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Ron Fearing work on: Synthetic Gecko Spatula Array Fabrication

Ron Fearing work on: Synthetic Gecko Spatula Array Fabrication. http://robotics.eecs.berkeley.edu/~ronf/GECKO/index.html M. Sitti and R.S. Fearing. “ Nanomolding Based Fabrication of Synthetic Gecko Foot-Hairs ,” 2nd IEEE Conf. On Nanotechnology, Washington, D.C. August 26-28, 2002

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Ron Fearing work on: Synthetic Gecko Spatula Array Fabrication

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  1. Ron Fearing work on: Synthetic Gecko Spatula Array Fabrication • http://robotics.eecs.berkeley.edu/~ronf/GECKO/index.html • M. Sitti and R.S. Fearing. “Nanomolding Based Fabrication of Synthetic Gecko Foot-Hairs,”2nd IEEE Conf. On Nanotechnology, Washington, D.C. August 26-28, 2002 • (http://robotics.EECS.Berkeley.EDU/~ronf/PAPERS/nano_02.pdf) • News Links: http://www.lclark.edu/faculty/autumn/geckonews.html

  2. Design criterion based on Full papers • K. Autumn, and et. al. “Adhesive force of a single gecko foot-hair,” Nature, vol. 405, pp. 681-685, June 8 2000 • Compliant, dry micro/nanoscale, high aspect ratio beta-keratin structures • Hairs go from stalks (micrometer scale) to spatular stalks (nanometer scale) by branching • K. Autumn, M. Sitti, Y. Liang, and et. al. “Evidence for van der Waals attachment by gecko foot-hairs inspires design of synthetic adhesive,” Proc. Of the National Academy of Sciences, 2002. • Hairs adhere to surfaces via molecular forces such as Van der Waals Thus the focus of this paper is the fabrication of spatular and setal stalks through Nanomolding

  3. Fabrication Methods

  4. Nanorobotic Imprinting • Single Atomic Force Microscope (AFM) • Used to imprint flat wax surface • Molded with polymer and then separated by peeling

  5. Polycarbonate • Used to produce hairs that are shorter and less dense • Hairs have large diameter (6 µm) and low adhesion (60nN) Parallel Fabrication • Alumina • Wet-etching combined with length leads to hydrophobic hairs sticking together

  6. Method I Relatively indedpendent of material properties Repeatable Consistent with standard adhesive model Method II Potential for mass production Further optimization such as length and density &/or external excitation (such as ultrasonic vibration) or surfactant for etchtant to minimize hydrophobic attraction Conclusions Spatulae on a single gecko seta. (K. Autumn, E. Florance)

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