High Frequency AC Electrosprays:
Mechanisms And Applications
Author(s)
L. Y. Yeo & H.-C. Chang
Abstract
We have recently discovered a new electrospray phenomenon using high frequency
AC electric fields beyond 10 kHz which behaves very distinctly from its DC electrospray
counterpart. Experimental and theoretical findings have demonstrated that
plasma charging plays a significant role in the electrohydrodynamically-driven
interfacial dynamics of the electrospray. These findings show that Faradaic generation
of interfacial plasma polarized layers can produce a net normalMaxwell stress
that is responsible for the generation of aerosol drops. Experimental results of this
plasma polarization phenomenon are presented and scaling theory is employed
to elucidate the underlying plasma mechanism responsible for the phenomenon.
The AC electrospray is capable of producing micron and sub-micron electroneutral
drops or polymeric fibers and is a promising rapid and portable technology
for drug encapsulation or biomaterials synthesis for controlled release respiratory
drug delivery, wound care therapy or tissue/orthopaedic engineering.
1 Introduction
DC electric fields have mainly been used in electrohydrodynamic atomization (otherwise
known as electrospraying) [1]. Several DC electrospray modes have been
observed [2], the predominant mode being the cone-jet mode in which the liquids
meniscus assumes the shape of a sharp cone with half angle approximately equal
to the Taylor angle of 49.3o, obtained by balancing the electrostatic and capillary
pressures acting on a conical surface for ideal, static equilibrium conditions [3].
Keywords
Related Book
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