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作者Piorkowski, Dakota;Liao, Chen-Pan;Joel, Anna-Christin;Wu, Chung-Lin;Doran, Niall;Blamires, Sean J.;Pugno, Nicola M.;Tso, I-Min
出版日期202102
著作名稱Adhesion of spider cribellate silk enhanced in high humidity by mechanical plasticization of the underlying fiber
刊名Journal of the Mechanical Behavior of Biomedical Materials
114
頁數104200
被收錄索引SCI
主題動物
關鍵字Silk, Spider, Adhesion, Biological material
摘要The disruptive nature of water presents a significant challenge when designing synthetic adhesives that maintain functionality in wet conditions. However, many animal adhesives can withstand high humidity or underwater conditions, and some are even enhanced by them. An understudied mechanism in such systems is the influence of material plasticization by water to induce adhesive work through deformation. Cribellate silk is a dry adhesive used by particular spiders to capture moving prey. It presents as a candidate for testing the water plasticization model as it can remain functional at high humidity despite lacking an aqueous component. We performed herein tensile and adhesion tests on cribellate threads from the spider, Hickmania troglodytes; a spider that lives within wet cave environments. We found that the work of adhesion of its cribellate threads increased as the axial fibre deformed during pull-off experiments. This effect was enhanced when the silk was wetted and as spider body size increased. Dry threads on the other hand were stiff with low adhesion. We rationalized our experiments by a series of scaling law models. We concluded that these cribellate threads operate best when the nanofibrils and axial fibers both contribute to adhesion. Design of future synthetic materials could draw inspiration from how water facilitates, rather than diminishes, cribellate silk adhesion.
資料連結Full Text
DOI10.1016/j.jmbbm.2020.104200
系統號NO000006318

May 10 2024 17:17:25
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