Electrophoretic mobility of carboxyl latex particles in the mixed solution of 1:1 and 2:1 electrolytes or 1:1 and 3:1 electrolytes: Experiments and modeling

• We measured and calculated electrophoretic mobility of carboxyl latex particles in mixed solution of KCl and CaCl2 or KCl and LaCl3.
• Used theoretical models consider the deprotonation, the binding of Ca2+/La3+, diffuse double layer model, and the double layer relaxation. Experimental data are reasonably described by the theoretical models except the case with La3+ at high pH.
• The surface charge reduces due to the binding of Ca2+/La3+ to deprotonated carboxyl groups.
• The model with the binding of La3+ is unable to describe charge reversals in EPM at high pH.

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