The Research Of Character Of Microemulsion And Preparation Of Nickel Sulfide Ultrafine Particles

The inner core of microemulsion can dissolve water to form water core called water pool, little water pools of microemulsion that are surrounded by the single molecule interface formed by surfactant and cosurfactant, and form particles whose sizes are tens or hundreds of A. In this paper, a microemulsion-based method, and the conditions and mechanism of growth of NiS particles for the synthesis of nanosize nickel sulfide particles are reported.By determining the conductivity and phase graph, this paper research that electrolytes nickel nitrate have effect on the stability of microemulsion Triton X-100/n-hexane/cyclohexane/water or nickel nitrate, and the conductivity mechanism of microemulsion by the curve of microemulsion conductivity. We found that the conductivity of microemulsion whose disperse phase is water increase then decrease when water to surfactant molar ratio W is raised, and the more cyclohexane to Triton X-100 molar ratio, the lower the conductivity of microemulsion whose disperse phase is Ni(NO3)2 solution increasing. By phase graph we research the effect of electrolytes the water tolerance of microemulsion. When microemulsion's disperse phase is strong electrolytes, the water tolerance of microemulsion is much less than water. In short, when the strong electrolytes has salt out effect on nonionic microemulsion, the addition of electrolytes reduces the stability of microemulsion. The more the concentration of electrolytes, the less the stability of microemulsion.We report the synthesis of nanosize nickel sulfide particles by a microemulsion-based method. We use UV -Vis spectrophotometer monitoring the growth process of the particles and use TEM to confirm the size of particles. By changing W, Ni/S molar ratio and the concentration of reactant, we study that various conditions have effect on particles, and put forward the mechanism of growth of NiS particles.