Abstract
We report that the water repellency of polymeric film surfaces can be simply tuned by pressing softened polymer films into porous anodized aluminum oxide (AAO) templates. Highly-dense nano-pillars and nano-hairs on the polymer surfaces are reproduced via physically or chemically separating the AAO templates from the impressed polymer films. The resulting polymeric nano-textures show various aspect ratios (ARs) between height and cross-sectional diameter (from 2 to 130), depending on the viscoelastic response of the polymer chains during hot AAO pressing and the subsequent separation procedures. The water contact angle values on the nano-textured polymer films considerably changed from 91° to 160° with an increase in AR. Using hot pressing and physical detachment of a porous AAO-covered Al cylinder roller, we successfully demonstrated the potential for large-area fabrication of superhydrophobic polymer films with characteristics that are similar to lotus leaves.
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Acknowledgments: This work was supported by grants from the Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program (10062082) and the Industrial Fundamental Technology Development Program (10052893).
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Choi, H., Lee, S., Park, S.H. et al. Water repellency of large-scale imprinting-assisted polymer films. Macromol. Res. 25, 584–590 (2017). https://doi.org/10.1007/s13233-017-5103-z
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DOI: https://doi.org/10.1007/s13233-017-5103-z