Loading...

Electrical bending instability in electrospinning visco-elastic solutions

Shariatpanahi, S. P ; Sharif University of Technology

445 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/polb.24029
  3. Publisher: John Wiley and Sons Inc
  4. Abstract:
  5. The electrical bending instability in charged liquid jets is the phenomenon determining the process of electrospinning. A model of this phenomenon is lacking however, mostly due to the complicated interplay between the viscosity and elasticity of the solution. To investigate the bending instability, we performed electrospinning experiments with a solution of polyethylene oxide in water/ethanol. Using a fast camera and sensitive multimeter, we deduced an experimental dispersion relation describing the helix pitch length as a function of surface charge. To understand this relation, we developed a theoretical model for the instability for a wide range of visco-elastic materials, from conducting to nonconducting. The theoretical dispersion relation shows good agreement with the experimental results. Using the new model, we find that the elastic tension in the visco-elastic threads plays an important role in triggering the instability
  6. Keywords:
  7. Dispersions ; Elasticity ; Fibers ; Polyethylene oxides ; Quantum theory ; Rheology ; Spinning (fibers) ; Stability ; Viscoelasticity ; Bending instability ; Charged liquids ; Dispersion relations ; Elastic tension ; Helical structures ; Theoretical modeling ; Visco-elastic material ; Viscoelastic properties ; Electrospinning
  8. Source: Journal of Polymer Science, Part B: Polymer Physics ; Volume 54, Issue 11 , 2016 , Pages 1036-1042 ; 08876266 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/polb.24029/abstract?systemMessage=Wiley+Online+Library+will+be+unavailable+on+Saturday+7th+Oct+from+03.00+EDT+%2F+08%3A00+BST+%2F+12%3A30+IST+%2F+15.00+SGT+to+08.00+EDT+%2F+13.00+BST+%2F+17%3A30+IST+%2F+20.00+SGT+and+Sunday+8th+Oct+from+03.00+EDT+%2F+08%3A00+BST+%2F+12%3A30+IST+%2F+15.00+SGT+to+06.00+EDT+%2F+11.00+BST+%2F+15%3A30+IST+%2F+18.00+SGT+for+essential+maintenance.+Apologies+for+the+inconvenience+caused+