Protective coatings on extensible biofibres
Protective coatings on extensible biofibres
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DOI：
10.1038/nmat1956
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发表时间：
2007-09-01
期刊：
影响因子：
41.2
通讯作者：
Zok, Frank W.
中科院分区：
文献类型：
--
作者：
Holten-Andersen, Niels;Fantner, Georg E.;Zok, Frank W.
配制用于纳米和生物技术的有效涂料带来了相当大的技术挑战（1）。如果要提供耐磨性，涂层必须坚硬并与下面的基材（2）良好粘附。然而，高硬度是以牺牲延展性为代价的（3，4）。这种性能折衷使得即使是适度柔顺的基底的涂层设计也是有问题的，因为基底变形容易超过涂层的应变极限（5）。虽然合成纤维涂层的最高应变能力小于10%，但可变形涂层在生物系统中普遍存在（3，6）。为了吸取自然界的教训，对贻贝Mytilus galloprovincialis和佩尔纳canaliculus两种贝类的丝状体表皮进行了研究。与它们保护丝足丝芯中的胶原纤维的功能一致，这些涂层显示出与工程塑料相当的硬度和刚度，并且还具有令人惊讶的可延展性; P. canaliculus角质层的拉伸破坏应变为约30%，而M. galloprovincialis是一个显着的70%。伸展性的差异归因于M角质层内可变形的微相分离颗粒的存在。galloprovincialis。研究结果对仿生可延展涂层的设计具有重要意义。
Formulating effective coatings for use in nano- and biotechnology poses considerable technical challenges(1). If they are to provide abrasion resistance, coatings must be hard and adhere well to the underlying substrate(2). High hardness, however, comes at the expense of extensibility(3,4). This property trade-off makes the design of coatings for even moderately compliant substrates problematic, because substrate deformation easily exceeds the strain limit of the coating(5). Although the highest strain capacity of synthetic fibre coatings is less than 10%, deformable coatings are ubiquitous in biological systems(3,6). With an eye to heeding the lessons of nature, the cuticular coatings of byssal threads from two species of marine mussels, Mytilus galloprovincialis and Perna canaliculus, have been investigated. Consistent with their function to protect collagenous fibres in the byssal-thread core, these coatings show hardness and stiffness comparable to those of engineering plastics and yet are surprisingly extensible; the tensile failure strain of P. canaliculus cuticle is about 30% and that of M. galloprovincialis is a remarkable 70%. The difference in extensibility is attributable to the presence of deformable microphase-separated granules within the cuticle of M. galloprovincialis. The results have important implications in the design of bio-inspired extensible coatings.