The capillary force between an AFM tip and a surface at different humidity

Chao Chen Sheng, Jen-Fin Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the present study, the meniscus profiles of water bridges formed at different relative humidity are determined using the geometric relationships including the Kelvin equation and the force equilibrium formula established for the meniscus. The pull-off forces predicted by the present model show good agreement with the experimental results reported in the literatures. When the contact angles at two solid bodies are equal, the pull-off force is slightly elevated by an increase of the relative humidity of air, and is significantly elevated by an increase of the asperity radius. Furthermore, two hydrophobic surfaces with equally large contact angles lower the pull-off force. If a difference exists between the contact angles of two solid surfaces, the asperity with a hydrophilic surface incorporating with a smooth flat plate with a hydrophobic surface reduces the pull-off force.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME - 2nd International Conference on Integration and Commercialization of Micro and Nanosystems, MicroNano 2008
Pages339-342
Number of pages4
DOIs
Publication statusPublished - 2008 Dec 1
Event2008 ASME 2nd International Conference on Integration and Commercialization of Micro and Nanosystems, MicroNano 2008 - Kowloon, Hong Kong
Duration: 2008 Jun 32008 Jun 5

Publication series

Name2008 Proceedings of the ASME - 2nd International Conference on Integration and Commercialization of Micro and Nanosystems, MicroNano 2008

Other

Other2008 ASME 2nd International Conference on Integration and Commercialization of Micro and Nanosystems, MicroNano 2008
CountryHong Kong
CityKowloon
Period08-06-0308-06-05

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Electrical and Electronic Engineering

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