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

Xue, Longjian; Sanz, Belén; Luo, Aoyi; Turner, Kevin T.; Wang, Xin; Tan, Di; Zhang, Rui; Du, Hang; Steinhart, Martin; Mijangos, Carmen; Guttmann, Markus 1; Kappl, Michael; Campo, Aránzazu del
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


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.

DOI: 10.1021/acsnano.7b04994
Zitationen: 122
Web of Science
Zitationen: 110
Zitationen: 119
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 1936-0851, 1936-086X
KITopen-ID: 1000073776
HGF-Programm 43.22.03 (POF III, LK 01) Printed Materials and Systems
Erschienen in ACS nano
Verlag American Chemical Society (ACS)
Band 11
Heft 10
Seiten 9711-9719
Schlagwörter bioinspired adhesives, biomimetic, nanocomposites, tree frog, wet adhesives
Nachgewiesen in Scopus
Web of Science
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