期刊
LANGMUIR
卷 28, 期 4, 页码 2181-2186出版社
AMER CHEMICAL SOC
DOI: 10.1021/la203853r
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资金
- National Research Foundation of Korea (NRF) [20110017530]
- World Class University (WCU) [R31-2008-000-10083-0]
- Basic Science Research Program [2010-0027955]
- Korea Research Foundation [KRF-J03003]
- Institute of Advanced Machinery and Design (IAMD)
- Engineering Research Institute of Seoul National University
- National Research Foundation of Korea [2011-0017530, 과C6A1803, R31-2012-000-10083-0, 2009-0094042] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We report an analysis of preload-dependent reversible interlocking between regularly arrayed, high aspect ratio (AR) polymer micro- and nanofibers. Such a reversible interlocking is inspired from the wing-locking device of a beetle where densely populated microhairs (termed microtrichia) on the cuticular surface form numerous hair-to-hair contacts to maximize lateral shear adhesion. To mimic this, we fabricate various high AR, vertical micro- and nanopillars on a flexible substrate and investigate the shear locking force with different preloads (0.1-10 N/cm(2)). A simple theoretical model is developed based on the competition between van der Waals (VdW) attraction and deflection forces of pillars, which can explain the preload-dependent maximum deflection, tilting angle, and total shear adhesion force.
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