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Fabrication and Assembly of Magneto-Responsive, Anisotropic, and Hybrid Microparticles of Variable Size and Shape

Authors

  • Dr. Su Yeon Lee,

    1. Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104 (USA)
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  • Prof. Shu Yang

    Corresponding author
    1. Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104 (USA)
    • Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104 (USA)
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  • The research is supported in part by the National Science Foundation (NSF)/EFRI award, grant no EFRI-1038215, and University Research Foundation grant at Penn. The Penn Regional Nanotech facility (PRNF) is acknowledged for access SEM.

Abstract

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Molded magnets: The co-assembly of silica colloids and iron oxide nanoparticles in a PDMS mold gives magnetic responsive microparticles. When dispersed in an aqueous solution (see picture), the microparticles could rotate and flip under the action of a magnetic field (1 kG). The particles could also be reversibly switched between aligned chain structures and a hexagonal array in both bulk solutions and in emulsion droplets.

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