(128d) Necessity of Nanowindow Concept in Adsorption and Separation Science in Single Atomic Layer Materials

Single wall carbon nanotube (SWCNT), single wall carbon nanohorn (SWCNH), and stacked graphenes consist of single atomic layers. We can produce the nanoscale holes on the graphene wall of SWCNT or SWCNH to induce predominant adsorption of molecules or ions inside the single wall nanotubilite. The nanopores have been used for the holes even in the single layered materials. However, the concept of the pore is applied to the space whose depth is sufficiently deep compared with the molecular size. If we emphasize the role of the pore entrance, we must distinguish the pore entrance and the residual pore part, because the molecules adsorbed at the entrance cannot interact directly with the molecules in the pore. On the other hand, the molecule trapped in the hole interacts with molecules on both sides of the single graphene, being quite different from molecules in the pore. The most important function of the hole is opening or closing like a window, being completely different from pores where molecules are concentrated. Then, the usage of the nanowindow is recommended to use for adsorption and separation of molecules or ions on the hole of the single layer material.　The significant role of the nanowindow in the graphene experimentally and theoretically shown will be introduced.