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Contact Angle

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...

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Robust Contact Angle Determination for Needle-in-Drop Type Measurements.

Emőke Albert¹, Borbála Tegze¹, Zoltán Hajnal²

¹Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, Hungary.

|November 14, 2019

Summary

A new method robustly determines contact angles from sessile drops by fitting the difference between the drop profile and a circumcircle. This approach overcomes limitations of traditional polynomial fitting, offering high accuracy (≤0.6°).

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Area of Science:

Materials Science
Surface Science
Physical Chemistry

Background:

Contact angle measurement is crucial for understanding surface properties.
Polynomial fitting of sessile drop profiles is common but sensitive to parameters.
Missing apex in drop profiles complicates traditional fitting methods.

Purpose of the Study:

To introduce a robust and easily implementable method for accurate contact angle determination.
To overcome the sensitivity of polynomial fitting to order and pixel number.
To provide a reliable contact angle measurement technique for sessile drops with missing apexes.

Main Methods:

Applied polynomial fitting to the difference between the drop profile and a circumcircle.
Independently fitted both sides of the drop profile.
Used the derivative of the difference at the contact point to correct the slope.

Main Results:

Achieved robust contact angle determination with high accuracy (≤0.6°).
Results were independent of contact angle, drop volume, and image resolution.
Validated the method against Young-Laplace fit in the 20°-150° range.

Conclusions:

The novel circumcircle-difference fitting method offers a straightforward and accurate solution for contact angle measurement.
This technique effectively addresses the drawbacks of traditional polynomial fitting for sessile drops.
The method provides reliable contact angle data across various conditions and ranges.