Adsorption Modification of Dispersed Aluminum: The Effect of Surfactant and Polymer Adsorption on the Colloidal and Mechanical Properties of Aluminum Organosuspensions

Adsorption of surfactants (stearic acid, octadecylamine) and polymers (butadiene and nitrile synthetic rubbers with carboxyl end groups) on bare and modified surfaces of aluminum dispersed in polar and nonpolar solvents (isopropyl nitrate, octane) was studied. Adsorption data are compared with the results of the study of aggregative and sedimentation stabilities of aluminum dispersions, as well as with the mechanical characteristics of sediments. Notions of fractal nature of particle aggregates are used to describe data on organosuspension sedimentation. Experimental results are analyzed in terms of donor–acceptor properties of organosuspension components and interactions at the particle–solvent and particle–modifier interfaces.