Contact Angle Measurement

Contact angle instruments can optically analyse the shape of a drop of liquid in contact with a surface. This is achieved with a fast image capturing camera and analysis software.

The drop shape and contact angle depend on the both the topography and the surface energy of the solid surface. When attracted to the solid (material with higher surface energy), the liquid forms a drop with low contact angle (theta < 90o). If repelled (material with low surface energy), the contact angle is high (theta > 90o). The contact angle is a quantitative measure of how well the surface is wetted by the liquid.

Static MEASUREMENT MODE

Static Contact Angle is primarily used to determine the wetting characteristics of a substrate to check surface treatment, cleanliness and/or contamination effects. The purpose of this test is to determine the highest possible contact angle at “equilibrium”.

 


Dynamic  Measurement Mode

In this test mode a sequence of images is automatically captured as soon as the falling droplet arrives on the specimen surface. Each recorded image is analysed and the result is presented as a curve showing the dynamic change in contact angle (wetting), volume (absorption) and spreading as a function of time. This test is particularly useful for troubleshooting problems related to dynamic processes such as printing, gluing and coating applications.

 


PGx Portable  Instrument

The PGx is a fully automated Contact Angle Measurement Instrument that measures surface wetting and absorption in-situ on virtually any size or shape of surface. With a footprint of only 90mm x 55mm  and weighing just 400g, it is the smallest contact angle measurement device available, with features previously found only in larger laboratory instruments. The PGx enables direct surface testing of almost any 3D object without having to cut the sample to fit.

 


PGx Contact Angle Measurement Instrument:

  • 0.2uL to 10uL droplet size
  • 80 frames per second image capture
  • Touch down, impact and manual drop application modes
  • Built in, automatic calibration
  • Automatic sampling in both Static and Dynamic modes
  • adhesion (gluing, bonding)
  • absorption
  • surface contamination (cleaning)
  • wettability (printing, painting, coating)

 

Go to next section