Fabrication and adhesion of hierarchical micro-seta |
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Authors: | Hao Zhang LianWei Wu ShiXing Jia DongJie Guo ZhenDong Dai |
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Institution: | [1]Institute of Bio-inspired Structure and Surface Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China [2]The 55th Research Institute of Ministry of the Electronics Industry, Nanjing 210016, China |
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Abstract: | Spark-erosion perforating technology was used to fabricate a Cu-based template characterized by pores with radius of 0.5 mm
inclined at 75°. A commercial silicone elastomer of poly(dimethylsiloxane) (PDMS) with a rich Si-H content was used to produce
an inclined array of primary setae. The technique of argon ion plasma etching on crystalline silicon was used to fabricate
negative templates with radii of 5, 10, and 20 μm. The Si-H rich PDMS was used to cast three types of fine array templates,
which acted as the secondary setae. A vinyl-rich PDMS precursor was used to bind the primary and secondary setae by a hydrosilylation
reaction, thus allowing the formation of three different hierarchical arrangements of setae. Adhesion tests demonstrated that
shear adhesion was anisotropic, first increasing in strength then decreasing to a stable level as slippage occurred. The adhesion
strength was significantly influenced by the nature of the secondary setae, showing a strong correlation with aspect-ratio
and concentration. |
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Keywords: | seta poly(dimethylsiloxane) adhesion hierarchical structure |
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