Modeling Fabrication and Testing of Artificial Gecko Adhesion using Multi Layer Fbrillar Structure

Abstract- The idea of designing a micro level artificial gecko adhesive structure isinspired from ability of geckos to climb any surface. Gecko can climb any rough or smooth surface because of its hierarchical structure present on feet which functions as a smart adhesive [1]. The key parameter that affects gecko adhesion are pattern periodicity of a synthetic setae, hierarchical structure, length, diameter, angle, size, stiffness of end tips and flexibility of a base [2]. The design and fabrication of number of single and multi-level hierarchical pattern were performed. CO2 LASER cutting machine having power of 60 W is used to manufacture moulds. The mould is fabricated from methyl methacrylate sheets of different thickness 3 mm to 10 mm. Liquid silicone polymer PDMS is used as a cast material. Various patterns having dimensionsupto200 micrometer with different tip shapes and geometries were fabricated. For single level patterns like dense pattern, mushroom shape pattern and wedge pattern (lamellar structure) were fabricated. Attempts were made to design and fabricate Multi-level hierarchical structure patterns that mimics gecko like foot structure. These micro level artificial gecko structure have large scope of applications such as climbing robots, non-sticky adhesion tapes, military surveillance and even medical applications.

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Authors: Ameya P. Nijasure, Priam V. Pillai