Characteristics of high current nanosecond discharge in the air above surface the copper sulfate solution in distilled water


Introduction. The discharges with liquid electrodes have received an extensive development in modern water treatment systems, at drawing various coatings, in synthesis of ozone and metal nanostructures. High current nanosecond discharges with the liquid electrode are the least studied. This hinders understanding of physics processes and optimize their various applications.
Purpose. The purpose of this work is investigation of characteristics of the reactor with high current nanosecond discharge in the "metal blades – electrolyte surface" system in air of atmospheric pressure, which can be used for synthesis of colloidal solution based on copper nanostructures.
Methods. In the work the optical-spectroscopic method of investigation of the discharge plasma with a high time resolution has been used.
Results. The results of investigation of electrical and optical characteristics of the high current nanosecond discharge on the surface of copper sulfate solution (1-20%) in distilled water are presented. The discharge electrical peak power is order of 2 MW, and the energy input in plasma is about 80 mJ. In the plasma emission spectrum the bands of nitrogen molecules and molecular degradation products of copper sulfate are registered. The influence of plasma on the solution causes to its color change from blue to green, indicating the copper nanostructure formation.
Conclusion. The experiments have revealed suitability of the developed device for the synthesis of copper nanostructures in the colloidal solution based on the water and copper sulfate. Its have established the basic conditions for sustainable ignition of the discharge in air of atmospheric pressure

Keywords: nanosecond discharge, water, air, copper sulfate solution, nanostructures