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Axisymmetric instabilities in electrospinning of highly conducting, viscoelastic polymer solutions

Phys. Fluids 21, 103101 (2009); doi:10.1063/1.3246024

Published 12 October 2009

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Colman P. Carroll and Yong Lak Joo
School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, USA
In this paper the axisymmetric instabilities observed during the electrospinning of highly electrically conducting, viscoelastic poly(ethylene oxide) (PEO)/water solutions are investigated. In our theoretical study, a linear stability analysis is coupled with a model for the stable electrospun jet. The combined model is used to calculate the expected bead growth rate and wave number for given electrospinning conditions. In the experimental section of the study, PEO/water solutions are electrospun and the formation of axisymmetric beads is captured using high-speed photography. Experimental values for the bead growth rate and wave number are extracted and compared with the model predictions. An energy analysis is then carried out on the stability results to investigate the mechanism of instability via the coupling between base flow and perturbation. The analysis reveals that the unstable axisymmetric mode for electrically driven, highly conducting jets is not a capillary mode, but is mainly driven by electrical forces due to the interaction of charges on the jet. We note that this axisymmetric, conducting mode often exhibits a growth rate too small to be observed during electrospinning. However, both our experiments and stability analysis demonstrate that the axisymmetric instability with a high growth rate can be seen in practice when the electrical force is effectively coupled with viscoelastic forces. ©2009 American Institute of Physics
History: Received 14 April 2009; accepted 21 September 2009; published 12 October 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/103101/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.57.Ng
    Fluid dynamics of polymers and polymer solutions
  • 47.55.nb
    Capillary and thermocapillary flows
  • 81.20.-n
    Methods of materials synthesis and materials processing
  • 47.60.Kz
    Flows and jets through nozzles
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
1070-6631 (print)   1089-7666 (online)
Publisher:
AIP is a member of CrossRef AIP

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