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Enhanced Stability of Electrohydrodynamic Jets through Gas Ionization Sibel Korkut, Dudley A. Saville,* and Ilhan A. Aksay
 

Summary: Enhanced Stability of Electrohydrodynamic Jets through Gas Ionization
Sibel Korkut, Dudley A. Saville,* and Ilhan A. Aksay
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544-5263, USA
(Received 4 July 2007; revised manuscript received 5 November 2007; published 25 January 2008)
Theoretical predictions of the nonaxisymmetric instability growth rate of an electrohydrodynamic jet
based on the measured total current overestimate experimental values. We show that this apparent
discrepancy is the result of gas ionization in the surrounding gas and its effect on the surface charge
density of the jet. As a result of gas ionization, a sudden drop in the instability growth rate occurs below a
critical electrode separation, yielding highly stable jets that can be used for nano- to microscale printing.
DOI: 10.1103/PhysRevLett.100.034503 PACS numbers: 47.65.d, 47.85.Dh, 52.80.s, 68.03.g
Electrohydrodynamic (EHD) jets [1] emitted from liq-
uid cones undergo various modes of instabilities [2,3]
which cause them to break into droplets or whip before
reaching the opposite electrode. The droplet formation and
the whipping phenomenon have been utilized in many
technologically important applications including electro-
spraying [4] and electrospinning [5]. A most recent trend
has been on printing with the liquid jet [613] nano- to
micrometer size features when the whipping instability
disappears while the counter electrode is in close proximity

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science