Authors
S. Peyman Shariatpanahi
Daniel Bonn
Mohammad R. Ejtehadi
Azam Iraji Zad
Date (dd-mm-yyyy)
2016-06-01
Title
Electrical bending instability in electrospinning visco-elastic solutions
Journal
Journal of Polymer Science, Part B, Polymer Physics
Volume
54
Publication Year
2016-06-01
Pages
1036-1042
Issue number
11
Document type
Article
Faculty
Faculty of Science (FNWI)
Institute
Van der Waals-Zeeman Institute (WZI)
Abstract

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.

URL
go to publisher's site
Permalink
https://hdl.handle.net/11245.1/ed897f78-3885-4972-a47d-45ef1dea7f8c