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Hybrid Surface Patterns Mimicking the Design of the Adhesive Toe Pad of Tree Frog

  • Biological materials achieve directional reinforcement with oriented assemblies of anisotropic building blocks. One such example is the nanocomposite structure of keratinized epithelium on the toe pad of tree frogs, in which hexagonal arrays of (soft) epithelial cells are crossed by densely packed and oriented (hard) keratin nanofibrils. Here, a method is established to fabricate arrays of tree-frog-inspired composite micropatterns composed of polydimethylsiloxane (PDMS) micropillars embedded with polystyrene (PS) nanopillars. Adhesive and frictional studies of these synthetic materials reveal a benefit of the hierarchical and anisotropic design for both adhesion and friction, in particular, at high matrix–fiber interfacial strengths. The presence of PS nanopillars alters the stress distribution at the contact interface of micropillars and therefore enhances the adhesion and friction of the composite micropattern. The results suggest a design principle for bioinspired structural adhesives, especially for wet environments.

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Document Type:Article
Author:Longjian XueORCiD, Belén Sanz, Aoyi Luo, Kevin T. Turner, Xin Wang, Di Tan, Rui Zhang, Hang Du, Martin Steinhart, Carmen Mijangos, Markus Guttmann, Michael Kappl, Aránzazu del Campo BécaresORCiD
Parent Title (English):ACS Nano
First Page:9711
Last Page:9719
Year of first Publication:2017
Release Date:2022/11/18
Impact:13.709 (2017)
Scientific Units:Dynamical Biomaterials
Open Access:Open Access
Signature:INM 2017/088
Licence (German):License LogoUrheberrechtlich geschützt