A modified method for computation of contact angles of aqueous electrolytesolutions on quartz

A modified technique is proposed for computing contact angles of aqueous el ectrolyte solutions on charged solid surfaces with varying degrees of hydro philicity. Along with earlier equations for molecular and structural forces , the modified method also uses a more general expression for electrostatic forces, which is not confined to the condition of a low solution concentra tion. The resultant expression allows us to compute contact angles for aque ous solutions in a wide range of concentrations and pH values. The applicab ility range is determined for the previously obtained simplified expression describing electrostatic forces in films. An approach to computer search f or parameters of structural forces of hydrophilic repulsion and hydrophobic attraction in wetting films on the basis of experimental values is develop ed.