ADSORPTION OF NONIONIC AND CATIONIC SURFACTANTS FROM AQUEOUS BINARY-MIXTURES ONTO THE SOLID LIQUID INTERFACE/

The effect of the cationic surfactant cetyltrimethylammonium bromide ( CTAB) on the adsorption of the nonionic surfactant iso-nonilphenol eth oxylate with an average polyethylene oxide chain length of about 25 at the limestone/ solution interface was studied. The adsorption and eff ect of individual and mixed solutions of surfactants on the wetting be haviour of limestone surface was also studied. The results indicated t hat only CTAB was adsorbed onto the limestone surface from solutions o f mixture surfactants. The results also showed that hydrophobization o f the solid surface occurred at a very low concentration and then, as the concentration of surfactants increased it became hydrophilic.