Phase Behaviors of Quantum Fluids in Pores - Modeling of Condensation and Solidification Behaviors

在16-127K的温度范围内，用吸附等温线测量了中孔中的凝聚物(Ne、Ar和Kr)。我们使用了孔表面均匀覆盖有少量碳层的介孔二氧化硅SBA-15(C/SBA-15，孔宽：5.5 nm)。用实验吸附数据建立了Ne、Ar和Kr在C/SBA-15中受限的压力-温度(P-T)相图。约束Ar的P-T相图与约束Kr的P-T相图符合得很好，说明受限经典流体遵循对应态原理。另一方面，受限Ne的折合P-T相图与经典受限流体的P-T相图不一致，显示出比经典流体更高的凝固点，表明它不遵循对应态原理。这表明，即使对于受限的Ne，量子效应也不能被忽略。

Condensates (Ne, Ar and Kr) in mesopores have been investigated by adsorption isotherm measurements over the range of temperatures from 16-127 K. We have used mesoporous silica SBA-15 of which the pore surface is uniformly covered with a few carbon layers for the experiments (C/SBA-15, pore width: 5.5 nm). The pressure-temperature (P-T) phase diagrams of the confined Ne, Ar and Kr in C/SBA-15 have been established with the experimental adsorption data. The P-T phase diagram of confined Ar, which is reduced by the critical pressure and temperature of the bulk fluid, is in good agreement with that of confined Kr, suggesting that the confined classical fluids obey the principle of corresponding states. On the other hand, the reduced P-T phase diagram of confined Ne does not coincide with those of the classical confined fluids, and shows higher freezing point than the classical fluids, indicating that it does not follow the principle of corresponding states. This suggests that quantum effects can not be neglected even for confined Ne.