Study of Growth Mechanisms for the Liquid Bridge in Atomic Force Microscopes

WEI Zheng; ZHAO Shuang; CHEN Shao-yong; DING Wen-xuan

doi:10.3879/j.issn.1000-0887.2015.01.008

Volume 36 Issue 1

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WEI Zheng, ZHAO Shuang, CHEN Shao-yong, DING Wen-xuan. Study of Growth Mechanisms for the Liquid Bridge in Atomic Force Microscopes[J]. Applied Mathematics and Mechanics, 2015, 36(1): 87-98. doi: 10.3879/j.issn.1000-0887.2015.01.008

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Study of Growth Mechanisms for the Liquid Bridge in Atomic Force Microscopes

doi: 10.3879/j.issn.1000-0887.2015.01.008

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: 2014-10-13
Publish Date: 2015-01-15

Abstract

Abstract

The liquid bridge is the main reason for image distortion of an atomic force microscope (AFM) in the atmospheric ambiance, meanwhile the capillary force resulting from the liquid bridge dominates the adhesion force in this condition. Investigation of the liquid bridge is of great importance to understand the imaging mechanisms and the sample properties. Herein, 3 different growth processes were presented and analyzed for the growth mechanisms of the liquid bridge in AFMs, including the squeezing process, the capillary condensation and the motion of thin liquid film. The characteristic equilibrium times of the 3 processes are of great importance to the understanding of the liquid bridge’s growth dynamics. The equilibrium time of the squeezing process depends on the contact mode, that of the capillary condensation is at the μs order of magnitude and that of the liquid film motion varies drastically with different viscosities of the liquid film. The contribution of the corresponding 3 growth mechanisms to liquid bridge volume, capillary force and energy dissipation was comaratively studied in different AFM operation modes.
- atomic force microscope,
- liquid bridge,
- squeezing process,
- capillary condensation,
- motion of liquid film

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References(42)

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