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Measure of high contact angles
Auriane Huyghues Despointes1, Alice Mougey1, David Quéré1
1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, ESPCI, Paris, France.
Soft Matter
|April 4, 2025
Summary
Determining high water contact angles (θ > 150°) is challenging. A new method measuring drop base size for known volumes precisely determines these angles, improving accuracy for liquid marbles and hot solids.
Area of Science:
- Surface Science
- Materials Science
- Physics
Background:
- Water repellency is crucial in many applications.
- High contact angles (θ > 150°) define superhydrophobicity.
- Existing methods for measuring high contact angles lack precision due to factors like gravity.
Purpose of the Study:
- To develop a precise method for determining high contact angles.
- To overcome limitations of traditional side-view drop analysis.
- To validate the new method on challenging surfaces like liquid marbles and hot solids.
Main Methods:
- Measuring the base diameter of a liquid drop with a known volume.
- Utilizing geometric calculations to derive the contact angle.
- Applying the method to water drops on various surfaces, including liquid marbles and hot solids.
Main Results:
- The new method determines high contact angles with a precision of approximately 1°.
- This is a significant improvement over traditional methods with ~10° uncertainty.
- Accurate contact angles were obtained for liquid marbles and water on hot solids.
Conclusions:
- Measuring drop base size offers a highly accurate technique for quantifying water repellency.
- This method provides a reliable tool for studying superhydrophobic surfaces.
- The findings advance the understanding and characterization of wetting phenomena.
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