YBa2Cu3O7−x dispersion in iodine acetone for electrophoretic deposition: Surface charging mechanism in a halogenated organic media

Abstract

Electrophoretic Deposition (EPD) performance strongly depends on the particles surface chemistry and the ability to manipulate surface-liquid interfaces. In this study an extensive investigation of YBCO suspension in dry acetone, acetone-water mixtures and acetone-iodine is reported. Chemical instability of YBCO particles determines their colloidal behaviour. Charging mechanism of particles has therefore had to be deeply investigated for complete dispersion understanding. In order to determine the conditions of the YBCO suspension stability, measurements of pH, conductivity, zeta-potential, settling tests, modelling of the particle networks and electrophoretic deposition were done. The influence of the water and iodine concentration, and their role as stabilizers was evaluated. Based on experimental results, pair particle potentials were calculated and then different charging mechanisms of YBCO surfaces in acetone were proposed.

Improvement of TiN nanoparticles EPD inducing steric stabilization in non-aqueous suspensions

“…1b shows the evolution of the zeta potential of TiN suspensions with the amount of PEI (wt.%). TiN particles dispersed in isopropanol showed a negative zeta potential of −10 mV evidencing the acidic character of the powder related to the solvent [34]. The manipulation, as well as the preparation of the suspensions, was done at room conditions, and consequently a thin layer of titanium oxide should cover the TiN nanoparticles.…”

Enhancing power output and profitability through energy-efficiency techniques and advanced materials in today’s industrial gas turbines

“…The suspension can be stabilized by electrical charge on the surface of the particles due to the acid or alkaline nature of the suspension or by charges due to adsorption of a surfactant. Steric hindrance can be used as well, but the particles do need a surface charge for the process to work (Dusoulier et al 2011).…”

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Electrophoretic Deposition of 10B Nano/Micro Particles in Deep Silicon Trenches for the Fabrication of Solid State Thermal Neutron Detectors

“…For example, the zeta potential of the particle in certain medium can be changed by adding iodine. Iodine produces H + ion in some organic solvents and changes the pH value of the liquid [14].…”