A particle delivery device for producing a spray of particles in an ambient gas at an ambient pressure includes a storage volume for a liquid substance； a nozzle having an inlet and an outlet, the nozzle inlet being coupled to the storage volume in fluid communication, and an electric supply for providing an electric field between the nozzle outlet and a counter electrode. The storage volume is gastight, comprises a moveable wall and is adapted to provide the liquid substance to the nozzle inlet at ambient pressure level. The electric supply is arranged to control a release of the liquid substance from the nozzle outlet by a control of the electric field.
