Contact Angle Goniometry
The angle at which a liquid interface meets a solid surface is called the contact angle. When a liquid has a low contact angle, the liquid is attracted to and will spread out onto the solid surface. Consequently, when a liquid has a high contact angle, the liquid is repelled from and will create a bead of liquid on the surface. Contact angle goniometry is used to measure this angle.
Ramé-Hart Contact Angle Goniometer with an optical system and micro-syringe attachment
- Static and dynamic drops
- Advancing and receding contact angles
- Surface tension
- Surface free energies
- Optical system to capture the profile of the liquid on the solid surface
Selected Applications in Industry:
- Can give important information about the surface of a solid.
- Can give physical properties of interaction between the solid and liquid like wettability, affinity, adhesiveness and repellency.
- Advancing and receding contact angles can characterize heterogeneity, roughness and mobility.
- Can be used to evaluate the cleanliness of a solid surface.