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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Scanning Drop Friction Force Microscopy.

Chirag Hinduja1, Alexandre Laroche1,2, Sajjad Shumaly1

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|November 18, 2022
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Summary
This summary is machine-generated.

Scanning drop friction force microscopy (sDoFFI) maps surface wetting variations with high resolution. This new technique visualizes wetting properties on diverse surfaces, overcoming limitations of existing methods for detailed analysis.

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Area of Science:

  • Surface science
  • Tribology
  • Fluid dynamics

Background:

  • Wetting imperfections on surfaces cause contact angle hysteresis and influence wetting dynamics.
  • Traditional methods like contact angle goniometry lack the resolution to pinpoint localized wetting variations.

Purpose of the Study:

  • To introduce and validate scanning drop friction force microscopy (sDoFFI) as a novel technique for high-resolution 2D wetting characterization.
  • To demonstrate sDoFFI's capability in mapping wetting properties on various natural, technical, and model surfaces.

Main Methods:

  • Raster-scanning a 15 μL water drop across surfaces using sDoFFI.
  • Measuring the friction force (lateral adhesion) along the moving contact line.
  • Generating 2D wetting maps by plotting friction force against drop position.

Main Results:

  • sDoFFI successfully generated 2D wetting maps of surfaces up to several square centimeters.
  • The technique detected features smaller than 0.5 mm on natural (rose petal), superhydrophobic (Glaco paint), and model inhomogeneous surfaces.
  • Quantified stick-slip motion of drops crossing boundaries between areas of differing contact angles, revealing distinct patterns based on hysteresis direction.

Conclusions:

  • sDoFFI is a powerful new tool for 2D characterization of surface wetting properties.
  • The technique is applicable to a wide range of samples, including laboratory, biological, and commercial surfaces.
  • sDoFFI provides detailed insights into wetting dynamics and surface inhomogeneities previously inaccessible.