WO2007066780-A1  NIKOLAEV P. ET AL: 'Diameter doubling of single-wall nanotubes' CHEMICAL PHYSICS LETTERS vol. 266, 1997, pages 422 - 426, XP003013687;  FANG S.L. ET AL: 'Raman scattering study of coalesced single walled carbon nanotubes' JOURNAL OF MATERIALS RESEARCH vol. 13, no. 9, 1998, pages 2405 - 2410, XP003013688;  YUDASAKA M. ET AL: 'Structure changes of single-wall carbon nanotubes and single-wall carbon nanohorns caused by heat treatment' CARBON vol. 41, no. 6, 2003, pages 1273 - 1280, XP003013686EP1958922-A1  U. J. KIM ET AL: "Effect of the Tube Diameter Distribution on the High-Temperature Structural Modification of Bundled Single-Walled Carbon Nanotubes", THE JOURNAL OF PHYSICAL CHEMISTRY B, vol. 109, no. 49, 19 November 2005 (2005-11-19), pages 23358-23365, XP055059851, ISSN: 1520-6106, DOI: 10.1021/jp0541009;  See also references of WO 2007066780A1US8029758-B2  Yudasaka, M.; Kataura, H. et al.; "Diameter Enlargement of HiPco Single-Wall Carbon Nanotubes by Heat Treatment", Nano Letters. vol. 9 No. 1, 487-489. (2001).;  C. Liu et al., "Hydrogen Storage in Single-Walled Carbon Nanotubes at Room Temperature," Science, vol. 286, No. 5442, pp. 1127-1129 (Nov. 5, 1999).;  M. Yudasaka et al., "Structure Changes of Single-Wall Carbon Nanotubes and Single-Wall Carbon Nanohorns Caused by Heat Treatment," Carbon, vol. 41, No. 6, pp. 1273-1280 (2003).;  P. Nikolaev et al., "Diameter Doubling of Single-Wall Nanotubes," Chemical Physics Letters, vol. 266, pp. 422-426 (1997).;  S. Fang et al., "Raman Scattering Study of Coalesced Single Walled Carbon Nanotubes," J. Mater. Res., vol. 13, No. 9, pp. 2405-2410 (1998).EP1958922-B1  U. J. KIM ET AL: "Effect of the Tube Diameter Distribution on the High-Temperature Structural Modification of Bundled Single-Walled Carbon Nanotubes", THE JOURNAL OF PHYSICAL CHEMISTRY B, vol. 109, no. 49, 19 November 2005 (2005-11-19), pages 23358-23365, XP055059851, ISSN: 1520-6106, DOI: 10.1021/jp0541009;  YUDASAKA M. ET AL: 'Structure changes of single-wall carbon nanotubes and single-wall carbon nanohorns caused by heat treatment' CARBON vol. 41, no. 6, 2003, pages 1273 - 1280, XP003013686;  NIKOLAEV P. ET AL: 'Diameter doubling of single-wall nanotubes' CHEMICAL PHYSICS LETTERS vol. 266, 1997, pages 422 - 426, XP003013687;  FANG S.L. ET AL: 'Raman scattering study of coalesced single walled carbon nanotubes' JOURNAL OF MATERIALS RESEARCH vol. 13, no. 9, 1998, pages 2405 - 2410, XP003013688