Xia Kangwei, Liu Chu-Feng, Leong Weng-Hang, Kwok Man-Hin, Yang Zhi-Yuan, Feng Xi, Liu Ren-Bao, Li Quan
Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
The Hong Kong Institute of Quantum Information Science and Technology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
Nat Commun. 2019 Jul 22;10(1):3259. doi: 10.1038/s41467-019-11252-3.
Spatially resolved information about material deformation upon loading is critical to evaluating mechanical properties of materials, and to understanding mechano-response of live systems. Existing techniques may access local properties of materials at nanoscale, but not at locations away from the force-loading positions. Moreover, interpretation of the local measurement relies on correct modeling, the validation of which is not straightforward. Here we demonstrate an approach to evaluating non-local material deformation based on the integration of nanodiamond orientation sensing and atomic force microscopy nanoindentation. This approach features a 5 nm precision in the loading direction and a sub-hundred nanometer lateral resolution, high enough to disclose the surface/interface effects in the material deformation. The non-local deformation profile can validate the models needed for mechanical property determination. The non-local nanometer-precision sensing of deformation facilitates studying mechanical response of complex material systems ranging from impact transfer in nanocomposites to mechano-response of live systems.
加载时材料变形的空间分辨信息对于评估材料的力学性能以及理解生物系统的机械响应至关重要。现有技术可以获取纳米尺度下材料的局部特性，但无法获取远离力加载位置处的特性。此外，局部测量的解释依赖于正确的建模，而其验证并非易事。在此，我们展示了一种基于纳米金刚石取向传感与原子力显微镜纳米压痕相结合来评估非局部材料变形的方法。该方法在加载方向上具有5纳米的精度以及亚百纳米的横向分辨率，足以揭示材料变形中的表面/界面效应。非局部变形轮廓可以验证确定力学性能所需的模型。非局部纳米精度的变形传感有助于研究从纳米复合材料中的冲击传递到生物系统的机械响应等复杂材料系统的机械响应。
