纺织材料表面的接触角的测量

This sample is an open weave material with a reasonably hydrophyllic fiber. A consequence of
this is that the material can not support a sessile drop. However, its apparent absorption is due
far more to its open weave than to capillary forces. Basically water "falls through" the surface
more than it absorbs into it. This was verified by conducting a capillary rise test where the
sample is dipped into a beaker of water and the rise of the wetted portion noted. This sample
exhibited very little rise, perhaps a mm. By comparison, an ordinary paper towel (a much denser
material) will have a 10 or 15mm rise within a second or two. With this behavior in mind, the
following images illustrate its behavior.