摘要
用表界面热力学方法和力学方法研究了原子力显微镜中等容液桥的毛细力和液桥的断裂能,对这两种方法进行了对比分析.对液桥分析中圆弧近似的适用性进行了讨论,对轻敲模式下的能量耗散进行了分析,指出液桥断裂引起的能量耗散是引起相位变化的主要因素,另外还指出了接触角滞后效应对毛细力和断裂能的影响.模型分析对原子力显微镜轻敲模式下成像机理的理解以及力曲线测量分析有一定的参考价值.
The capillary force and rupture energy of the constant-volume liquid bridge in the a- tomic force microscope （AFM） were investigated with the surface and interface thermodynamic and mechanical methods respectively. Comparison between results of these two methods was given. Validity of the circular-arc shape approximation of the liquid bridge was discussed, Rup- ture energy of the liquid bridge dominates the energy dissipation in the tapping mode of the AFM and makes a key factor effecting phase shift. Moreover, the contact angle hysteresis effect on the capillary force and rupture energy was presented. The work may have some reference for understanding of the imaging mechanism of the tapping mode of AFMs and analysis of the force- distance curves in AFMs.
出处
《应用数学和力学》
CSCD
北大核心
2014年第4期364-376,共13页
Applied Mathematics and Mechanics
基金
国家自然科学基金(11072024)
国家留学基金(201208110350)~~
关键词
液桥
毛细力
热力学方法
原子力显微镜
能量耗散
圆弧近似
接触角滞后
liquid bridge
capillary force
thermodynamic method
atomic force microscope
energy dissipation
circular-arc approximation
contact angle hysteresis
