Influence of Volume Drop on Surface Free Energy of Glass

Abstract

The aim of the research was to determine how the drop size the contact angle values and determine its optimal size for contact angle measurements and comparison of the contact values measured for three probe liquids (water, formamide,) on the glass surface using the: sessile drop and plate methods. Next, using the measured contact angles, the surface free energy and its components were determined from van Oss et al. (Lifshitz-van der Waals acid- base component,), Owens-Wendt, Neumann and contact angle hysteresis(CAH) approaches. The studies showed, that drop size is very for contact angle measurements and consequently, for free energy estimation.