Somerville, United States
Somerville, United States

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Ho A.Y.Y.,Ngee Ann Polytechnic | Ho A.Y.Y.,Institute of Materials Research and Engineering of Singapore | Luong Van E.,Institute of Materials Research and Engineering of Singapore | Lim C.T.,LLC ATRM NJ | And 8 more authors.
Journal of Polymer Science, Part B: Polymer Physics | Year: 2014

The super hydrophobic, self-cleaning properties of natural species derive from the fine hierarchical topography evolved on their surfaces. Hierarchical architectures which are function-mimetic of the lotus leaf are here described and created from multi-scale hierarchical assembled templates. The first level of hierarchy was a micromachined dome structure template and the second level of hierarchy was added by layering a thin nanoporous membrane such as porous anodized alumina or an ion track etch membrane. The assembled templates were nanoimprinted by a single step process on thermoplastic films. The wetting angle of the surfaces reached a value of 160° and the self-cleaning behavior was observed. The superhydrophobic behavior remained over 1 year after fabrication, which demonstrates the stability of these polymeric self-cleaning topographies. © 2014 Wiley Periodicals, Inc. J. Polym. Sci. Part B. Polym. Phys. 2014, 52, 603-609 Hierarchical architectures that emulate the function of the lotus leaf are created from multi-scale hierarchical assembled templates directly nanoimprinted on thermoplastic polymers. This hierarchical microsurface and nanosurface topography exhibits a superhydrophobic behavior and self-cleaning properties with static contact angle values up to 160°and contact angle hysteresis below 10°. The superhydrophobic behavior remained more than 1 year after fabrication, which demonstrates the stability of these polymeric self-cleaning topographies. © 2014 Wiley Periodicals, Inc.

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