Wetting of nickel by silver

A Spray Pyrolysis Approach for the Generation of Patchy Particles

“…The formation of the Ag layer on the surface could be attributed to two reasons. One is the immiscibility of Ag and Ni, and the other is the low-wetting angle between Ag and Ni; in helium silver was reported to form a 9 o contact angle on nickel (Nagesh and Pask 1983). During the particle formation process, one possible reaction process, based upon our observations of single component AgNO 3 decomposition (Zhong et al 2003) is that AgNO 3 and Ni(NO 3 ) 2 hydrolyzed and decomposed to oxide, and then the oxides were reduced to metallic Ag and Ni.…”

Role of initial microstructure on nickel-YSZ cathode degradation in solid oxide electrolysis cells

“…Another effect of the decreased surface Ni content was to lessen the contact area between the AgePd current collection paste and Ni in favor of contact between AgePd and YSZ. While Ag contacts well with Ni in a low-oxygen environment [33], metal to oxide contact is known to be poor in such environments [34]. The resulting poor contact between AgePd and YSZ could significantly decrease the area for electrical contact and cause significant performance degradation.…”

The spreading kinetics of Ag–28Cu(L)on nickel(S): Part I. Area of spread tests on nickel foil

“…30 In high-temperature reactive systems, the end of spreading often occurs when either a quasistatic or equilibrium contact angle is reached. 32 In air, the steady-state contact angle at this temperature is 90 ± , which reflects the new interfacial equilibrium of Ag͞NiO. 32 In air, the steady-state contact angle at this temperature is 90 ± , which reflects the new interfacial equilibrium of Ag͞NiO.…”

“…17,25,26,32 Instantaneous spreading (contact angle zero) will not occur if there is merely dissolution of a component from the solid phase into the liquid since the liquid-vapor interfacial energy if affected, but not the driving force for wetting. Pask and co-workers in studies of a variety of liquid-solid systems have shown that spreading (contact angle zero) will occur only if there is solution of a component of the liquid phase in the solid and there is a sufficient contribution from the specific free energy of the reaction to the driving force for wetting (solid-vapor interfacial energy minus the liquid-solid interfacial energy).…”