Abstract
To develop a process of fine particle production by spray pyrolysis, spray combustion of W/O (water-in-oil) emulsion, of which water phase was raw material solution and oil phase was fuel for heat source of high-temperature reaction field, was investigated. In this study, nickel oxide particles, which were a preliminary step of the nickel fine particle production, were synthesized and its structural characteristics were evaluated. Mixed solution of nickel nitrate and white kerosene was used as raw material. W/O emulsions were prepared using ultrasonic homogenizer and stirring these raw materials adding a surfactant. These emulsions were burning in a high temperature furnace to produce nickel oxide particles. The mean particle diameter of produced particles was less than 20 nm according to TEM observation. The diameter of the particles was much smaller than the estimated value based on the size distribution of dispersed solution phase in the emulsions and its concentration. Moreover, there is no effect of the concentration of the aqueous solution phase. On the other hand, X-ray diffraction pattern showed that the produced particles were complex of metal nickel with nickel oxide.Graphic abstract
Highlights
Spray pyrolysis is one of the methods for fine particle production [1,2,3] and a droplet of precursor solution or slurry is a template of a produced particle
Particle production by W/O emulsion combustion has already been reported [13,14,15], the W/O emulsions have been prepared by simple stirring and the size of water phases is not small enough for nano-particle production of less than 1 m [16]
The following was clarified: 1. The diameter of primary particles produced from W/O emulsion was approximately 10 nm based on TEM observation
Summary
Spray pyrolysis is one of the methods for fine particle production [1,2,3] and a droplet of precursor solution or slurry is a template of a produced particle. We proposed production method for the ultrafine particle by the combustion of W/O emulsion prepared by ultrasonic homogenizer [12]. In this method, a large amount of W/O emulsion that included fine and uniform droplets of a metallic salt solution can be fed to a reactor at a time. There has been little reporting of the relationship between particle morphology and water phase structure in the emulsion
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