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Contact-Angle Fitting Models: Preserve the Analysis Method
Contact-angle software can fit a drop contour using different mathematical models. Record the selected method so a software-setting change is not mistaken for a coating change.
Updated · NANOLAB Knowledge
The key distinction
KRUSS describes several fitting approaches with different applications. The laboratory should select a suitable method for the observed drop and measurement arrangement, rather than choosing whichever fit produces the preferred angle.
Practical checks
- Keep the original image and selected fit information.
- Review whether the contour and method are appropriate.
- Use a consistent justified approach for comparable specimens.
Example
Illustrative example: the same images are reanalysed with another model and yield different angles. The new values require a method explanation; they are not new physical observations of improved coating performance.
Scope and limits
Do not compare unexplained software outputs as if they were identical procedures. A qualified reviewer should interpret the fit quality and the limitations of the actual measurement.
Related guidance
- Contact Angle Hysteresis: Why a Tall Water Bead Can Still Stick
- The Two-Bucket Wash Method for Coated Cars
- Contact-Angle Baselines: Locate the Actual Surface in the Image
- Micrometres and Nanometres in Coating Reports: Check the Scale
Technical references: KRUSS: drop-shape analysis. These sources describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.
Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.
Continue reading
Contact Angle Hysteresis: Why a Tall Water Bead Can Still Stick
Understand advancing and receding contact angles, calculate hysteresis, and learn why a tall water bead may still resist movement.
The Two-Bucket Wash Method for Coated Cars
Understand how separate wash and rinse buckets reduce dirt transfer, and which other habits are still needed to protect the finish.
Contact-Angle Baselines: Locate the Actual Surface in the Image
The baseline used in drop-shape analysis represents the sample surface. An incorrectly placed baseline can change the reported angle even when the underlying droplet has not changed.