Nanotube characteristics

Two weak signals related to the nitro group were observed at 1538 and 1340 cm-i for ox-N-MWCNTs. Similar spectra have been reported for oxidized multiwall carbon nanotubes characteristic poaks were assigned to carboxylic, carbonyl, and hydroxyl group (Wang et al., 2007). These results have probe that sp>ectra carefully acquired by FTIR-ATR are a useful tool for identification of chemical group attached to surface of carbon nanotubes chemically modified. 

Once one layer has formed (the primary nanotube core), further secondary layers appear to deposit with various degrees of epitaxial coherence. When inhomogeneous deposition occurs in PCNTs, the thickening has a characteristic spindle shape, which may be a consequence of non-carbon impurities which impede graphitization (see below) —this is not the case for ACNTs were growth takes place in an essentially allcarbon atmosphere, except, of course, for the rare gas. These spindles probably include the appropriate num-... 

Table 2. Computed characteristics of a five-sheet symmetric tubule with a nearly constant pitch angle Table 4. Group characteristics of the 28-sheet described in Table 3 nanotube...

If the template effect of Endo and Kroto[9] does indeed exist and the growth of the tubule occurs outwards, a knowledge of the characteristics of the innermost tube is then of paramount importance in any attempt at modelizing the structure of a symmetric nanotube[ll]. By reversing eqn (17), possible values for Px and Qx can be obtained from... 

In this paper we elaborate models of perfect tubule connections leading to curved nanotubes, tori or coils using the heptagon-pentagon construction of Dunlap[ 12,13]. In order to understand the mechanisms of formation of perfectly graphitized multilayered nanotubes, models of concentric tubules at distances close to the characteristic graphite distance and with various types of knee were built. (Hereafter, for the sake of clarity, tubules will be reserved to the individual concentric layers in a multilayered nanotube.)... 

The nanotube connections whose diameter differences are different from the 3.8% value characteristic to the (9 ,0)-(5n,5 i) series, will tend to that value with increasing the graphite layer order n. 

Graphitizable coiled carbon nanotubes Table 1, Characteristics of some knees with minimal diameter difference... 

Carbon nanotubes (CNTs) as well as fullerenes are splendid gift brought to the Earth from the red giant carbon stars in the long-distant universe through the spectroscopy. Moreover, those belong to new carbon allotropes of the mesoscopic scale with well-defined structures. In particular, CNTs are considered to be the materials appropriate to realise intriguing characteristics related to the mesoscopic system based on their size and physicochemical properties. 

Rothen-Rutishauser, B. et al. (2010) Relating the physicochemical characteristics and dispersion of multiwalled carbon nanotubes in different suspension media to their... 

Preparation of carbon nanotube electrodes and their electrochemical characteristics... 

Amide bond is an effective anchor to connect CNTs to substrate surfaces. Lan et al. [52] covalently assembled shortened multi-walled carbon nanotubes (s-MWNT) on polyelectrolyte films. The shortened MWNT is functionalized with acyl chloride in thionyl chloride (SOCl2) before self-assembling. The FTIR spectrum of self-assem-bled MWNT (SA-MWNT) adsorbed on a CaF2 plate modified with PEI/(PSS/PEI)2 shows two characteristic absorption peaks at 1646cm-1 (amide I bond) and 1524cm-1 (amide II bond) resulting from the amide bond formed between the polyelectrolyte films and s-MWNTs. 

CNT-doped conducting polymers possess improved mechanical, chemical, and optical properties. They also provide a simple strategy for making aligned CNTs. The disappearance of the characteristic peaks of carbon nanotubes in the FTIR spectrum of polymer/CNT composite films is normally an indication of perfect enwrapping of CNTs with the deposited conducting polymer [162, 163], Zhang et al. [40] have studied the... 

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