二元固－液相图（一个物理化学综合实验）

二元固－液相图（一个物理化学综合实验）董习靖，张瑞玲，张凤才（天津大学化学系３０００７２）萘－对二氯苯是具有较低共熔点的系统，采用此系统进行二元固－液相图实验，具有以下优点：（１）样品较稳定，重现性好。（２）实验装置较为简单。（３）由于采用透明玻璃试...     

高温高压下水与非极性流体间的界面张力

The pendent drop or standing bubble method is applied to measure the interfacial tensions between water and nonpolar fluids (n-hexane, n-heptane, nitrogen, oxygen and methane) up to 473K and 220MPa. The high pressure autoclave with t wo visual windows and the auxiliary equipment are described. The sizes(ca 2mm) and shapes of drops or bubbles are recorded with microscope and video camera. The use of digital image permits fast, precise determination of the contour parameters. The densit y values of the liquids or gases have been chosen from literature. A special program is proposed to calculate the interfacial tensions automatically from drop shape at given temperature and pressure. The interfacial tensions σ12 increase with pr essure for the two liquid-liquid systems, but decrease with pressure for the three gas-liquid systems.