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Does the Roll-off Angle Depend on Work of Adhesion?

Kiran Khadka1, Gregory S Ferguson1,2

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The roll-off angle of hexadecane droplets on surfaces was studied. Results show no direct relationship between droplet roll-off angle and the work of adhesion, aligning with prior research.

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Area of Science:

  • Surface science
  • Tribology
  • Materials science

Background:

  • Understanding droplet behavior on surfaces is crucial for applications like self-cleaning coatings and microfluidics.
  • Interfacial free energy significantly influences droplet-surface interactions, affecting phenomena like contact angle and adhesion.
  • Previous studies suggested a link between surface properties and droplet mobility, but direct evidence for work of adhesion's role was limited.

Purpose of the Study:

  • To investigate the direct dependence of hexadecane droplet roll-off angle on the work of adhesion.
  • To systematically study droplet behavior on surfaces with controlled structural similarity and varying interfacial free energies.
  • To clarify the relationship between surface energy, adhesion, and droplet mobility.

Main Methods:

  • Fabrication of nearly ideal surfaces with similar structures but varied interfacial free energies.
  • Measurement of hexadecane droplet contact angles to quantify work of adhesion.
  • Measurement of droplet roll-off angles under controlled conditions.
  • Analysis of the correlation between roll-off angle and work of adhesion, while minimizing contact angle hysteresis.

Main Results:

  • Hexadecane droplet contact angles varied, indicating differences in work of adhesion across the tested surfaces.
  • Contact angle hysteresis was low and consistent across surfaces, allowing for reliable roll-off angle measurements.
  • No direct dependence of the hexadecane droplet roll-off angle on the work of adhesion was observed.
  • The findings are consistent with historical observations in the field of surface science.

Conclusions:

  • The work of adhesion does not appear to be a primary determinant of hexadecane droplet roll-off angle on these specific surfaces.
  • Surface structure and other factors likely play a more significant role in dictating droplet mobility than work of adhesion alone.
  • This study provides empirical evidence supporting earlier theoretical and experimental descriptions of droplet-surface interactions.