Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 401, Issue -, Pages 1054-1059Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2015.10.112
Keywords
Magnetophoresis; Ferrofluid; Nanocomposite; Additive manufacturing; Polymer matrix; composite
Funding
- Natural Sciences and Engineering Research Council of Canada Discovery Grant (NSERC-DG) [RGPIN-2014-04066]
- Canada Foundation for Innovation John R. Evans Leaders Fund (CFI-JELF) [33016]
- Ontario Research Fund Research Infrastructure (ORF-RI) grants
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We print complex curvilinear microstructures in an elastomer matrix using a ferrofluid droplet as the print head. A magnetic field moves the droplet along a prescribed path in liquid polydimethylsiloxane (PDMS). The droplet sheds magnetic nanoparticle (MNP) clusters in its wake, forming printed features. The PDMS is subsequently heated so that it crosslinks, which preserves the printed features in the elastomer matrix. The competition between magnetic and drag forces experienced by the ferrofluid droplet and its trailing MNPs highlight design criteria for successful printing, which are experimentally confirmed. The method promises new applications, such as flexible 3D circuitry. (C) 2015 Elsevier B.V. All rights reserved.
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