期刊
ACS NANO
卷 11, 期 10, 页码 9711-9719出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b04994
关键词
biomimetic; bioinspired adhesives; tree frog; wet adhesives; nanocomposites
类别
资金
- National Natural Science Foundation of China [51503156, 51611530546]
- Young 1000 Talents
- Deutsche Forschungsgemeinschaft within the program Bio-mimetic Materials Research: Functionality by Hierarchical Structuring of Materials [SPP1420, CA880/1, BU 1556/26]
- ITN BioSmarTrainee [642861]
- Marie Sklodowska-Curie Innovative Training School [642861]
- European Research Council (ERC-CoG) [646742]
- Karlsruhe Nano and Micro Facility
- Helmholtz Research Infrastructure at Karlsruhe Institute of Technology
- National Science Foundation [CMMI-1435745, CMMI-1663037]
- European Research Council (ERC) [646742] Funding Source: European Research Council (ERC)
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1435745] Funding Source: National Science Foundation
- Marie Curie Actions (MSCA) [642861] Funding Source: Marie Curie Actions (MSCA)
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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