| Abstract: |
Single-wall carbon nanotube (SWCNT) dispersions are well suited to characterization through analytical ultracentrifugation (AUC) methods, with prior efforts determining the structure and density of adsorbed surfactant molecules, length distributions of the SWCNTs and the density of inserted confined molecules within the nanotube core. In this talk I will discuss the use of sedimentation velocity experiments, including isotopic density contrast measurements, in validating a mechanism of multi-surfactant competition for nanotube surface adsorption that governs selectivity in extraction conditions in large scale separations of different nanotube species. The AUC data resolves additional complexity in the collective exchange of the adsorbed surfactants with variation in solution concentrations beyond that observed in orthogonal fluorescence measurements while explaining observed trends within the data. |
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