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UF_3010_jandrew - Advances in Nanocomposite Design Towards...

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Andrew Research Group -­‐ University of Florida Jennifer S. Andrew Dept. of Materials Science & Engineering, University of Florida Advances in Nanocomposite Design: Towards New Multiferroic Materials + + + + + + + + + + + + fiber formation + + + + + + + + + + + + evaporation sol-gel reaction particles ellipsoids fibers Funding: NSF CAREER Award FCASST Bill & Melinda Gates FoundaDon
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Andrew Research Group -­‐ University of Florida About Dr. Andrew: Sibling Rivalry 20 25 30 35 40 45 50 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 Dr. J. Andrew Dr. M. Andrew laDtude
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Andrew Research Group -­‐ University of Florida About Dr. Jennifer Andrew 20 25 30 35 40 45 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 laDtude
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Andrew Research Group -­‐ University of Florida Why Composites? SoQ Organic material surrounding hard inorganic material Nanobridges (30nm) at tablet interfaces Staggered tablets 8 μ m x 0.3 μ m (high aspect raDo) Outside layer: Hard prismaDc calcite . Prevents penetraDon; prone to bri]le failure Inside layer: Aragonite (Nacre) . SoQer, but tougher. Absorbs energy from impact
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Andrew Research Group -­‐ University of Florida Overview Multiferroics Motivations Single Phase Multi-phase Nanoparticle Properties Diagnostics Tissue Scaffolds Drug Delivery ferroelectrics ferroelastics ferromagnets
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Andrew Research Group -­‐ University of Florida Multiferroics ferroelectrics ferroelastics ferromagnets Multiferroic materials exhibit at least two types of ferroic ordering The interaction between the two types of ordering leads to additional interactions Magnetoelectric effect Spaldin, N., et al., Science 15, 391, 2005.
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Andrew Research Group -­‐ University of Florida Background: Multiferroic Motivations No material exists that has high permeability ( μ ) and high permittivity ( ε ) Possible applications include electromagnetic interference (EMI) filters, two-state memory devices, and biomedical To study the size effects of these properties, through synthesis of nanoparticles
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Andrew Research Group -­‐ University of Florida Magnetism Ferromagnetic materials have a permanent magnetization (e.g. Co, Fe, Ni) Antiferromagnetic and ferrimagnetic (e.g. Ferrites: MFe 2 O 4 , M=Fe, Ni, Zn, Co, Mn) materials moment align antiparallel
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Andrew Research Group -­‐ University of Florida Ferroelectricity Ferroelectric materials have a permanent dipole, and their dipole moment is not necessarily zero in the absence of an electric field Requires a noncentrosymmetric crystal structure Tetragonal Perovskite (P4mm) ( Ba Ti O 3 )
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