Electrokinetics of Muscovite Mica in the Presence of Adsorbed Cationic Surfactants

Abstract

The electrokinetic properties of muscovite mica in the presence of four hexadecylammonium (CTA) salts and two dihexadecyldimethylammonium (DHDA) salts have been studied using a flat plate streaming potential technique. The potential results obtained for dihexadecyldimethylammonium acetate (DHDAA) and bromide (DHDAB) systems are compared with literature values obtained from the direct force balance technique. Good correlation between the two techniques is observed for the DHDAB system. For the DHDAA system, an analysis of the streaming potential results using a triple-layer model for the substrate-aqueous solution interface yields a degree of dissociation of the DHDA molecule of ≈20%. This is..