Journal
JOURNAL OF APPLIED PHYSICS
Volume 107, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3277018
Keywords
electric field effects; electrical conductivity; electrospinning; polymer solutions; solvent effects
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Funding
- U.S. Army Research Office through the Institute for Soldier Nanotechnologies [W911NF-07-D-0004]
- National Science Foundation [DMR-0820484]
- Deutsche Forschungsgemeinschaft
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820484] Funding Source: National Science Foundation
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [907985] Funding Source: National Science Foundation
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The origin and scaling of the current measured during steady electrospinning of polymer solutions in organic solvents are considered. For a specified electric field strength E, flow rate Q, and conductivity K, the total measured current is shown empirically to scale as I-total similar to EQ(0.5)K(0.4), for a wide variety of polymer solutions with different electrical conductivities. It is also shown that I-total is composed of two distinct components: one that varies linearly with E, and another that is independent of E, but varies with the conductivity K of the fluid and the flow rate Q. The experimental evidence suggests that the latter component arises due to a secondary electrospray emanating from the surface of the jet. The consequence of this secondary electrospray mechanism on the final fiber size achieved during the electrospinning process is also discussed.
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