Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 8, Pages 4225-4230Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3009289
Keywords
biomimetics; interlocking; beetle; nanohairs; dry adhesive
Funding
- National Research Foundation of Korea (NRF) [20110017530]
- WCU (World Class University) program [R31-2008-000-10083-0]
- Basic Science Research Program [2010-0027955]
- Korea Research Foundation Grant [KRF-J03003]
- Global Frontier R&D Program on Center for Multiscale Energy System
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We present bidirectional, asymmetric interlocking behaviors between tilted micro- and nanohair arrays inspired from the actual wing locking device of beetles. The measured shear adhesion force between two identical tilted microhair arrays (1.5 mu m radius, 30 mu m height) turned out to be higher in the reverse direction than that in the angled direction, suggesting that the directionality of beetle's microtrichia may play a critical role in preventing the elytra from shifting along the middle of insect body. Furthermore, we observed dramatic enhancement of shear adhesion using asymmetric interlocking of various nanohair arrays (tilting angle, delta < 40 degrees). A maximum shear locking force of similar to 60 N/cm(2) was measured for the nanohair arrays of 50 nm radius and 1 mu m height with a hysteresis as high as similar to 3. A simple theoretical model was developed to describe the measured asymmetric adhesion forces and hysteresis, in good agreement with the experimental data.
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