Multi-walled carbon nanotubes SWCNTs

CVD may also be used as a simple, energy-efficient method to produce single- or multi-walled carbon nanotubes (SWCNTs and MWCNTs, respectively) with growth control, high yield, and purity. In this case, catalyst nanoparticles of transition metals (as Ni, Co, and Fe) are used as seeds." ... 

Recent work in in situ composites has included the incorporation of single and multi-wall carbon nanotubes (SWCNT and MWCNT). Notably, a low-cost alternative exists in the form of thermal chemical vapor deposition-grown carbon nanohbers (CNF) which are slightly inferior due to... 

Among the several known types of carbon fibres the discussion in this chapter is limited to the electric arc grown multi-walled carbon nanotubes (MWCNTs) as well as single-walled ones (SWCNTs). For MWCNT we restrict the discussion to the idealised coaxial cylinder model. For other models and other shapes we refer to the literature [1-6],... 

Figure 15.32 (a) Single walled carbon nanotube (SWCNT) with capped end (b) multi-walled carbon... 

CNTs consist of graphite sheets rolled into a cylinder. CNTs have diameters in the range of 1-10 nm. CNTs can be categorized into two types single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). SWCNTs can be thought of as a single... 

The effect of slowing down of electromagnetic waves in a multi-wall carbon nanotube (MWCNT) is considered. The possibility of significant decrease of the wave phase velocity in MWCNT as compared with a single-wall nanotube (SWCNT) is demonstrated. 

Carbon nanotubes (CNTs) are seamless cylindrical graphitic nanofibers made of sp carbon atoms. A carbon nanotube may consist of a single graphitic sheet [single-walled carbon nanotubes (SWCNTs) [8] as shown in Figure 14.2(c)] or multiple concentric graphitic sheets [multi walled carbon nano tubes (MWCNTs)... 

PPy has also been used in combination with CNTs to obtain an anticorrosion coating. Hermas [69] studied PPy-CNTs coating applied on stainless steel by in situ EP of PPy-oxidised multi-walled carbon nanotubes (MWCNTs) and PPy-oxidised SWCNTs composites from 0.1 M oxalic acid by using cyclic voltammetry. The results show that the addition of the oxidised carbon nanotubes greatly enhances the EP process, especially in the case of oxidised SWCNTs. Similar results are reported in Ref. [70], referring to electrodeposition of a nanocomposite coating made of oxidised CNTs and poly(o-phenylenediamine) (PoPD) on a stainless steel. Also in this case the presence of the CNTs enhances the deposition of the PoPD and this enhancement is more evident with SWCNT than with MWCNTs. The nanocomposite coating keeps the stainless steel in a passive state in an acidic solution. 

Sanchez studied the functionalization of oxidized SWCNTs and MWCNTs dispersed in thermoplastic elastomers based on poly(butylene terephthalate) (PBT)/ poly(tetramethylene oxide) (PTMO). These nanocomposites showed good dispersion and enhancement in thermo-oxidative stability [27]. 1 % of pristine multi-walled carbon nanotube (MWCNTs) were dispersed in silicon rubber. The SR nanocomposites showed 28 % better thermal stability and 100 % improvement in the ultimate tensile strength is achieved as compared with the pristine polymer matrix counterpart [28]. Also ionic liquids have been tested to improve the dispersion and thermal stability of MWCNTs in polychloroprene rubber (CR) showing improvement in these properties [29]. On the other hand the effect of carbon nanofiber on nitrile rubber was studied. It has been found that the nanofiber increase the thermal stability and decrease the flammability [4]. 

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