Controlled packing of nanoparticles: From magnetic materials to superhydrophobic surfaces

COLL 15

Bappaditya Samanta, bsamanta@chem.umass.edu1, Yuval Ofir, yofir@chem.umass.edu2, and Apiwat Chompoosor, achompoo@chem.umass.edu2. (1) Department of Chemistry, University of Massachusetts at Amherst, 710 North Pleasant Street, Amherst, MA 01003, (2) Department of Chemistry, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003
Self-assembly of nanoparticles into higher order architectures is an appealing route to hierarchical materials with potential in magnetic, electronic and optoelectronic applications. FePt nanoparticles are attractive materials for magnetic applications due to their large uniaxial magnetocrystalline anisotropy. We have used place exchange reactions to modify the FePt nanoparticles ligand with varying amount of fluorinated and non-fluorinated ligands, which in turn allowed control over nanoparticles packing. Films of these NPs show tuneable surface morphology ranging from amorphous to highly crystalline structure. The morphology and degree of fluorination also show a dramatic effect on the surfaces wettability going from adhesive and hydrophobic to water repulsive and superhydrophobic (165°). Finally, the magnetic property of these materials is strongly dependent upon the morphology of the assemblies.
 

Chemically and Topographically Textured Surfaces
8:30 AM-12:00 PM, Sunday, August 19, 2007 BCEC -- 153A, Oral

Division of Colloid & Surface Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007