Characteristics of bubble discharge driven by the different pulse power supply

The plasma power supply directly affects the plasma-liquid interaction, which are reflected visually by electrical properties and solution properties. In this paper, the characteristics of bubble discharges and the solution properties driven by nanosecond and microsecond pulse power supplies were investigated. The results show that the nanosecond pulse bubble discharge (NPBD) presents a single current at the rising edge of the voltage, while multi-currents mode is observed in the microsecond pulse bubble discharge (MPBD). The current intensity of NPBD is much higher than that of MPBD. The pulse frequency and voltage amplitude have different effects on the current. The effect of the two power sources on the effectiveness of reactive species is positively correlated with power and less correlated with the type of power source. The difference of the solution pH in the NPBD and MPBD is mainly related to the concentration of aqueous reaction species. The solution temperature is apparently lower in the NPBD when the voltage varies, which has a greater relationship with its pulse characteristics.