Abstract
Dispersion stability of the <TEX>$Sm_xCe_{1-x}O_{2-2/x}$</TEX> nanoparticles, which was produced by hydrothermal process, was studied in aqueous suspension using ESA (Eletrokinetic Sonic Amplitude). The average particle size of the synthesized <TEX>$Sm_xCe_{1-x}O_{2-2/x}$</TEX> at nanoparticles was about <TEX>$5{\pm}2nm$</TEX>. The dispersion and rheological behavior of the <TEX>$Sm_xCe_{1-x}O_{2-2/x}$</TEX> nanoparticles aqueous suspension was investigated using <TEX>$NH_4OH\;and\;HNO_3$</TEX> as a disperse agent. The colloidal stability of aqueous suspensions with <TEX>$Sm_xCe_{1-x}O_{2-2/x}$</TEX> nanoparticles at different pH values has been investigated by means of zeta potential, average particle size, and the distribution of synthesized <TEX>$Sm_xCe_{1-x}O_{2-2/x}$</TEX> nanoparticles. The isoelectric point of the <TEX>$Sm_xCe_{1-x}O_{2-2/x}$</TEX> nanoparticles was at pH around 11 and the value of zeta potential was at its maximum near pH 6.5.
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