珍珠的中尺度结晶度

J. Gim, Alden Koch, L. Otter, B. Savitzky, S. Erland, L. Estroff, Dorrit Jacob, R. Hovden
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引用次数: 0

摘要

珍珠独特的美丽和韧性归功于文石片的周期性堆积,即珠层。珍珠质是一种自然产生的中晶,在没有平移对称的情况下显著地出现。收集珍珠的鼓舞人心的生物矿物设计需要量化其结构一致性和理解控制形成的随机过程。通过高分辨率表征珍珠的整个结构(~ 3mm),我们发现珍珠是一种通过纳米颗粒组装过程形成的中等范围的介晶。自我纠正生长机制积极地弥补片剂的无序和拓扑缺陷,并对准结晶性(即远程无序)起抵消作用。尽管存在持续的波动和拓扑缺陷,珍珠层的相关长度约为16片(~5.5µm)。对于较长距离(bbb25片,~8.5 μ m),珠光片的频谱遵循f-1.5行为,表明生长与外部随机过程相耦合-这是在不同的自然现象中发现的普遍性,现在包括珍珠。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Mesoscale Crystallinity of Nacreous Pearls
A pearl’s distinguished beauty and toughness is attributable to the periodic stacking of aragonite tablets known as nacre. Nacre is a naturally occurring mesocrystal that remarkably arises in the absence of translational symmetry. Gleaning the inspiring biomineral design of a pearl requires quantifying its structural coherence and understanding the stochastic processes that govern formation. By characterizing the entire structure of pearls (~3 mm) in cross-section at high resolution, we show nacre is a medium-range mesocrystal formed through nanoparticle assembly processes. Self-correcting growth mechanisms actively remedy disorder and topological defects of the tablets and act as a countervailing force to paracrystallinity (i.e. long-range disorder). Nacre has a correlation length of roughly 16 tablets (~5.5 µm) despite persistent fluctuations and topological defects. For longer distances (> 25 tablets, ~8.5 µm), the frequency spectrum of nacre tablets follows f-1.5 behavior suggesting growth is coupled to external stochastic processes—a universality found across disparate natural phenomena which now includes pearls.
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