Nano Focus: Magnetic ferrofluid key to new take on spinning polymer fibers
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ofluid key to new take on spinning polymer fibers
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materials 36 624
MRS BULLETIN
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online
magnetospinning, a new technique for drawing nanofibers of virtually any polymeric material using an external magnetic field. This method, as reported in the June 11 issue of Advanced Materials (DOI: 10.1002/adma.201500374; p. 3560), begins with the addition of small amounts of commercially available Fe3O4 magnetic particles into a polymer material dissolved in solution. This essentially creates a ferrofluid, which is a liquid suspension of ferromagnetic particles. In the absence of an external magnetic field, ferrofluids behave as a normal liquid; but with the application of a magnetic field, these liquids will respond as if alive. The researchers developed a simple setup using a small permanent magnet mounted on a spinning circular stage placed near the needle end of a syringe containing the polymeric ferrofluid. An automated pump system compresses the syringe, which forms a droplet of the ferrofluid on the end of the needle. As the magnet approaches the needle, the magnetic droplet is attracted, reaching out and forming a liquid bridge between the needle and the magnet. As the stage continues to rotate, the ferrofluid is drawn from the needle and wound around the
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VOLUME 40 • AUGUST 2015
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www.mrs.org/bulletin
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