Abstract
The development of an aerosol generator is reported. It makes use of a strong electric field, in which a pendular droplet deforms into a conical shape. This cone shaped droplet is known as the Taylor cone. From the tip of the cone droplets are generated at a frequency of about 10 8–10 10 Hz. The initially highly charged droplets repel each other thus preventing coalescence but can be neutralized by use of a strategically-placed needle of opposite polarity. In this study droplets of ethylene glycol were produced, whose modal diameter varied with increasing potential between 1.33 and 1.55 μm. Their standard deviation decreased from 0.3 to 0.2 μm. By using mixtures of DOP and ethanol, droplets of DOP as small as 0.08 μm were produced by evaporation of the ethanol. A calibration curve for the droplets produced before and after evaporation is given for this particular apparatus configuration. The Taylor cone exhibits current-voltage characteristics which are analogous to those of a corona discharge. Other phenomena characterizing corona discharge are also found.
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