Spindt-type field-emission cathodes for use in electric propulsion (EP) systems having self-assembling nanostructures that can repeatedly regenerate damaged cathode emitter nanotips. A nanotip is created by applying a negative potential near the surface of a liquefied base metal to create a Taylor cone...http://www.google.fr/patents/US8080930?utm_source=gb-gplus-shareBrevet US8080930 - Self-regenerating nanotips for low-power electric propulsion (EP) cathodes
Self-regenerating nanotips for low-power electric propulsion (EP) cathodes
