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Cluster Origin of the Transfer Phenomena of Single-Wall Carbon Nanotubes

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Abstract:

It is discussed the existence of single-wall carbon nanotubes (SWNTs) in organic solvents in the form of clusters. A theory is developed based on a bundlet model, which enables describing the cluster-size distribution function. Comparison of calculated solubilities with experiments would permit obtaining energetic parameters characterizing the interaction of an SWNT with its surrounding. Fullerenes and SWNTs are objects whose behaviour in many physical situations is characterized by peculiarities, which show up in that these systems represent the only soluble forms of carbon, what is related to their molecular structures. The fullerene molecule is a virtually uniform closed spherical-spheroidal surface, and an SWNT is a smooth cylindrical unit. Both structures give rise to weak interactions between the neighbouring units in a crystal and promote their interaction with solvent molecules. Another peculiarity is related to their trend to form clusters consisting of a number of fullerene molecules or SWNTs. The interaction energy of a fullerene molecule or SWNT with solvent molecules is proportional to the surface of the former and roughly independent of the orientation of the latter. The phenomena have a unified explanation in the bundlet model, in which the free energy of an SWNT in a cluster is combined from two components, viz a volume one proportional to the number of molecules n in a cluster, and a surface one, proportional to n1/2. The membranous character of growth process in clusters allows explaining the dispersion of data. Growth mechanisms of fractal clusters in fullerene solutions are analyzed along with similarity laws determining the thermodynamic characteristics of fullerite crystals.

Keywords: BUNDLET CLUSTER MODEL; CARBON NANOTUBE SOLUBILITY; DROPLET CLUSTER MODEL; FULLERENE; FULLERITE; NANOHORN; NANOTUBE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jctn.2007.020

Publication date: May 1, 2007

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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