2.2.3. Determination of wettability
Twenty samples were cut from each panel group to evaluate
wettability tests. Contact angle (CA) was used to obtain the wettability
characteristics of the panels. The CA values were determined
using with a KSV Cam-101 Scientific Instrument (Helsinki, Finland).
Distilled water was used as the liquid. The image of the liquid drop
was captured by a video camera and the CA was measured by digital
image analysis software. After the 5L droplet of distilled water
was placed on the sample surface, contact angles from the images
were measured at 1-s time intervals up to 10 s total and an average
CA was calculated.