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High aspect-ratio polymer nanostructures by tailored capillarity and adhesive force

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Authors
Jeong, Hoon Eui; Lee, Sung Hoon; Kim, Pilnam; Suh, Kahp Y.
Issue Date
2008-02-01
Publisher
Elsevier
Citation
Colloids Surf. A Physicochem. Eng. Asp. 313 (2008) 359
Keywords
GECKO FOOT-HAIRSUPERHYDROPHOBIC SURFACECARBON NANOTUBESSOFT LITHOGRAPHYFABRICATIONDEVICESMICRO
Abstract
We present simple methods for fabricating high aspect-ratio polymer nanostructures on a solid substrate by rigiflex lithography with tailored capillarity and adhesive force. In the first method, a thin, thermoplastic polymer film was prepared by spin coating on a substrate and the temperature was raised above the polymer's glass transition temperature (T-g) while in conformal contact with a poly(urethane acrylate) (PUA) mold having nanocavities. Consequently, capillarity forces the polymer film to rise into the void space of the mold, resulting in nanostructures with an aspect ratio of similar to 4. In the second method, very high aspect-ratio (>20) nanohairs were fabricated by elongating the pre-formed nanostructures upon removal of the mold with the aid of tailored capillarity and adhesive force at the mold/polymer interface. Finally, these two methods were further used to fabricate micro/nano hierarchical structures by sequential application of the molding process for mimicking nature's functional surfaces such as a lotus leaf and gecko foot hairs.
ISSN
0927-7757
Language
English
URI
http://hdl.handle.net/10371/8370
DOI
https://doi.org/10.1016/j.colsurfa.2007.04.163
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Journal Papers (저널논문_기계항공공학부)
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