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Principles of Video Contact Angle Analysis, Medicine, Page 4

Principles of Video Contact Angle Analysis

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Observing Contact Angle

What one observes is actually a
2D projection of 3D drop
Observation plane

Slope at Tri-point
Intersection of observation
plane and the drop
•At least one is liquid phase

•Test surface is solid phase or
another liquid phase

•Third phase is vapor phase
(drop vapor and air) or
another liquid phase
Intersection ring of tri-phase
Tri-phase Point on
the observation plane


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