Evolution of Standing Mesochannels on Porous Anodic Alumina Substrates with Designed Conical Holes

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• 作者：Yusuke Yamauchi ; Tomota Nagaura ; Ayako Ishikawa ; Toyohiro Chikyow ; Satoru Inoue
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：August 6, 2008
• 年：2008
• 卷：130
• 期：31
• 页码：10165-10170
• 全文大小：433K
• 年卷期：v.130,no.31(August 6, 2008)
• ISSN：1520-5126

文摘

We report the formation of standing mesochannels simply by spin-coating a precursor solution onto a PAA (porous anodic alumina) substrate with designed conical holes, utilizing exactly the same precursors and reaction conditions that form two-dimensional (2D) hexagonal mesoporous SBA-15-type films. When the aspect ratios of the conical holes are lower, the sponge-like mesopores are generated within the conical holes. Such a formation of sponge-like mesostructures truly acts as a trigger for the evolution of perpendicularly oriented and tilted mesochannels. On the other hand, when the PAA substrates with high-aspect cones are used, the mesochannels are stacked like a doughnut within the conical holes, which leads to parallel orientations of the mesochannels in the continuous film region.