Charged Surfaces: DLVO Model & Aggregation Kinetics

This lecture covers the interaction between charged surfaces, focusing on electrostatic repulsion and the DLVO model for colloidal stability. Topics include the formation of charged interfaces, surface charging examples, and the Poisson-Boltzmann equation. The discussion extends to the Gouy-Chapman theory, the Stern model, and the double layer structure. The lecture also delves into the Debye screening length, ionic concentration, and surface potential. Practical applications such as the zeta potential measurement and the impact of valence on surface concentration are explored, along with examples like water softening using ion exchangers. Theoretical concepts are complemented with experimental methods for determining surface potential.