树蛙
材料科学
胶粘剂
复合材料
曲面(拓扑)
树(集合论)
纳米技术
数学
几何学
生物
图层(电子)
生态学
组合数学
作者
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
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-09-08
卷期号:11 (10): 9711-9719
被引量:127
标识
DOI:10.1021/acsnano.7b04994
摘要
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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