Brittle Behavior in Aspirin Crystals: Evidence of Spalling Fracture

Brittle Behavior in Aspirin Crystals: Evidence of Spalling Fracture
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阿司匹林晶体的脆性行为:剥落断裂的证据

DOI:
10.1021/acs.cgd.0c01662
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发表时间:
2021
影响因子:
3.8
通讯作者:
Gabriele B
Gabriele B
中科院分区:
化学2区
文献类型:
--
作者:
Gabriele B

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阿司匹林I型的单晶在其主面上裂开并缩进。在检查时,由于解理后极低的表面粗糙度,可以观察到强烈的各向异性浅横向裂纹。原子力显微镜(AFM)成像显示,剥落的裂缝成核的角隅,形成一个或两个面间距d100的高度梯田。使用附着能的基本计算合理化了阿司匹林中这种剥落断裂的形成,显示了与其相对较高的层内结合相比,(100)层如何结合不良。试图解释这些裂缝沿[010]方向沿着优先扩展进行了讨论。
Single crystals of aspirin form I were cleaved and indented on their dominant face. Upon inspection, it was possible to observe strongly anisotropic shallow lateral cracks due to the extreme low surface roughness after cleavage. Atomic force microscopy (AFM) imaging showed spalling fractures nucleating from the indent corners, forming terraces with a height of one or two interplanar spacingsd100. The formation of such spalling fractures in aspirin was rationalized using basic calculations of attachment energies, showing how (100) layers are poorly bonded when compared to their relatively higher intralayer bonding. An attempt at explaining the preferential propagation of these fractures along the [010] direction is discussed.
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