Revealing novel power laws and quantization in electrospinning considering jet splitting – towards predicting fiber diameter and its distribution

01.07.2019 von 16:00 bis 17:00

Friedrich-Alexander University Erlangen-Nürnberg (FAU), Faculty of Engineering, Department of Materials Science, Institute of Polymer Materials, Martensstraße 7, 91058 Erlangen, Germany

Bavarian Polymer Institute
Key Lab Advanced Fiber Technology, Dr.-Mack-Straße 77, 90762 Fürth, Germany

dirk.schubert@fau.de


A review of  available theories or models for electrospinning is given, from which the weaknesses become evident. As a consequence a novel theory is given to predict the fiber diameter resulting from electrospinning and its distribution. In particular, scaling laws are predicted based on fundamental physics and revealing some peaks in the fiber diameter distribution are not “experimental failure”, but are physical consequences of jet splitting, appearing as an indication of quantization of the fiber diameter. The key approach is the separation of electrospinning into a flow-dominated and a drying-dominated regime, where jet-splitting occurs at the transition from the one to the other regime. A clear recommendation is given for analyzing experimental data to challenge the predicted scaling laws. The work opens a door towards the design of the electrospinning fiber diameter and its distribution due to the separation of effects considering charge density, adjustable by salts, and surface tension, adjustable by surfactants, which are linked by viscosity.

Three stages for the electrospinning process

Figure 1. Three stages for the electrospinning process.

 

Acknowledgement: This work was motivated by the SFB TRR 225.

References: D. W. Schubert, Macromolecular Theory and Simulation, in print, 2019.

 

Diesen Termin meinem iCal-Kalender hinzufügen

zurück