Dynamics of an electrically charged polymer jet

Abstract

Subbotin, A.; Stepanyan, R.R.; Chiche, A.; Slot, J.J.M.; Brinke, ten, G. Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Electro-hydrodynamic equations describing the behavior of a charged polymer jet are analyzed by analytical methods and scaling approach. A FENE-P constitutive equation is employed to describe the viscoelastic properties of a conducting polymer liquid. Effects of the electric field, the flow rate, and the material parameters on the jet dynamics are investigated. Four different regimes are examined. In particular, a regime in which the electric current is linearly proportional to the electric field and independent on the flow rate and a regime in which the electric current is linearly proportional to the flow rate and independent on the electric field are identified. An operating window limiting the region of a stable cone-jet mode is also considered. C 2013 AIP Publishing LLC. [http://dx

Extension rate of the straight jet in electrospinning of poly(N‐isopropyl acrylamide) solutions in dimethylformamide: Influences of flow rate and applied voltage

“…By contrast, the 17 wt % solution possesses an n value of 0.49–0.60. Previous articles have shown that the exponent n is 0.25 provided that the inertial and electric forces are dominant in less viscous solutions – . For the more viscous solution, the exponent n is 0.5 when rheological force, rather than inertial force, dominates.…”

“…Previous articles have shown that the exponent n is 0.25 provided that the inertial and electric forces are dominant in less viscous solutions. 7,[14][15][16] For the more viscous solution, the exponent n is 0.5 when rheological force, rather than inertial force, dominates. Thus, electrical force is counterbalanced with inertial force in the 9 wt % PNIPAM solution with a viscosity of 108 mPa s. As solution concentration increases to 17 wt % with a viscosity of 1115 mPa s, the rheological force that is associated with the high solution viscosity should be considered.…”

Simplified modeling of the electrospinning process from the stable jet region to the unstable region for predicting the final nanofiber diameter

“…The electrically conducting polymer solution, characterized by its density (q), surface tension (g), dynamic viscosity (h), electrical conductivity (k), and dielectric constant, was pumped at a Q out of an orifice of a metal syringe with an initial radius r 0 . 21 This E generated a tangential force on the charges distributed at the jet surface. Upon the application of a high voltage, the electrodes generated a homogeneous electric field strength (E 1 ) directed horizontally from the needle toward the collector.…”

“…16,[21][22][23][24][25] Although I can be measured experimentally 23 by the connection of a resistor between the collector and the ground, Bhattacharjee et al 25 reported that I measured in electrospinning scales as the product E 1 Q 0.5 k 0.4 for wide polymer solutions in an organic solvent could be expressed as follows: The processing parameters E 1 and Q and the solution k can be used to determine I flowing through the jet with current-voltage relationships reported for electrospinning experiments.…”

Fiber diameter control in electrospinning

“…Also, the nature of the charge transport changes from the conductive current in the cone part to a convective charge transport in the jet: 10 charge is virtually "frozen" onto the surface of the jet and is moved down only by advection, together with the jet. Typically, the jet diameter at the end of its straight part is insensitive to the nozzle dimensions 11 and is of the order of 10 lm for the solutions studied here.…”