Contact Angle

Contact Angle Goniometry

Technique:
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.

Instrument:
Ramé-Hart Model 100 Contact Angle Goniometer with micro-syringe attachment (manual system).

Measurement Capabilities:

  • Static and dynamic drops
  • Advancing and receding contact angles

Selected Applications in Industry:

  • Can give important information regarding the wettability of a surface
  • Can be used to evaluate the cleanliness of a surface
  • Can be used to evaluate surface modifications