The measurement of contact angle is typically carried out using a contact angle goniometer. The instrument involves placing a droplet of liquid on the surface of the material and capturing the image using a camera. The contact angle is then calculated by analyzing the shape of the droplet using software. There are different methods for measurement, including the sessile drop method, the captive bubble method, and the pendant drop method. The sessile drop method is the most common for nanotechnology applications.
