By M. Endo, S. Iijima, M.S. Dresselhaus
Carbon nanotubes were studied largely on the subject of fullerenes, and including fullerenes have opened a brand new technological know-how and expertise box on nano scale fabrics. an entire variety of matters from the practise, constitution, houses and remark of quantum results in carbon nanotubes compared to 0-D fullerenes are mentioned. furthermore, complementary experiences on carbon nanoparticles comparable to carbon nano-capsules, onion-like graphite debris and metal-coated fullerenes are coated. This ebook goals to hide contemporary learn and improvement during this sector, and so offer a handy reference instrument for all researchers during this box. it's also was hoping that this publication can serve to stimulate destiny paintings on carbon nanotubes.
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Extra resources for Carbon Nanotubes
09 n n 3n n 6 5 5 L/a 475 9 m J93 m 10 m 6175 6525 m &a/n na/T fin n Table 3. Character table for group D(u+l, ... AI 1 '42 E, E, 1 2 2 1 ... 1 1 1 1 1 ... 2 ~ 0 ~ 2 6~ ~0 ~ 2. 6. 2~c o ~ j 6 ~ 2 c 0 s 2 + ~ 2 ~ 0 ~ 4. 4. 2~c 0 s 2 j + ~ E, 2 2c0sjbj . where 2C;j = 27/(2j 2C:; 2Ci, 2cos2j6, . . 2cos j2c+5j + 1) and j is an integer $/2n 1 10 18 182 62 194 20 12 70 70 210 1/10 1/18 149/ 182 11/62 71/194 1/20 1/12 1/14 3/70 1/42 2n 2n 1/2n 1/2n fi m m m 43 1 m d7 621 1 + E N A are given in Table 3 (for odd n = 2 j 1) and in Table 4 (for even n = 2 j ) , wherej is an integer.
For 1D systems on a cylindrical surface, translational symmetry with a screw axis could affect the electronic structure and related properties. The exotic electronic properties of 1D carbon nanotubes are seen to arise predominately from intralayer interactions, rather than from interlayer interactions between multilayers within a single carbon nanotube or between two different nanotubes. Since the symmetry of a single nanotube is essential for understanding the basic physics of carbon nanotubes, most of this article focuses on the symmetry properties of single layer nanotubes, with a brief discussion also provided for two-layer nanotubes and an ordered array of similar nanotubes.
For better purification, the tubule-containing catalyst was treated by H F (40%) over 72 hours. The resulting extract was purer than that obtained after US treatment. The addition of nitric acid also makes it possible to free the tubules of metal particles on the external surface. The conditions of the acid treatment and tubule extraction have yet to be optimized. 4. CONCLUSIONS In this study we have shown that the catalytic method-carbon deposition during hydrocarbons conversion-can be widely used for nanotubule production methods.