Sessile drop technique
（重定向自Sessile drop method）
![](/Images/godic/202502/10/Contact_angle.svg5237.png")
![water droplet immersed in oil and resting on a brass surface](/Images/godic/202502/10/Water_droplet_in_oil_on_brass_surface5237.JPG")
![same fluids as above, but resting on a glass surface](/Images/godic/202502/10/Water_droplet_in_oil_on_glass_surface5237.JPG")
![Fig 3: Sketch of the contact angle, as seen by a goniometer. In the top picture, the volume of the drop is being increased, and in the bottom it is being decreased. Each angle is measure of the same contact angle](/Images/godic/202502/10/Contactangle5237.GIF")
The Sessile Drop Technique is a method used for the characterization of solid surface energies, and in some cases, aspects of liquid surface energies. The main premise of the method is that by placing a droplet of liquid with a known surface energy, the shape of the drop, specifically the contact angle, and the known surface energy of the liquid are the parameters which can be used to calculate the surface energy of the solid sample. The liquid used for such experiments is referred to as the probe liquid, and the use of several different probe liquids is required.