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Tough and Strong: Cross-Lamella Design Imparts Multifunctionality to Biomimetic Nacre.
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsnano.0c01511
Hemant Kumar Raut 1, 2 , Alan F Schwartzman 1 , Rupambika Das 2 , Fan Liu 3 , Lifeng Wang 3 , Caroline A Ross 1 , Javier G Fernandez 2
Affiliation  

The creation of structural composites with combined strength, toughness, low density, and biocompatibility remains a long-standing challenge. On the other hand, bivalve marine shells—Clinocardiumspp.—exhibit strength, stiffness, and toughness that surpass even that of the nacre that is the most widely mimicked model for structural composites. The superior mechanical properties of Clinocardiumspp. shells originate from their cross-lamella design, comprising CaCO3 mineral platelets arranged in an “interlocked” herringbone fashion. Reproduction of such hierarchical designs could offer multifunctionality, potentially combining strength and toughness at low densities, and the capability for seamless integration with biological systems. Here, we demonstrate manufacturing of the cross-lamella design by biomineralizing aragonite films with sawtooth patterns and assembling them in a chitosan/fibroin matrix to generate a composite with interlocked mineral layers. The resultant composite, with a similar constitution to that of the biological counterpart, nearly doubles the strength of previous nacre-mimetic composites while improving the tensile toughness and simultaneously exhibiting stiffness and biocompatibility.

中文翻译:

坚韧而坚固:跨层板设计将仿生珍珠母的多功能性发挥到极致。

具有强度,韧性,低密度和生物相容性的结构复合材料的创造仍然是一项长期的挑战。另一方面,双壳类海洋贝壳-斜柏-展现出的强度,刚度和韧性甚至超过珍珠母,珍珠母是结构复合材料最广泛模仿的模型。斜柏属植物的优良机械性能贝壳源自其包含CaCO 3的交叉薄片设计矿物血小板以“互锁”的人字形方式排列。此类分层设计的复制可以提供多功能性,并可能在低密度下组合强度和韧性,以及与生物系统无缝集成的能力。在这里,我们演示了通过将具有锯齿形图案的文石薄膜生物矿化并将其组装在壳聚糖/丝素蛋白基质中以生成具有互锁矿物层的复合材料,来制造跨层设计的过程。所得复合材料的结构与生物类似物的结构相似,几乎使以前的珍珠母模拟复合材料的强度提高了一倍,同时提高了拉伸韧性并同时显示出刚度和生物相容性。
更新日期:2020-08-25
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