An apparatus includes a first belt having an external surface, a second belt having an external surface opposite the external surface of the first belt, and a region in which the first belt and the second belt come in contact, a first material dispenser and a second material dispenser to dispense a first material and a second material on the external surface at least one of the first and second belts, and a power source to cause at least one of the first and second belts to move to cause the external surfaces of the first and second belts to contact and then diverge away from each other so that at least one of the first and second materials forms filaments that break up as the belts continue to diverge.

In one embodiment, systems and methods include an electrospray device for atomizing fluids comprising a body defining a resonant microwave cavity, wherein the body comprises a radio frequency inlet configured to inject a radio frequency signal received from a power source into the resonant microwave cavity, wherein the resonant microwave cavity is configured to to amplify a voltage of the radio frequency signal. The device further comprises a field concentrating pole disposed within the resonant microwave cavity configured to concentrate the amplified voltage at a first end of the field concentrating pole to form an electric field. The device further comprises a nozzle disposed at the first end of the field concentrating pole and a fluid supply line configured to provide a fluid disposed within the field concentrating pole and fluidly connected to the nozzle, wherein the fluid supply line is fluidly connected to a fluid source.