When an interface exists between a liquid and a solid, the angle between the surface of the liquid and the outline of the contact surface is described as the contact angle θ (lower case theta). The contact angle (wetting angle) is a measure of the wettability of a solid by a liquid.
In the case of complete wetting (spreading), the contact angle is 0°. Between 0° and 90°, the solid is wettable and above 90° it is not wettable. In the case of ultrahydrophobic materials with the so-called lotus effect, the contact angle approaches the theoretical limit of 180°.
Contact angle measurements of suitable liquids can be used to characterize material properties like the surface energy.
- Comparative Measurement of contact angle / surface energy to reveal surface contaminations
- Measurement of Silicon wafer
- Measurement of photodiode
Krüss - EasyDrop FM40Mk2
- Measuring range: 1-180°
- Accuracy: +- 0.1°
- Max. sample dimensions: 300 mm × ∞ × 50mm (W × D × H)
- Computer controlled dosing
- Regulable illumination
- Objective: 6x zoom