journal article·2017-10-24Open access

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

Longjian Xue, 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

ACS Nano· Volume 11· Issue 10

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Adhesion, Friction, and Surface Interactions · Surface Modification and Superhydrophobicity · Nanofabrication and Lithography Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany

Instituto de Ciencia y Tecnología de Polímeros, Consejo Superior de Investigaciones Científicas (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain

Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, 220 S. 33rd Street, Philadelphia, Pennsylvania 19104-6315, United States

Institut für Chemie neuer Materialien, Universität Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany

Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

INM − Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany

Chemistry Department, Saarland University, 66123 Saarbrücken, Germany

Funding

Deutsche Forschungsgemeinschaft · National Natural Science Foundation of China · H2020 European Research Council · Central People's Government of the People's Republic of China

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