Effect of SDS on the Dispersion Stability of Ysz Particles in an Electroless Nickel Solution

Abstract

Optimum particle dispersion is an essential feature for composite coatings carried out on the autocatalytic electroless nickel plating platform. In this regard, the potential influence of an anionic surfactant, sodium dodecyl sulphate (SDS), on the dispersion stability of a ceramic, yttria stabilized zirconia (YSZ), in an acidic electroless nickel solution of pH 4.9 has been assessed in this study. Ultra violet-visible spectrophotometry was used in accordance with the Beer-Lambert law (-log (I 1 = I 0 ) ¼ A) to evaluate the rate of YSZ particle sedimentation in electroless nickel solutions with and without surfactant. Measurement of the particles' zeta potential at each surfactant concentration was conducted in parallel with the UV-vis tests with the aim of establishing the interaction among the surfactant, YSZ particles, and electroless nickel solution. A slight increase in the negative magnitude of the particles' zeta potential indicated the adsorption of SDS onto the particles' surface and a possibility of contributing to its stability. However, the surfactant's inability to counteract an electroless nickel solution-induced particle accretion resulted in the observation of poor YSZ particle stabilities at all the investigated surfactant concentrations.Electroless co-deposition of nickel and the ceramic yttria stabilized zirconia (YSZ) recently emerged as a method of manufacturing solid oxide fuel cell (SOFC) electrodes (Davidson and Waugh, 2009). Its non-requirement of a high energy sintering stage not only significantly reduces currently high SOFC manufacturing costs, but also offers an opportunity to eliminate certain high-temperature related problems such as material warpage. While nickel provides the essential platform for electronic conductivity and fuel catalysation, YSZ, in addition to preventing the coarsening of nickel at high operating temperatures ($1000 C), relieves the thermal expansion mismatch between the anode and the electrolyte. Electroless nickel solution is the medium wherein the co-deposition process occurs. Addition of second-phase particles such as YSZ to the solution results in the manufacture of a composite coating.

Effect of surface modification of ceramic particles by SDS on the electrical properties of PZT-PVDF and BT-PVDF composites: interface effect

“…1a, b and the values obtained are -12.97 and -8.04 mV respectively. The negative value of zeta potential indicates the negative surface charge on the SDS treated ceramic particles which arise due to electrostatic interactions between the surface of ceramic particles and the SDS molecules in aqueous solutions at lower temperature [16,17]. This behaviour suggested that the negatively surface charged particles hinder agglomeration and further favoured the uniform distribution of ceramic particles in DMF solvent.…”

Assessment of Tribological behavior of nickel-nano Si3N4 composite coatings fabricated by pulsed electroplating process

“…Consequently particles incorporation into the nickel matrix become more uniform and in some cases even the porosity of the coatings can be reduced [16,22]. It should be noted that the optimum concertation of SDS should be used, otherwise excess SDS will exert detrimental effect on the coating [23,22,24]. An Aldrich silicon nitride (Si 3 N 4 ) powder was chosen for this study.…”

Copper-catalyzed electroless nickel coating on poly(ethylene terephthalate) board for electromagnetic application

“…Many industries benefit from the use of electroless Ni deposits including oil and gas, automotive, electronics, microelectronics, aerospace and decoration [1,2]. Electroless Ni deposits are produced by the autocatalytic electrochemical reduction of nickel ions from the plating solution by means of a chemical redox [3,4].…”