Pore structures of multi-walled carbon nanotubes activated by air, CO2 and KOH

Synthesis and evaluation of carbon nanotubes composite adsorbent for CO2 capture: a comparative study of CO2 adsorption capacity of single-walled and multi-walled carbon nanotubes

“…The values are consistent with literature (Wu et al 2007). The CNTs used in this study were all mesoporous materials because they all have average pore sizes between 2 and 50 nm (Chen et al 2006). Pore size is an important characteristic of an adsorbent because different gases possess different molecular sizes based on the intramolecular forces and the bond strength within the gas molecule.…”

Influence of the pore size in multi-walled carbon nanotubes on the hydrogen storage behaviors

“…Partial gasification with an oxidizing gas, such as carbon dioxide or steam, is the most common way of introducing pores in bulk carbon materials [19][20][21][22][23]. Different methods such as cutting [24], cap-opening [25], and chemical treatment [26][27][28] have been used to increase the specific surface area of CNTs and other carbon materials. One method which involves the activation of CNTs with chemical activating agents, such as KOH and NaOH, leads to an outstanding increase in specific surface area as well as the formation of an abundant network of micropores and mesopores.…”

“…The choice of chemical agent may determine the pore size. For example, the activation of CNTs with KOH forms a preponderance of micropores [18,19,28].…”

Percolation thresholds for discrete-continuous models with nonuniform probabilities of bond formation

“…In cases when the structures are neither 1D nor quasi-1D (fullerenes [18,19]), stacked graphite [20], or graphene [15], carbon onions [21]), the concrete models considered here provide only a "caricature" of the real situation, capturing only qualitative aspects of the underlying physics.…”

“…Most proposed models are based on carbon nanotubes [10,11,16,17], but various other forms of carbon potentially building such micro-structures were also considered, including graphene ribbons (Jenkins-Kawamura model), fullerenes (Harris model [18,19]), stacked graphite [20] or graphene [15], carbon onions [21]. More concretely, we assume that the skeleton walls are made of a collection of parallel tubes representing nanopipes of varying lengths.…”