Correlation between yttria stabilized zirconia particle size and morphological properties of NiO–YSZ films prepared by spray coating process

Ceramic Materials for Solid Oxide Fuel Cells

“…The flocculates present in slurries trap water inside their structure, thereby making it unavailable for flow and thus increasing the slurry viscosity. Upon shearing, the flocculates break and the water become available for flow, thereby decreasing the slurry´s viscosity (Fonseca et al, 2009;Nascimento et al, 2009;Ramanathan et al, 2005). It is important to determine how zeta potential and rheology measurements are correlated with the stability of slurries.…”

“…Parameters such as the slurry composition and preparation and the grain size of the powders affect the particle surface charge and on the Zeta potential (Fonseca et al, 2009;Maiti & Rajende,2002). The stabilisation mechanisms of the suspension are caused by both, steric hindrance and steric stabilisation.…”

“…Their results showed that the MFO was more effective than PE and the best dispersion was obtained with finer particle. Fonseca et al, 2009 fabricated NiO/YSZ anode functional layer with 40 wt.% of NiO. The slurries were prepared by two concentrations of polymethylmethacrylate (PMMA): 1 and 2 wt.%.…”

“…The zero value of the zeta potential, the isoelectric point, indicates the pH at which the particles tend to form flocculates. It is important that the suspensions are prepared in pH giving the maximum zeta potential (in module) (Fonseca et al, 2009;Maiti & Rajende, 2002;Ramanathan et al, 2005).…”

Desenvolvimento de catalisadores de Rh/Ni/YSZ e Ru/Ni/YSZ para a reforma interna de etanol em ânodos de células a combustível de óxido sólido

“…Os métodos de deposição mais utilizados atualmente são: moldagem em fitas (tape casting), aerografia (spray coating), serigrafia (screen printing), recobrimento por rotação (spin coating), dentre outras. 8,10,13,14,21 Quanto à espessura relativa das camadas, as células com configuração planar podem ser confeccionadas de três formas distintas, de acordo com a Figura 28. 8,48 A configuração planar suportada sobre o eletrólito apresenta maior resistência elétrica, exigindo altas temperaturas de operação (850-1000 ºC) para um bom desempenho.…”