Nano-Wilhelmy investigation of dynamic wetting properties of AFM tips through tip-nanobubble interaction.
Nano-Wilhelmy investigation of dynamic wetting properties of AFM tips through tip-nanobubble interaction.
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Nano-Wilhelmy 通过尖端与纳米气泡相互作用研究 AFM 尖端的动态润湿特性
DOI：
10.1038/srep30021
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发表时间：
2016-07-25
影响因子：
4.6
通讯作者：
Guo B
中科院分区：
文献类型：
--
作者：
Wang Y;Wang H;Bi S;Guo B
原子力显微镜（AFM）针尖的动态润湿性能在许多与原子力显微镜相关的测量、制造和操作应用中备受关注。在这项研究中，硅和氮化硅原子力显微镜针尖的润湿性能进行了研究，通过动态接触角测量使用纳米威廉平衡为基础的方法。这是通过在AFM针尖相对于界面纳米气泡的延伸和缩回运动期间的毛细管力测量来完成的。介绍了该方法的工作原理和动态接触角测量的数学模型。利用扫描电子显微镜（SEM）从不同视角拍摄的图像，构建了AFM针尖的几何模型。利用原子力显微镜对纳米气泡的力-距离曲线研究了针尖-纳米气泡相互作用的详细过程。提取了纳米气泡高度、针尖与纳米气泡之间的粘附力和毛细作用力等参数。这些参数的变化进行了研究，在纳米气泡表面。AFM针尖的动态接触角由毛细管力测量计算。所提出的方法提供了直接测量的动态接触角的AFM针尖，也可以作为一种通用的方法，纳米动态润湿性能的调查。
The dynamic wetting properties of atomic force microscopy (AFM) tips are of much concern in many AFM-related measurement, fabrication, and manipulation applications. In this study, the wetting properties of silicon and silicon nitride AFM tips are investigated through dynamic contact angle measurement using a nano-Wilhelmy balance based method. This is done by capillary force measurement during extension and retraction motion of AFM tips relative to interfacial nanobubbles. The working principle of the proposed method and mathematic models for dynamic contact angle measurement are presented. Geometric models of AFM tips were constructed using scanning electronic microscopy (SEM) images taken from different view directions. The detailed process of tip-nanobubble interaction was investigated using force-distance curves of AFM on nanobubbles. Several parameters including nanobubble height, adhesion and capillary force between tip and nanobubbles are extracted. The variation of these parameters was studied over nanobubble surfaces. The dynamic contact angles of the AFM tips were calculated from the capillary force measurements. The proposed method provides direct measurement of dynamic contact angles for AFM tips and can also be taken as a general approach for nanoscale dynamic wetting property investigation.