ABSTRACT
Fluid microdrops are very easily given large electric charges that can then be used to control their positions and velocities. Even if one does not intend to use electric fields to control the motion of the ejected drops, drop charging is not a phenomenon that can be safely ignored. Drops that are produced with large amounts of charge can explode upon slight evaporation or be drawn back into the ejection aperture surface by electrostatic attraction after breaking off from the fluid jet. Interdrop electrostatic forces can affect the stability of ejected droplet streams and droplet arrays.
