Single-wall carbon nanotubes capacities

Zambano, A.J., Talapatra, S., and Migone, A.D. (2001). Binding energy and monolayer capacity of Xe adsorbed on single-wall carbon nanotubes. Phys. Rev. B, 64, 075415 1-6. 

The amount of hydrogen that can be stored on these tubes has been debated. One report shows that maximum storage capacity for a single-walled carbon nanotube (SWCNT) [7] and multiwalled carbon nanotubes [8] is approximately 8% by weight [9], Multiwalled carbon nanotubes are a collection of concentric single-walled nanotubes [10] versus the one-dimensional single-walled tubes [11], SWCNTs have very high surface-to-volume ratios as well as uniform pores, which allow for capillary action and thus the ability to be filled by condensation. 

Hydroxyapatite (CajQ(P04)g(0H)2) has also attracted considerable interest as a catalyst support. In these materials, wherein Ca sites are surrounded by P04 tetrahedra, the introduction of transition metal cations such as Pd into the apatite framework can generate stable monomeric phosphate complexes that are efficient for aerobic selox catalysis [99]. Carbon-derived supports have also been utihzed for this chemistry, and are particularly interesting because of the ease of precious metal recovery from spent catalysts simply by combustion of the support. Carbon nanotubes (CNTs) have received considerable attention in this latter regard because of their superior gas adsorption capacity. Palladium nanoparticles anchored on multiwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) show better selectivity and activity for aerobic selox of benzyl and cinnamyl alcohols [100, 101] compared to activated carbon. Interestingly, Pd supported on MWCNTs showed higher selectivity toward benzaldehyde, whereas activated carbon was found to be a better support in cinnamyl alcohol oxidation. Functionalized polyethylene glycol (PEG) has also been employed successfully as a water-soluble, low-cost, recoverable, non-toxic, and non-volatile support with which to anchor nanoparticulate Pd for selox catalysis of benzyl/cinnamyl alcohols and 2-octanol [102-104]. 

Moreover, single-wall carbon nanotubes can act as quantum wires (Tans et al., 1997). As electrical devices and their associated power lines get smaller, the lines must carry higher current densities that are predicted to approach the maximum achievable by metal wires. A possible solution might be carbon nanotube-copper composites that have the potential of offering the same conductivity as copper but with 100 times the current carrying capacity (Subramaniam et al., 2013). 

GNS are produced by layer-by-layer exfoliation of graphite into oxidised graphene sheets (OGS) followed by a reduction. The thickness of nanoplatelets comprising a stacked assembly of 10 20 layers of GNS lies between 3 and 7 nm (Figure 7.62a). The nanocomposite of (i) GNS and CNT, and (ii) GNS and were prepared by reaction with the addition of single-walled carbon nanotubes and Cgo to GNS, respectively. The first cycle capacity of the reaction sequence samples—graphite, GNS, GNS + CNT and GNS + —are 360, 540, 730 and... 

---