As a device with excellent potential, the quartz crystal microbalance (QCM) has been developed to study the interfacial properties of liquids, such as adsorption/desorption kinetics, electrochemical reaction mechanisms and interfacial viscosity. In this research, the adsorption properties of cationic polyelectrolytes (poly(diallyl dimethylammonium chloride) and poly(allylamine hydrochloride)) on solid surfaces were observed using QCM. The results indicated that the response to adsorption was different with a change in polyelectrolyte solution concentration and that the frequency shift increased as the solution concentration increased. The adsorption of the polyelectrolyte also depends on the solid surfaces and solution pH values. Furthermore, the change in the molecular conformation of the polyelectrolyte molecules is the main factor that affects the adsorption properties and structures.
