Journal
NANOSCALE
Volume 4, Issue 3, Pages 768-772Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1nr11369k
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Funding
- National Basic Research Program of China [2010CB934700]
- National Natural Science Foundation of China [21001013, 20974113, 20920102036]
- Specialized Research Fund for the Doctoral Program of Higher Education
- Fundamental Research Funds for the Central Universities
- Program for New Century Excellent Talents in University
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Functional integration is an inherent characteristic for multiscale structures of biological materials. In this contribution, we first investigate the liquid-solid adhesive forces between water droplets and superhydrophobic gecko feet using a high-sensitivity micro-electromechanical balance system. It was found, in addition to the well-known solid-solid adhesion, the gecko foot, with a multiscale structure, possesses both superhydrophobic functionality and a high adhesive force towards water. The origin of the high adhesive forces of gecko feet to water could be attributed to the high density nanopillars that contact the water. Inspired by this, polyimide films with gecko-like multiscale structures were constructed by using anodic aluminum oxide templates, exhibiting superhydrophobicity and a strong adhesive force towards water. The static water contact angle is larger than 150 degrees and the adhesive force to water is about 66 mu N. The resultant gecko-inspired polyimide film can be used as a mechanical hand to snatch micro-liter liquids. We expect this work will provide the inspiration to reveal the mechanism of the high-adhesive superhydrophobic of geckos and extend the practical applications of polyimide materials.
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