Nacre, also known as mother of pearl, possesses extraordinary mechanical properties resulting from its intriguing hierarchical brick-and-mortar microstructures. Despite prior studies, interactions between nanoasperities during sliding still need to be elucidated. In this study, we measure slip events between nanograins of microlayers at high temporal resolution during torsion-induced sliding. We model the slips as avalanches caused by interactions of atoms on nanograin surfaces, from which power laws and scaling functions describing statistics and dynamics of slip events are studied. The largest avalanche occurs when nanograins leave each other after the maximum contact. The agreement between measurements and predictions shows that avalanches act essentially in the inhomogeneous sliding of nacreous tablets. Further insights into nanofriction provided in this work may lead to the development of nanoscale tribological systems.

中文翻译：

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在珍珠片之间滑动雪崩。

珍珠母，也被称为珍珠母，由于其有趣的分层实体结构而具有非凡的机械性能。尽管有先前的研究，滑动过程中纳米粗糙体之间的相互作用仍需要阐明。在这项研究中，我们在扭转诱导的滑动过程中以高时间分辨率测量了微层纳米颗粒之间的滑动事件。我们将滑移建模为由纳米颗粒表面上的原子相互作用引起的雪崩，从中研究了描述滑移事件统计和动力学的幂律和缩放函数。最大的雪崩发生在纳米颗粒在最大接触后彼此离开时。测量值与预测值之间的一致性表明，雪崩主要作用于珍珠质片剂的不均匀滑动。