Jeong Hoon Eui, Lee Sung Hoon, Kim Jae Kwan, Suh Kahp Y
School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Korea.
Langmuir. 2006 Feb 14;22(4):1640-5. doi: 10.1021/la0526434.
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 molding process in which a uniform polymer-coated surface is molded with a patterned mold by means of capillary force above the glass transition temperature of the polymer. Various microstructures and nanostructures were fabricated with minimum resolution down to approximately 50 nm with good reproducibility. Also contact angle measurements of water indicated that two wetting states coexist on a multiscale hierarchical structure where heterogeneous wetting is dominant for the microstructure and homogeneous wetting for the nanostructure. A simple theoretical model combining these two wetting states was presented, which was in good agreement with the experimental data. Using this approach, multiscale hierarchical structures for biomimetic functional surfaces can be fabricated with precise control over geometrical parameters and the wettability of a solid surface can be tailored in a controllable manner.
本文提出了一种利用两步温度导向毛细管成型技术制造微/纳米级分层结构的简单方法。这种光刻方法包括依次进行成型过程，其中在高于聚合物玻璃化转变温度的条件下，通过毛细管力用图案化模具对均匀涂覆聚合物的表面进行成型。制备出了各种微结构和纳米结构，最小分辨率低至约50 nm，且具有良好的重现性。水的接触角测量表明，在多尺度分层结构上存在两种润湿状态，其中微观结构以非均匀润湿为主，纳米结构以均匀润湿为主。提出了一个结合这两种润湿状态的简单理论模型，该模型与实验数据吻合良好。利用这种方法，可以精确控制几何参数来制造用于仿生功能表面的多尺度分层结构，并且可以以可控方式调整固体表面的润湿性。
