ABSTRACT
With the exception of the focused acoustic beam technique, all microdrop generation techniques require a part of the drop generator hardware: an ejection aperture nozzle consisting of a low fluid impedance hole that is the same diameter of the microdrops to be generated. Optimally constructed low fluid impedance nozzles in the 10-to 100-micron range are not, strictly speaking, off-the-shelf components, but there are some commercially available parts that can be utilized, and there are a number of ways with varying degrees of cost and complexity to fabricate microdrop ejection nozzles.
