부산대학교 도서관

Using the nanosized porous medium SBA-15, we construct the condensed spin-1 network composed of oxygen molecules (O 2) with tube and rod structures. The condensed network can be controlled by changing the amount of O 2 molecules and substituting nonmagnetic nitrogen molecules (N 2) at the O 2 site. The characteristics of the two-dimensional spin model were observed in the monolayer and double layer physisorption systems. In a typical bulk system, the liquidizing temperature T liq − gas is 90 K, while in SBA-15 with a pore size of 8.5 nm, the monolayer network of O 2 has a T liq − gas value of 60 K. However, in the monolayer system, when a half of O 2 site is diluted with N 2 , T liq − gas increases to 94 K. Even after the N 2 molecules are vaporized, they affect the physisorption potential of the inner wall of SBA-15. The resultant electric cloud of N 2 hinders the evaporation of O 2 , resulting in an increase in T liq − gas . The effect is weakened with increasing number of physisorption layers. Thus, this study presents the unique condensation phenomenon of two molecules with different T liq − gas under a strong physisorption potential. [ABSTRACT FROM AUTHOR]