The pH-dependent surface charging and the points of zero charge.

By Marek Kosmulski. Journal of Colloid and Interface Science, 2002

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Fate and Bioavailability of Engineered Nanoparticles in Soils: A Review (2014, background): “ENM have often a negative surface charge, because commercial 2728 G. Cornelis et al. Values from Illes and Tombacz (2006), Kosmulski (2009), Stumm and Morgan (1996), Tombacz and Szekeres (2004), and Tombacz and Szekeres (2006). coatings or the adsorption of negatively charged dissolved organic…”
Isoelectric point and adsorption activity of porous g-C3N4 (2015, background): “[2] M.”
Protein adsorption and cellular uptake of cerium oxide nanoparticles as a function of zeta potential. (2007, background): “In metal oxides, zeta potential can be altered by changing the pH, conductivity, or concentration of a formulation component [8].”
Kinetic stability of hematite nanoparticles: the effect of particle sizes (2008, methodology): “The reported hematite PZC values in the literature range from 7.2 to 9.5, and depend on the method of synthesis and experimental procedure used for determining PZC ( Kosmulski 2002; Kosmulski 2006).”
Metal oxides based electrochemical pH sensors: Current progress and future perspectives (2020, background): “A change in the pH value of a solution affects the equilibrium state of MOx surface, which may lead to changes in electrical properties and surface potential (Ψ) of the SE [61,92,109,151,152].”