Aggregation kinetics of novel carbon nanotube and ruthenium metallodendrimer supramolecular assemblies

PHYS 452

Andrea Giordano, angiorda@uncc.edu, Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223 and Jordan C. Poler, jpoler@uncc.edu, Department of Chemistry and Center for Optoelectronics and Optical Communications, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223-0001.
Single Walled Carbon Nanotubes (SWCNTs) show effective binding with varying ruthenium complexes in N, N-Dimethylformamide (DMF). Enantiomerically pure ruthenium metallodendrimer [Ä6Ë3Ä-Ru10]20+[PF6-]20 (Ru(dec)) is shown to bind strongly and specifically to the SWNTs. Our studies show that varying concentrations of coagulants, stable dispersions of carbon nanotubes aggregate and flocculate. The critical coagulation concentrations (CCC) have been determined for +1, +2, and +3 inorganic salts, the +2 Ru(phen)3, and the +20 ruthenium coagulants. We studied the binding capacity and binding kinetics with UV-VIS spectroscopy, Atomic Absorption spectroscopy, dynamic light scattering and zeta-potential measurements. CCC of varying ruthenium oligomers as a function of morphology and charge state will be presented. Analysis of current theoretical models is given with regard to these experimental data. Multiparticle interactions and solvent affects will be discussed. Potential applications toward 3-dimensional nano-manufacturing will be discussed.
 

PHYS Poster Session - Nanostructured Materials and Nanophotonics
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008