Nanoengineered Multiscale Hierarchical Structures with Tailored Wetting Properties

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• 作者：Hoon Eui Jeong ; Sung Hoon Lee ; Jae Kwan Kim ; and Kahp Y. Suh
• 刊名：Langmuir
• 出版年：2006
• 出版时间：February 14, 2006
• 年：2006
• 卷：22
• 期：4
• 页码：1640 - 1645
• 全文大小：837K
• 年卷期：v.22,no.4(February 14, 2006)
• ISSN：1520-5827

文摘

A simple method for fabricating micro/nanoscale hierarchical structures is presented using a two-step temperature-directed capillary molding technique. This lithographic method involves a sequential application of the moldingprocess in which a uniform polymer-coated surface is molded with a patterned mold by means of capillary force abovethe glass transition temperature of the polymer. Various microstructures and nanostructures were fabricated withminimum resolution down to ~50 nm with good reproducibility. Also contact angle measurements of water indicatedthat two wetting states coexist on a multiscale hierarchical structure where heterogeneous wetting is dominant for themicrostructure and homogeneous wetting for the nanostructure. A simple theoretical model combining these twowetting states was presented, which was in good agreement with the experimental data. Using this approach, multiscalehierarchical structures for biomimetic functional surfaces can be fabricated with precise control over geometricalparameters and the wettability of a solid surface can be tailored in a controllable manner.