title: Barium hexaferrite suspensions for electrophoretic deposition.
abstract: In this investigation we have looked at the preparation of barium hexaferrite suspensions, with the stability of the magnetic barium hexaferrite particles being increased by the addition of a surfactant, dodecylbenzylsulfonic acid (DBSA). The influence of the solubility DBSA in different solvents and its adsorption onto the surfaces of particles with different sizes were determined from zeta-potential measurements. The most suitable and stable suspensions of barium hexaferrite particles, regardless of their sizes, were obtained in 1-butanol, and these were then used for a subsequent electrophoretic deposition. The microstructures of the deposits were examined with electron microscopy. The thickness and density of the deposits as a function of the electric field, the zeta-potential, the particle size, and the separation distance between the electrodes were investigated. The thickness of the deposits was found to increase with the increasing zeta-potential of the suspension and with the increasing separation distance between the electrodes. Denser deposits were obtained from the suspensions of smaller particles that had narrower particle size distributions.
authors.affiliation: Department for Synthesis of Materials, Jozef Stefan Institute, 1000 Ljubljana, Slovenia. simona.ovtar@ijs.si
authors.forename: Simona
authors.initials: S
authors.lastname: Ovtar
authors.forename: Darja
authors.initials: D
authors.lastname: Lisjak
authors.forename: Miha
authors.initials: M
authors.lastname: Drofenik