When 3:30 PM - 5:00 PM Sep 16, 2011
Where 1670 CSE
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Joseph Tracy, Materials Science and Engineering, North Carolina State University


Synthesis, Self-Assembly, and Transformations of Metal and Magnetic Nanoparticles

Ligand-stabilized nanoparticles are of significant interest for their size- and shape-tunable physical properties, and the ligand monolayers facilitate self-assembly.  New approaches for synthesizing and assembling nanoparticles and studies of nanostructural transformations within nanoparticles will be presented: (1) the magnetic field-directed self-assembly of magnetic nanoparticles into chains in three dimensions, (2) the nanoscale alignment of gold nanorods within macroscale-aligned electrospun polymer nano/microfibers, (3) the process of void formation through the Kirkendall effect, when nickel nanoparticles are converted into nickel oxide or nickel phosphide, (4) the sinter-free conversion of arrays of alloy FePt nanoparticles into intermetallic phases with analysis by scanning transmission electron microscopy, and (5) a new synthetic approach for controlling the size of thiolate-stabilized gold nanoparticles that alters the magic sizes

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