ABSTRACT
The shape of the meniscus of water at the plate may either be depressed away or advanced toward the dry surface. In general, a hydrophobic surface would result in a depressed meniscus (yD,a,1> 90 degrees, cos yD,a,1< 0) whereas a hydrophilic surface would result in an advanced meniscus (yD,a,1< 90 degrees, cos yD,a,1> 0). The meniscus can be clearly seen visually for extremely hydrophilic and hydrophobic surfaces. Surfaces with moderate hydrophilicity/hydrophobicity exhibit flat meniscus, which seems to be perpendicular to the surface (yD,a,1¼ 90 degrees, cos yD,a,1¼ 0).
