Electrokinetic properties and stability of cerium dioxide suspensions

Abstract

The aggregation regularities of large CeO2 particles as a function of aging, pH, ultrasonic treatment and concentration of added electrolytes have been studied using laser diffraction and microphoresis.

Influence of pH and electrolyte on the deposition of cerium oxide nanoparticles on supported lipid bilayers

“…2a), likely due to the excessive adsorption of Ca 2+ . The charge reversal of CeO 2 particles from negative to positive had also been observed by Barany et al 29 in AlCl 3 and LaCl 3 solutions and was ascribed to the adsorption of cations in the Stern layer of the particles. Through interpolation between 1 and 10 mM CaCl 2 , the CaCl 2 concentration at which n-CeO 2 became neutral (or isoelectric electrolyte concentration, IEC) is determined to be 2.7 mM at pH 8.0.…”

Synthesis and characterization of CeO2/Bi2O3/gC3N4 ternary Z‐scheme nanocomposite

“…A similar observation for CeO 2 catalyst was already reported 37 . Meanwhile, as pH increases, there is an increase in negative charge on the surface due to increased dissociation of the surface OH groups 38 . Even though the surface has a high negative charge under high pH conditions, the degradation of MG could not be studied using a spectrophotometer.…”

Highly Dispersed CeOx Hybrid Nanoparticles for Perfluorinated Sulfonic Acid Ionomer–Poly(tetrafluoethylene) Reinforced Membranes with Improved Service Life

“…The formation of stable hybrid nanoparticles in the acidic atmosphere is highly related to the CeO x dispersion characteristics depending on the pH value of the dispersion media. Note that CeO x nanoparticles are stably dispersed in a pH level lower than their isoelectric point (IEP; IEP of CeO x = pH 7–8 [ 44 , 45 ]) because the electrostatic repulsion between the nanoparticles with positive surface charges prevent them from being aggregated [ 46 , 47 ]. Furthermore, the strengthened electrostatic attraction between the Ce 3+ ions in insoluble Ce(OH) 3 and the –SO 3 − groups of 3M 725EW ionomer may help in retaining a stable dispersed phase.…”