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Doping Effect on the Interaction and Stability of Semiconductor Nanoparticles Suspended in Electrolyte Solution

The interactions between nanoparticles and colloids in suspensions are extremely important because they determine the system stability and suggest strategies for manipulation, processing, and controlled assembly. For example the formation of multiparticle clusters, two-dimensional particles arrays, or any other directed assembly will depend on the physical interaction between the particles, or with between the particles and a macroscopic surface. The most common interactions in aqueous systems are described by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, which considers the balance between the electrostatic repulsive and the van der Waals attractive forces. While being far from complete, the DLVO theory has been very successful in the analysis of the stability of dielectric colloidal particles dominated by electrostatic interactions.