Effect of Packing on Cluster Solvation of Nanotubes

It is discussed the possibility of the existence of single-wall carbon nanotubes (SWNTs) in organic solvents in the form of clusters, containing a number of SWNTs. A theory is developed based on a bundlet model for clusters, which enables describing the distribution function of clusters by size. Comparison of the calculated values of solubility with experimental data would permit obtaining energetic parameters characterizing the interaction of an SWNT with its surrounding, in a solid phase or solution. Fullerenes—SWNTs are unique objects, whose behaviour in many physical situations is characterized by remarkable peculiarities. Peculiarities in solutions show up first in that fullerenes—SWNTs represent the only soluble forms of carbon. This fact is primary related to the originality in the molecular structure of fullerenes—SWNTs. The fullerene molecule is a virtually uniform closed spherical—spheroidal surface, having no sharp ridges or dents. An SWNT is a smooth cylindrical unit. Both structures give rise to the relatively weak interaction between the neighbouring molecules in a crystal and promote effective interaction of the molecules with those of a solvent. In solutions, they form clusters, consisting of a number of fullerene molecules—SWNTs. The energy of interaction of a fullerene molecule—SWNT with solvent molecules is proportional to the surface of the former molecule and roughly independent of the relative orientation of solvent molecules.