论文标题
模型胶体单晶的机械性能
Mechanical properties of model colloidal mono-crystals
论文作者
论文摘要
我们研究了由高度单分散液滴制成的二维无缺陷单晶的弹性和屈服特性。晶体在两个平行边界之间被压缩，其中一个平行边界充当力传感器。随着边界之间的可用空间减少，晶体通过连续的排还原过渡。 对于小压缩力，晶体会弹性地响应，直到达到临界力并在单个灾难性的全球事件中骨折为止。相应地，与每个排还原相关的力测量峰。理想的单晶样品的弹性特性通过由单个毛细管弹簧组成的简单分析模型完全捕获。用最小的键断裂模型捕获晶体的屈服特性。
We investigate the elastic and yielding properties of two dimensional defect-free mono-crystals made of highly monodisperse droplets. Crystals are compressed between two parallel boundaries of which one acts as a force sensor. As the available space between boundaries is reduced, the crystal goes through successive row-reduction transitions. For small compression forces, the crystal responds elastically until a critical force is reached and the assembly fractures in a single catastrophic global event. Correspondingly there is a peak in the force measurement associated with each row-reduction. The elastic properties of ideal mono-crystal samples are fully captured by a simple analytical model consisting of an assembly of individual capillary springs. The yielding properties of the crystal are captured with a minimal bond breaking model.
