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

Joseph Tracy
North Carolina State University
Monday, March 12, 2012
NCSU, Room 1011 EB1 | 10:40am

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.