海上自修复丝：螺旋分层结构在Pinna nobilis byssus力学中的作用。,Soft Matter

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海上自修复丝：螺旋分层结构在Pinna nobilis byssus力学中的作用。
Soft Matter ( IF 2.9 ) Pub Date : 2019-11-07 , DOI: 10.1039/c9sm01830a
Delphine Pasche ₁ , Nils Horbelt ₁ , Frédéric Marin ₂ , Sébastien Motreuil ₂ , Peter Fratzl ₁ , Matthew J Harrington ₃

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贻贝贻贝种的底肌纤维由于其令人印象深刻的特性（例如高韧性，自修复性）而已成为生物启发材料研究的重要榜样。但是，Mytilids只占所有产双壳类双壳类动物的一小部分。最近的研究表明，来自其他物种的扁桃体具有完全不同的蛋白质组成和层次结构。在这方面，Pinna nobilis byssus尤其有趣，因为它的形态，功能和在编织轻质金色织物（称为海丝）方面的历史用途非常不同。诺比利斯对虾最近发现byssus由组织成螺旋状蛋白质超结构的球形蛋白质组成。在这项工作中，我们正在调查这个层次结构和力学性能之间的关系P.扇贝足丝，包括耗能和自愈能力。为了实现这一目标，我们进行了深入的机械表征，以及与原位X射线散射相结合的拉伸测试。我们的研究结果表明，P.扇贝足丝，像紫，具有自我修复和能量阻尼行为和初始弹性行为P.鳙比索是由于先前观察到的包括比索的螺旋结构块的拉伸和散开而引起的。这些发现对于了解贻贝不同物种的趋同进化以及生物学启发的材料领域具有生物学意义。

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Self-healing silk from the sea: role of helical hierarchical structure in Pinna nobilis byssus mechanics.

The byssus fibers of Mytilus mussel species have become an important role model in bioinspired materials research due to their impressive properties (e.g. high toughness, self-healing); however, Mytilids represent only a small subset of all byssus-producing bivalves. Recent studies have revealed that byssus from other species possess completely different protein composition and hierarchical structure. In this regard, Pinna nobilis byssus is especially interesting due to its very different morphology, function and its historical use for weaving lightweight golden fabrics, known as sea silk. P. nobilis byssus was recently discovered to be comprised of globular proteins organized into a helical protein superstructure. In this work, we investigate the relationships between this hierarchical structure and the mechanical properties of P. nobilis byssus threads, including energy dissipation and self-healing capacity. To achieve this, we performed in-depth mechanical characterization, as well as tensile testing coupled with in situ X-ray scattering. Our findings reveal that P. nobilis byssus, like Mytilus, possesses self-healing and energy damping behavior and that the initial elastic behavior of P. nobilis byssus is due to stretching and unraveling of the previously observed helical building blocks comprising the byssus. These findings have biological relevance for understanding the convergent evolution of mussel byssus for different species, and also for the field of bio-inspired materials.

更新日期：2019-11-07

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