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Related Concept Videos

Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...

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An improved meniscus surface model for contacting rough surfaces.

Xiaojie Xue1, Andreas A Polycarpou

  • 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Journal of Colloid and Interface Science
|March 24, 2007
PubMed
Summary

This study presents an improved meniscus model for adhesion, considering surface roughness and humidity. Smoother surfaces and lower humidity increase adhesion, crucial for microelectromechanical systems (MEMS) applications.

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Area of Science:

  • Adhesion science
  • Surface physics
  • Materials science

Background:

  • Adhesion is critical in microelectromechanical systems (MEMS) and hard disk drives.
  • Understanding meniscus behavior under varying humidity and surface conditions is essential for device reliability.

Purpose of the Study:

  • To develop an improved meniscus surface model incorporating asperity deformation and solid surface interactions.
  • To investigate the influence of surface roughness and relative humidity on adhesion forces in MEMS and hard disk drive surfaces.

Main Methods:

  • Developed a single asperity capillary meniscus model based on Extended-Maugis-Dugdale (EMD) elastic theory.
  • Coupled the single asperity model with a statistical roughness surface model for broad applicability.
  • Performed simulations on MEMS and hard disk drive surfaces, analyzing effects of roughness and humidity.

Main Results:

  • Smoother surfaces result in higher adhesive and pull-off forces.
  • Capillary forces dominate adhesion at high relative humidity.
  • Solid surface interactions become significant and must be included as humidity decreases.

Conclusions:

  • The developed model accurately predicts adhesion energy per unit area for MEMS surfaces.
  • The findings highlight the importance of considering surface roughness and humidity in adhesion modeling for microdevices.