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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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Pattern Generation for Micropattern Traction Microscopy
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Published on: February 17, 2022

Eccentricity effect of micropatterned surface on contact angle.

Navid Kashaninejad1, Weng Kong Chan, Nam-Trung Nguyen

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 23, 2012
PubMed
Summary

The wetting property of micropatterned surfaces depends on pillar arrangement. Maximum hydrophobicity is achieved with zero pillar eccentricity, influencing surface design for controlled wetting.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Micropatterned surfaces are engineered to control wetting properties.
  • Surface topography significantly influences wettability and contact angle hysteresis (CAH).

Purpose of the Study:

  • To investigate the effect of pillar eccentricity on the wetting properties of micropatterned silicon surfaces.
  • To quantify the relationship between pillar arrangement and contact angle hysteresis.

Main Methods:

  • Fabrication of square micropatterns on silicon wafers with varying pillar eccentricities (0-6 μm).
  • Measurement of static and dynamic contact angles.
  • Quantification of contact angle hysteresis (CAH).

Main Results:

  • Contact angle decreases with increasing pillar eccentricity and relative spacing.
  • Maximum hydrophobicity is observed at zero eccentricity.
  • CAH can increase up to 41% with increasing eccentricity, especially at lower pillar spacing.

Conclusions:

  • Pillar eccentricity is a critical parameter influencing surface wettability.
  • Contact line deformation due to pillar orientation drives changes in wettability.
  • Findings offer insights for designing micropatterned surfaces with tailored wetting characteristics.