thin film. The intermediate 3D hexagonal mesoporous titania thin film (MTF) was synthesized using a tetrabutyl titanate (TBT)-P123-BuOH-HCl system by the combination of dip-coating and evaporation-induced self-assembly (EISA). The MTF calcined at 350 degrees C exhibited an ordered honeycomb arrangement over the entire top surface and an ABAB stacking sequence in the cross-section. After being calcined at 450 degrees C, the 3D hexagonal mesostructure was transformed to a grid-like mesostructure with quasi-perpendicular porosity through sintering-diffusion and pore merging along the c-axis. The accessibility of this grid-like structure estimated by the adsorption of TIRON (disodium 1,2-dihydroxybenzene, 3,5-disulfonate) was higher than that of intermediate structure. And an interesting finding was that, after structural transformation, the surface wettability changed from hydrophilic to superhydrophilic even without UV irradiation. This phenomenon could be properly explained by the increased accessibility and surface roughness of grid-like structure. (c) 2012 Elsevier B.V. All rights reserved.
CitationSURFACE & COATINGS TECHNOLOGY,2012,207:34-41