Phase behaviour of argon and krypton adsorbed in mesoporous Vycor glass
Phase behaviour of argon and krypton adsorbed in mesoporous Vycor glass
复制标题
介孔 Vycor 玻璃中吸附的氩和氪的相行为
DOI：
10.1088/0953-8984/15/27/305
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
H. Fretwell
中科院分区：
文献类型：
--
作者：
D. G. Jones;H. Fretwell
研究了在高于体三相点和低于体临界点的压力和温度下，在Vycor玻璃中吸附Ar和Kr的相行为。在体转变以上~2 K处，Ar在孔隙中凝结，在体转变以下~10 K处凝固。相比之下，Kr的凝结跃迁向上移动了4 K，冻结跃迁向下移动了15 K。在液/固交界处有明显的滞后（4 ~ 6 K），而在气/液交界处有较小的滞后（~2 K）。我们发现气/液相边界的孔隙填充和排空过程之间存在明显差异，并且在解吸过程中存在孔隙阻塞的证据。此外，当Kr在孔隙中凝结时，被认为会出现微气泡或大的气液界面，但Ar没有这种影响。最后，孔隙中的固体Ar比Kr更连续地熔化。
The phase behaviour of Ar and Kr adsorbed in Vycor glass at pressures and temperatures above the bulk triple point and below the bulk critical point has been investigated. Ar is found to condense in the pores ~2 K above the bulk transition and freeze ~10 K below the bulk transition. In contrast the condensation transition for Kr is shifted up by 4 K and freezing shifted down by 15 K. There is a pronounced hysteresis (4–6 K) at the liquid/solid phase boundary and a lesser amount (~2 K) at the gas/liquid boundary. We find clear differences between the pore filling and emptying processes at the gas/liquid phase boundary and evidence of pore blocking on desorption. In addition microbubbles or large gas–liquid interfaces are thought to occur when Kr condenses in the pores but this effect is absent in Ar. Finally, solid Ar in the pores melts in a more continuous way than Kr.