Correlation between surface charge and hydration on mineral surfaces in aqueous solutions: A critical review

Surface charges and hydration are predominant properties of colloidal particles that govern colloidal stability in aqueous suspensions. These properties usually coexist and interact with each other. The correlation between the surface charge and hydration of minerals is summarized on the basis of innovative experimental, theoretical, and molecular dynamics simulation studies. The factors affecting the adsorption behavior of ions and water molecules, such as ion concentration, ion hydration radius and valence, and surface properties, are discussed. For example, the hydration and adsorption states completely differ between monovalent and divalent ions. For ions of the same valence, the effect of surface charge on the hydration force follows the Hofmeister adsorption series. Electrolyte concentration exerts a significant effect on the hydration force at high ion concentrations. Meanwhile, the ion correlations in high-concentration electrolyte systems become long range. The interfacial water structure largely depends on surface chemistry. The hydration layer between different surfaces shows large qualitative differences. © 2020, University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature.

mineral; surface charged ion; surface hydration; water molecule Adsorption; Electrolytes; Hydration; Ions; Molecular dynamics; Molecules; Sols; Surface charge; Surface chemistry; Adsorption behavior; Aqueous suspensions; Colloidal Stability; Concentration electrolyte; Electrolyte concentration; Interfacial water structure; Molecular dynamics simulations; Qualitative differences; Suspensions (fluids)

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