Vertical anisotropic microfibers for a gecko-inspired adhesive

Langmuir : the ACS Journal of Surfaces and Colloids
John TamelierKimberly Turner

Abstract

Geckos are able to adhere strongly and release easily from surfaces because the structurally anisotropic fibers on their toes naturally exhibit force anisotropy based on the direction of articulation. Here, semicircular fibers, with varying amounts of contact area on the two faces, are investigated to ascertain whether fiber shape can be used to gain anisotropy in shear and shear adhesion forces. Testing of 10-μm-diameter polydimethylsiloxane (PDMS) fibers against a 4-mm-diameter flat glass puck show that shear and shear adhesion forces were two to five times greater when in-plane movement caused the flat face, rather than the curved face, of the fiber to come in contact with the glass puck. The directional adhesion and shear force anisotropy results are close to theoretical approximations using the Kendall peel model and clearly demonstrate how fiber shape may be used to influence the properties of the adhesive. This result has broad applicability, and by combining the results shown here with other current vertical and angled designs, synthetic adhesives can be further improved to behave more like their natural counterparts.

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Citations

Mar 19, 2014·Soft Matter·Zhengzhi WangXiaoping Wu
Jul 12, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Jing YuJacob N Israelachvili
Jul 24, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·John TamelierKimberly L Turner
Feb 24, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Longjian XueAranzazu Del Campo
Jul 15, 2015·ACS Applied Materials & Interfaces·Yasong LiCarlo Menon
Oct 8, 2016·Proceedings. Mathematical, Physical, and Engineering Sciences·R Ledesma-AlonsoC Poulard
Dec 31, 2016·ACS Applied Materials & Interfaces·Yue WangDan Sameoto
Apr 12, 2017·ACS Applied Materials & Interfaces·Nicholas CadirovJacob N Israelachvili
Aug 1, 2019·Journal of the Royal Society, Interface·Jamie A BoothKimberly L Foster
Oct 5, 2013·Bioinspiration & Biomimetics·Walid Bin Khaled, Dan Sameoto
Apr 9, 2019·Journal of the Royal Society, Interface·Srinivasan A SureshElliot W Hawkes
Jan 14, 2021·Journal of the Royal Society, Interface·Srinivasan A SureshMark R Cutkosky
Apr 16, 2021·Scientific Reports·N MengaG Carbone
Sep 3, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Longjian XueAránzazu del Campo

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