Journal
MATERIALS
Volume 13, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/ma13010047
Keywords
electrospinning; magnetic nanofibers; magnetite; magnetic field lines; Ampere's right-hand grip rule; Maxwell equations
Categories
Funding
- Volkswagen Foundation grant Adaptive Computing with Electrospun Nanofiber Networks [93679]
- Open Access Publication Fund of Bielefeld University of Applied Sciences
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [414001623]
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Electrospinning can be used to create nanofibers from diverse polymers in which also other materials can be embedded. Inclusion of magnetic nanoparticles, for example, results in preparation of magnetic nanofibers which are usually isotropically distributed on the substrate. One method to create a preferred direction is using a spinning cylinder as the substrate, which is not always possible, especially in commercial electrospinning machines. Here, another simple technique to partly align magnetic nanofibers is investigated. Since electrospinning works in a strong electric field and the fibers thus carry charges when landing on the substrate, using partly conductive substrates leads to a current flow through the conductive parts of the substrate which, according to Ampere's right-hand grip rule, creates a magnetic field around it. We observed that this magnetic field, on the other hand, can partly align magnetic nanofibers perpendicular to the borders of the current flow conductor. We report on the first observations of electrospinning magnetic nanofibers on partly conductive substrates with some of the conductive areas additionally being grounded, resulting in partly oriented magnetic nanofibers.
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