Abstract
The zeta potential of Tl2Ba1.6Sr0.4Ca2Cu3O10+y (Tl-2223) superconducting oxide particles in a cyclohexanone bath with added I2 was studied with respect to the ionic strength, the amount of adsorption of H+ on the particles and the electronegativity of the metal ions in the particles. The surface charge density of particles and the ionic strength of the bath were calculated from the amount of H+ generated due to the addition of I2 to the bath and the conductivity change resulting from the addition of the Tl-2223 powder. The zeta potential derived from the surface charge density and the ionic strength is in good agreement with that measured by the electrophoresis method. The ionic strength obtained from the maximum amount of deposit is in good agreement with the that obtained from the maximum zeta potential. It is shown that the amount of adsorption of H+ on the particles is influenced by the electronegativity of the metal ions in the particles.
