Preparation of Ag Nanoparticles in Ammonia by Using EDM and a Study of the Relationships Between Ammonia and Silver Nanoparticles

摘要

This study used deionized water and ammonia (0.02%) as dielectric fluids and then employed electronic discharge machine to ionize them, with the arc-focused energy melting the surface of silver electrode rods. After the condensation of the dielectric fluid, silver nano-colloids were prepared under two conditions, named as Ag and Ag(NH3), respectively. The optical properties of the two samples were compared by a UV-Vis spectrum analyzer (UV-Vis), and the zeta potential was measured by Zetasizer. We then utilized a transmission electron microscope to observe the shape, size, and distribution of silver nanoparticles. The results showed that with the addition of NH3, the size of silver nanoparticles decreased, the concentration of nano-colloid increased, and the dispersive suspension of nano-colloid became better.