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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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Potential for tunable static and dynamic contact angle anisotropy on gradient microscale patterned topographies.

Christopher J Long1, James F Schumacher, Anthony B Brennan

  • 1Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 17, 2009
PubMed
Summary
This summary is machine-generated.

Topography directionality significantly impacts contact angle measurements. Even with discontinuous features, anisotropy exists, necessitating orientation consideration in microfluidic and surface designs.

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Area of Science:

  • Materials Science
  • Surface Science
  • Fluid Dynamics

Background:

  • Contact angle measurements are crucial for understanding surface wettability.
  • Anisotropy in contact angles has been observed on continuous topographies like ridges and channels.
  • The effect of discontinuous microfeatures on contact angle anisotropy was not well understood.

Purpose of the Study:

  • To evaluate the validity of ignoring topography directionality in contact angle characterization.
  • To investigate static and dynamic contact angle anisotropy on microscale patterned topographies with varying feature continuity.
  • To assess the influence of feature discontinuities on contact angle anisotropy compared to continuous ridges.

Main Methods:

  • Fabrication of seven poly(dimethyl siloxane) elastomer (PDMSe) topographies with elongated discontinuous microfeatures and one with ridges.
  • Measurement of static contact angle, advancing contact angle, receding contact angle, contact angle hysteresis, and slip angle using water.
  • In-plane contact angle measurements were performed at three perspectives relative to feature orientation.

Main Results:

  • Discontinuous feature topographies showed statistically significant anisotropy (2-6 degrees) in static and dynamic contact angles.
  • Continuous ridges exhibited much larger anisotropy (5-42 degrees) in contact angles.
  • Discontinuities significantly reduced, but did not eliminate, contact angle anisotropy compared to continuous features.

Conclusions:

  • Contact angle anisotropy is present even in topographies with discontinuous microfeatures.
  • The orientation of topography relative to contact angle measurements must be identified.
  • Directionality should be considered in the design of microfluidic devices and self-cleaning surfaces.