Abstract Submitted to the    NANOTUBE'04 Conference:

The ultrasonicated dispersions of singlewall carbon nanotubes (SWNTs) in various solvents and aqueous surfactant emulsions were investigated to correlate the degree of dispersion states of SWNTs with Hansen’s solubility parameters (δt2= δd2+ δp2 + δh2). It was found that SWNTs were dispersed or suspended very well in the solvents with certain value of the dispersive component (δd). They were precipitated in the solvents with high polar component (δp) and hydrogen bonding component (δh). The solvents in dispersed group occupied a certain region in 3-dimensional space of three components. The surfactants with lipophilic group equal to and longer than decyl, containing 9 methylene groups and 1 methyl group, contributed to the dispersion of SWNTs in water. The surfactant in dispersed group had a lower limit in the dispersive component (δd) of Hansen parameter.