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Related Experiment Video

Updated: Jan 11, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

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Adhesion force measurement on superhydrophobic and patterned surfaces using cantilever deflection.

Abhilash Sureshkumar1, Kiran Raj M1

  • 1Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology-Madras, Chennai, Tamilnadu 600036, India.

The Review of Scientific Instruments
|November 17, 2025
PubMed
Summary

Superhydrophobic (SHP) surfaces show stable, velocity-independent adhesion, while patterned SHP surfaces exhibit velocity-dependent behavior. This cantilever technique accurately measures forces on special surfaces for applications like self-cleaning materials.

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Last Updated: Jan 11, 2026

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Area of Science:

  • Surface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • Superhydrophobic (SHP) surfaces exhibit unique water-repellent properties.
  • Understanding wetting and adhesion forces is crucial for SHP surface applications.
  • Existing measurement techniques may have limitations in characterizing dynamic behaviors.

Purpose of the Study:

  • To investigate the wetting and adhesion force behavior of different superhydrophobic surfaces.
  • To evaluate the influence of retraction velocity on adhesion forces.
  • To validate a cantilever-based force measurement technique for SHP surfaces.

Main Methods:

  • Utilized a cantilever-based force measurement technique.
  • Examined fully SHP-coated and patterned SHP/hydrophilic surfaces.
  • Varied droplet retraction velocities during measurements.

Main Results:

  • Fully SHP surfaces demonstrated velocity-independent adhesion, indicating stable and robust coatings.
  • Patterned SHP surfaces showed velocity-dependent adhesion and unique depinning behavior at low speeds.
  • Experimental results closely matched contact angle calculations, validating the measurement accuracy.

Conclusions:

  • The cantilever-based technique is accurate for measuring adhesion forces on SHP surfaces.
  • SHP surface adhesion behavior is dependent on surface design and testing conditions.
  • This method aids in developing advanced materials for self-cleaning, anti-fogging, and microfluidic applications.