ABSTRACT
Not all fluids are ejectable as monodisperse drops from drop-on-demand microdrop generators, and of those that are ejectable, not all can be ejected with a high enough degree of reliability to be used in a set-and-forget, autonomous, operational mode. The fact that for reliable operation, the working fluid for microdrop ejectors must be a very painstakingly engineered liquid is an unpleasant truth that one does not often find mentioned in marketing literature for commercial microdrop dispensing hardware.
