| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 100 === Nanostructured films have been widely applied for anti-reflective components and self-cleaning functions. Roller embossing is a continuous and efficient productive process for fabrication of nanostructures on polymeric films. There are two common problems: First, producing roller for replicating nanostructure on films mostly relies on the process such as e-beam or focused ion beam. These processes are expensive, complicated and time-consuming. Secondly, the pressure is non-uniform and the contact between the rigid roller and the substrates is almost a line. To solve these problems, this study employs anodic aluminum oxide (AAO) to produce seamless roller with anodic aluminum oxide nanostructures. At the same time, this study develops a gasbag–roller-assisted hot roller embossing process. Nano-pillars structures can be continuously fabricated on PMMA surface by the gasbag-roller-assisted hot roller embossing facility
AAO roller is made from alumina tubes with purities of 99.7%. A facility, which consists of AAO roller, gasbag-roller, pressuring roller, heating component and driving component, is designed and implemented. Nano-pillars structures can be continuously fabricated on PMMA surface by the gasbag-roller-assisted hot roller embossing facility.
With aid of pressure sensitive films, it is observed that gasbag-roller not only increases contact area between roller and substrate but also enhances the uniformity of pressure. Hybrid micro/nano structures on the PMMA have been fabricated with AAO roller mold made from alumina with 99.7% purity, while much more periodic nano-pillars have been fabricated with alumina with 99.999% purity.
Finally, the hydrophobic and anti-reflective characteristic of PMMA with nanostructures have been verified. The contact angle of PMMA with nanostructures is 119.5o while the contact angle of a bare PMMA is 75.9o. Nanostructures on the PMMA also decrease reflective rate from 6% with bare PMMA to 0.2%.This study demonstrates an efficient and low-cost method for fabrication of nano-pillars on polymeric films for hydrophobic and anti-reflective function.
Keyword：Anodic aluminum oxide、hot roller embossing、 gasbag roller、 anti-reflection、hydrophobic
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