Force space studies of elastomeric anisotropic fibrillar adhesives [electronic resource]
- Daniel Ruben Soto.
- Physical description
- 1 online resource.
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|3781 2010 S||In-library use|
- Soto, Daniel Ruben.
- Kenny, Thomas William primary advisor.
- Moler, Kathryn A. primary advisor.
- Cutkosky, Mark R. advisor.
- Stanford University. Department of Applied Physics
- Previous research into the climbing ability of the gecko lizard has revealed an adhesive system fundamentally different from existing synthetic adhesives. Instead of using a soft material, the gecko uses a complex system of hairs of beta-keratin, a material that is not tacky. This unique architecture affords the adhesive characteristics that make it well suited for climbing. Borrowing themes from the gecko, we developed a synthetic adhesive possessing similar properties using molded arrays of micron-scale silicone pillars. These arrays demonstrate the gecko property of frictional adhesion where increased shear stress at the interface leads to increased normal load capacity. To distinguish between intrinsic and emergent behavior, we also isolated single pillars to test on a dual-axis force-sensing cantilever capable of micro-Newton resolution. We observed that gecko-like properties were observed for tapered pillars but not for pillars of uniform cross-section. Most synthetic adhesive architectures use a uniform cross-section beam but the results presented here suggest such a design does not capture gecko-like behavior. These results point to ways to optimize the type of adhesion demonstrated by the synthetic dry adhesives and to create adhesives tailored for climbing or static applications.
- Publication date
- Submitted to the Department of Applied Physics.
- Thesis (Ph.D.)--Stanford University, 2010.
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