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首页> 外文期刊>Advanced Functional Materials >Biogenic Crystallographically Continuous Aragonite Helices: The Microstructure of the Planktonic Gastropod Cuvierina
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Biogenic Crystallographically Continuous Aragonite Helices: The Microstructure of the Planktonic Gastropod Cuvierina

机译：生物成晶体连续文石螺旋：浮游性腹足纲Cuvierina的微观结构。

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摘要

The pteropod Cuvierina constructs very lightweight, thin, flexible, and resistant shells with the most unusual microstructure: densely packed, continuous crystalline aragonite fibers that coil helically around axes perpendicular to the shell surface. The high degree of fiber intergrowth results in a particular interlocking structure. The shell is constructed by guided self-assembly, outside the animal's soft body. A prerequisite to understand its formation is to resolve the underlying crystallographic building principle. This is basic in order to use this hierarchically structured and highly functional biomaterial as inspiration for the production of new materials. It teaches us about the optimization of structures over millions of years of evolution under strict consideration of energetic costs and efficient use of available resources and materials. We have described how helical coiling proceeds by using a combination of diffraction and imaging techniques, which complement at different levels of resolution. Despite their curling, the fibers are continuously crystalline and show a preferred crystallographic growth direction. When the latter can no more be maintained due to the imposed curving, abrupt changes across twins permit to continue growth in the desired direction. This is a nice example of how crystallographically continuous fibers can grow helically.
机译：翼足类Cuvierina构造出非常轻便，薄，柔韧且具有抵抗力的外壳，具有最不寻常的微观结构：密集堆积的连续结晶文石纤维，螺旋状绕垂直于外壳表面的轴盘绕。高度的纤维共生导致特定的互锁结构。外壳是通过引导自组装在动物的软体外部构造而成的。理解其形成的先决条件是解决潜在的晶体学构建原理。为了使用这种层次结构和功能强大的生物材料作为生产新材料的灵感，这是基础。它教会了我们关于如何严格考虑能源成本以及有效利用可用资源和材料在数百万年的发展过程中进行结构优化的知识。我们已经描述了如何通过使用衍射和成像技术的组合来进行螺旋盘绕，这两种技术在不同的分辨率水平上互为补充。尽管它们卷曲，但纤维是连续结晶的并显示出优选的晶体学生长方向。当由于施加的弯曲而无法再维持后者时，双胞胎之间的突然变化允许沿所需方向继续生长。这是结晶连续纤维如何螺旋生长的一个很好的例子。

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