Reactive Magnetospinning of Nano‐ and Microfibers. Issue 46 (25th September 2015)

• Record Type: Journal Article
• Authors: Tokarev, Alexander; Trotsenko, Oleksandr; Asheghali, Darya; Griffiths, Ian M.; Stone, Howard A.; Minko, Sergiy
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 46(2015)
• Page Start: 13613
• Page End: 13616
• Publication Date: 2015-09-25
• Subjects: materials science -- nanoparticles -- nanostructures -- nanotechnology -- polymerization; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201506796
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Reactive spinning of nano‐ and microfibers that involves very fast chemical reactions and ion exchange is a challenge for the common methods for nanofiber formation. Herein, we introduce the reactive magnetospinning method. This procedure is based on the magnetic‐field‐directed collision of ferrofluid droplets with liquid droplets that contain complementary reactants. The collision, start of the chemical reaction, and the fiber drawing are self‐synchronized. The method is used to synthesize, cross‐link, and chemically modify fiber‐forming polymers in the stage of fiber formation. The method provides new opportunities for the fabrication of nanofibers for biomedical applications. Abstract : A new spin : Magnetic forces experienced by a droplet of polymer solution (for example, alginate in water) loaded with Fe3 O4 nanoparticles are used to pull the droplet through another droplet of solution loaded with a cross‐linker (for example, Ca 2+ ions), rapidly mix the droplets, form a liquid thread, and stretch it into a fiber (see figure). This method can be used to produce nano‐ and microfibers that are free of magnetic particles.