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Citation: Tian Yi-Ling, Xiao Yan-Fan, Zhu Hong-Xu, Dong Xi-Jing, Ren Xiao-Wen, Zhang Feng-Cai. Interfacial Tensions between Water and Non-polar Fluids at High Pressures and High Temperatures[J]. Acta Physico-Chimica Sinica, ;1997, 13(01): 89-95. doi: 10.3866/PKU.WHXB19970120 shu

Interfacial Tensions between Water and Non-polar Fluids at High Pressures and High Temperatures

1.
Department of Chemistry,Tianjin University,Tianjin 300072

Received Date: 15 January 1996
Available Online: 15 January 1997

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.
- High pressure,
- High temperature,
- Interfacial tension,
- Methane,
- Heptane,
- Hexane,
- Oxygen,
- Nitrogen
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