Decrease in adhesion force at silica-mica interface with short contact time due to dynamic formation process of liquid bridge revealed on an AFM
Decrease in adhesion force at silica-mica interface with short contact time due to dynamic formation process of liquid bridge revealed on an AFM
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DOI：
10.1080/00218464.2021.1924154
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
Tianmao Lai;Yuguo Chen;Bin Fang;Jingwei Wang
中科院分区：
文献类型：
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作者：
Tianmao Lai;Yuguo Chen;Bin Fang;Jingwei Wang
摘要原子力显微镜(AFM)的仪器参数对粘附力的影响有待澄清。在潮湿环境中测量了无顶悬臂梁与云母之间的粘附力，以考察仪器参数的影响。在一个位置重复测量的粘附力相对稳定，重复性很好。随着保温时间的延长(S 0~0.4时)，外力反常减小约10%，然后基本保持稳定(0.410 S)。其原因是液桥的动态形成过程。由于驱动压力较大，液桥的体积会急剧增大，达到最大值，大于饱和时的最大值。这会导致液体流动导致桥接的减少，最终导致减少。随着接近速度的增加，力的大小略有增加，然后保持稳定。但随着回缩速度的增加呈对数增加，随压电速度的增加而增加，在对数坐标下呈凹形向下增加。速度依赖性归因于粘性力的动态增强和接触时间的依赖性。研究结果有助于理解仪器参数的影响，加深对液桥形成机理的理解。
ABSTRACT The influence of instrumental parameters of an atomic force microscope (AFM) on adhesion forces demands clarification. Adhesion forces between a tipless cantilever and mica were measured in a humid environment to investigate the influence of instrumental parameters. The adhesion force measured repeatedly at a location is relatively stable with excellent reproducibility. The force abnormally decreases by ~10% with dwell time (0 ~ 0.4 s), then remains almost stable (0.4 ~ 10 s). The reason was the dynamic formation process of a liquid bridge. Due to a large driving pressure, the volume of the liquid bridge can increase intensely to the maximum one, which is larger than that in saturation. This leads to the reduction in the bridge by liquid flow, eventually resulting in the decrease. The force increases by a small magnitude with approach velocity and then remains stable. However, it increases logarithmically with retraction velocity and increases with piezo velocity with a concave downward shape in the logarithmic coordinate. The velocity dependence was ascribed to the dynamic enhancement of viscous force and the contact time dependence. The outcomes may help to understand the influence of instrumental parameters, and deepen the understanding of the formation mechanism of a liquid bridge.