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Forces between negatively charged silica particles in aqueous electrolyte solutions were measured with the colloidal probe technique based on the atomic force microscope (AFM). The present study focuses on the comparison of monovalent and multivalent counterions, namely K+, Mg2+, and La3+. The force profiles can be well described with the theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO) down...