Capillary Force Analysis of Constant-Volume Liquid Bridges in Atomic Force Microscopes

WEI Zheng; CHEN Shao-yong; ZHAO Shuang; SUN Yan

doi:10.3879/j.issn.1000-0887.2014.04.003

Volume 35 Issue 4

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WEI Zheng, CHEN Shao-yong, ZHAO Shuang, SUN Yan. Capillary Force Analysis of Constant-Volume Liquid Bridges in Atomic Force Microscopes[J]. Applied Mathematics and Mechanics, 2014, 35(4): 364-376. doi: 10.3879/j.issn.1000-0887.2014.04.003

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Capillary Force Analysis of Constant-Volume Liquid Bridges in Atomic Force Microscopes

doi: 10.3879/j.issn.1000-0887.2014.04.003

College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R.China

Funds: The National Natural Science Foundation of China（11072024）

Received Date: 2013-12-20
Rev Recd Date: 2014-03-10
Publish Date: 2014-04-15

Abstract

Abstract

The capillary force and rupture energy of the constant-volume liquid bridge in the atomic 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. Rupture 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.
- liquid bridge,
- capillary force,
- thermodynamic method,
- atomic force microscope,
- energy dissipation,
- circular-arc approximation,
- contact angle hysteresis

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References(26)

References

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