Treatment of Carbon Nanotubes

Surface Treatment of Carbon Nanotube and Other Nanoadditives.272... 

Jang, J. Bae, J. Yoon, S.H. A stndy on the effect of surface treatment of carbon nanotubes for liquid crystalline epoxide-carbon nanotube composites. J. Mater. Chem. 2003, 13, 676-681. 

Bose S, Khare RA, Moldenaers P. Assessing the strengths and weaknesses of various types of pre-treatments of carbon nanotubes on the properties of polymer/carbon nanotubes composites A critical review. Polymer 2010 51(5) 975-993. 

In Fig. 1 is shown a HRTEM image of part of the end of a PCNT. The initial material consisted of carbon nanotubes upon which bi-conical spindle-like secondary growth had deposited[21], apparently by inhomogeneous deposition of aromatic carbonaceous, presumably disordered, layers on the primary substrate nanotube. Prior to further heat treatment, the second-... 

Purification, Opening, and Size Reduction of Carbon Nanotubes by Oxidative Treatments... 

An important route to solubilization of carbon nanotubes is to functionalize their surface to form groups that are more soluble in the desired solvent environment. It has been shown that acid treatment of nanotube bundles, particularly with HC1 or HNO3 at elevated temperatures, opens up the aggregate structure, reduces nanotube length, and facilitates dispersion (An et al., 2004 Kordas et al., 2006). Nitric acid treatment oxidizes the nanotubes at the defect sites of the outer graphene sheet, especially at the open ends (Hirsch, 2002 Alvaro et al., 2004), and creates carbonyl, carboxyl, and hydroxyl groups, which aid in their solubility in polar solvents. 

Liu, Y. and Gao, L., A study of the electrical properties of carbon nanotube-NiFe204 composites effect of the surface treatment of the carbon nanotubes , Carbon, 2005, 43, 47-52. 

New Method of Purification of Carbon Nanotubes Based on Hydrogen Treatment... 

Various oxidative processes used for the purification of carbon nanotubes such as refluxing in acid, sonication in sulfuric and nitric acid (3 1) solution, and treatment with... 

Collins, P.G., Bradley, K., Ishigami, M., and Zettl, A. (2000). Extreme oxygen sensitivity of electronic properties of carbon nanotubes. Science, 287, 1801—4. Ohba, T., Omori, T., Kanoh, H., et al. (2004). Intentitial nanopore change of single wall carbon nanohom assembUes with high temperature treatment. Chem. Phys. Lett., 389, 332-6. 

In analogy to the chemistry of fullerenes, the reaction of carbon nanotubes with boranes could be assumed to provide hydroborated products that might be converted into a number of derivatives, for example, into partially hydrogenated structures by treatment with carbonic acids. It turned out, however, that the reactivity of double bonds in nanotubes does not suffice for a hydroboration. According to calculations, the process should be thermodynamically neutral when performed on a typical SWNT, which means it is anything but a preferred reaction. 

Kwok, C.T. (2007) Fabrication of carbon nanotube reinforced hydroxyapatite coating on stainless steel 316L by laser surface treatment. 11th International Conference on Precision Engineering-Toward Synthesis of Micro/Nano Systems (11th ICPE), Tokyo, Japan, August 16-18, 2006, pp. 261-265. 

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