Patent ID: 9108217
Filing Date: 2015-08-18
Classification: A61L,B05B,B05D

Abstract:
1. A method of electrospraying nanoparticles on to a surface, the method comprising: providing a first liquid diluent to a first outer opening of a first spray head and a first liquid spray composition to a first inner opening of the first spray head, the first inner opening concentric with the first outer opening, wherein the first liquid spray composition includes an active ingredient and a polymer, and wherein the first liquid diluent includes a solvent with a dielectric constant greater than ten to at least partially dissolve the polymer; providing a second liquid diluent to a second outer opening of a second spray head and a second liquid spray composition to second inner opening of the second spray head, the second inner opening concentric with the second outer opening; charging the surface with an ionizer; applying a potential difference in a range of between about 2.5 kilovolts to about 6 kilovolts between the surface and the first spray head; spraying the first liquid diluent and the first liquid spray composition simultaneously from the first spray head onto the surface in a first pass relative to the surface to provide positively charged particles to the surface, wherein a flow rate of the first liquid diluent is less than five times the flow rate of the first liquid spray composition; and spraying the second liquid diluent and the second liquid spray composition from the second spray head onto the surface in a second pass relative to the surface to increase a depth of bound coating and provide negatively charged particles on the positively charged particles, the second pass occurring at a time after the first pass has completed, wherein a flow rate of the second liquid diluent is less than five times the flow rate of the second liquid spray composition.