Wetting of specimens of aluminum, zirconium, silicon and titanium oxides by human blood plasma and physiological solution

N. V.Boshytska

Adhesion of Melts and Brazing of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #43


The wetting processes of ZrO2, SiO2, Al2O3 and TiO2 oxide inorganic (distilled water)samples by biological (human blood plasma and physiological solution) and media were investigated. The wetting angles θ° were measured with an angle meter by projecting a drop onto a screen, calculating the angle between a tangent to the image of the drop and a projection of an edge line that passes through a three-phase junction point. The work of adhesion was calculated by the Dupret equation Wa = σlg (1 + cos θ). It is shown that the Al2O3, ZrO2 and TiO2 samples are intensively wetted by physiological solution containing 0,9% NaCl, which can be explained by the formation of readily soluble salts Al2Cl3, ZrCl4 and TiCl4 salts during their interaction with sodium chloride. Silicon chloride SiCl4 is a chemically stable compound, and its formation blocks pores of the sample and prevents its wetting. During interaction of the oxide samples with blood plasma, protein molecules bound to water molecules form large colloidal micelles with strong intermolecular bonds, which prevents wetting of samples.