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Tailoring the hydraulic impedance of out-of-plane micromachined electrospray sources with integrated electrodes

Appl. Phys. Lett. 94, 163502 (2009); doi:10.1063/1.3117191

Published 21 April 2009

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R. Krpoun,1 K. L. Smith,2 J. P. W. Stark,2 and H. R. Shea1
1Ecole Polytechnique Fédérale de Lausanne, Microsystems for Space Technologies Laboratory, 2002 Neuchâtel, Switzerland
2School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
Hydraulic impedance is a critical parameter for the operation of electrospray emitters, and for preventing flooding when spraying from arrays of emitters. Controlling flow rate by tuning the flow impedance allows accessing different operating modes, such as droplet, ionic, or pulsating. We report on a method to tailor the hydraulic impedance of micromachined capillary out-of-plane emitters with integrated extractor electrodes by filling them with silica microspheres. Spraying the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4), we demonstrate the ability to tune from droplet emission to pure ion emission depending on microbead diameter, obtaining stable emission from single emitters and from arrays of 19 emitters. ©2009 American Institute of Physics
History: Received 7 January 2009; accepted 14 March 2009; published 21 April 2009
Permalink: http://link.aip.org/link/?APPLAB/94/163502/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.61.-k
    Micro- and nano-scale flow phenomena
  • 85.85.+j
    Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
  • 47.55.D-
    Drops and bubbles
  • 47.55.nb
    Capillary and thermocapillary flows
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (16)
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