H2adsorption on multiwalled carbon nanotubes at low temperatures and low pressures

Abstract

We present an experimental study on H 2 adsorption on multiwalled carbon nanotubes (MWCNTs) at low temperatures (12-30 K) and low pressures (2 Â 10 À5 Torr) using the temperature programmed desorption technique. Our results show that the molecular hydrogen uptake increases nearly exponentially from 6 Â 10 À9 wt: % at 24.5 K to 2 Â 10 À7 wt: % at 12.5 K and that the desorption kinetics is of the first order. Comparative measurements indicate that MWCNTs have an adsorption capacity about two orders higher than that of activated carbon (charcoal) making them a possible candidate as hydrogen cryosorber for eventual applications in accelerators and synchrotrons.

CO2 adsorption on silver nanoparticle/carbon nanotube nanocomposites: A study of adsorption characteristics

“…Finally, we can note that the adsorption behavior of CO 2 is identical to other gases. As discussed in Section 1, several theoretical and experimental works report that CO 2 does not adsorb on graphite below 104 K and that above this temperature only one layer is stable and they observe the formation of 3D clusters . As discussed in the Introduction, one of the open questions in the study of CO 2 adsorption in carbon‐based materials is the influence of nonwetting behavior of CO 2 C on the adsorption properties.…”

“…. The dimensions of nanoparticles were controlled by changing the laser ablation parameters and monitored by measuring the optical adsorption of the colloidal solution and taking AFM images . We irradiated the silver plates for 50 s, with the first harmonic (1064 nm) of a pulsed laser YAG, with an energy of about 500 mJ/pulse and pulse of 7 ns.…”

“…Finally, the obtained solution was deposited on a hot substrate by methods described in Refs. , to obtain a perfect integration of the two materials and the complete evaporation of solvents.…”