An electrostatic spraying nozzle in which at least a portion of the inner surface thereof consists of a polymeric material containing a pyropolymeric semi-conducting organic refractory oxide material will be provided with means for applying an electrical potential to said polymeric material containing a pyropolymeric semi-conducting organic refractory oxide material whereby an electrical charge will be imparted to any material being discharged through the nozzle.

A system for electrostatic spraying of liquids, such as agricultural pesticides, paints and other liquids, which relies on a novel spray nozzle that combines pneumatic atomization and electrostatic induction charging to provide a stream of electrostatically charged fine droplets. The nozzle uses a low voltage power supply, e.g. a 12 volt battery, electronically raises the voltage to a level in the range of several hundred to several thousand volts, and applies the high voltage to an annular induction electrode which is embedded in the spray nozzle. The high voltage components are inside the nozzle, which is made of an electrically insulating material, to minimize the danger of shock and the possibility of mechanical damage to the high voltage components. The spray nozzle operates at a relatively low voltage and at a low input power, but provides a droplet stream at a high droplet charging level, for effective and uniform deposition of the sprayed liquid onto the target.

An electrostatic spraying device comprising a high voltage generating circuit powered by a low voltage circuit comprising one or more radiation sensitive elements and charge storage means.