Patent ID: 7849850

Claim:
An apparatus for electrohydrodynamic spraying having a power source and further comprising: a shroud defining a spray passage having a longitudinal axis, defined by downstream and upstream ends; a spray nozzle comprising at least one spray site and a liquid supply passage having a liquid to be aerosolized contained therein, said nozzle configured to aerosolize liquid received from the liquid supply passage and to release charged aerosol particles toward the downstream end of said longitudinal axis; a discharge electrode positioned upstream of said spray site and comprising at least one discharge point, said electrode shielded from said aerosolized liquid by said shroud being positioned between said at least one spray site and said at least one discharge point and configured to produce a cloud of positively charged ions when a voltage is applied thereto; wherein said power source is operatively connected to said discharge electrode; and wherein said power source is operatively connected to said nozzle, spray site, liquid supply passage, or to a metal electrode in liquid supply passage.