Asymmetric criticality of the osmotic compressibility in binary mixtures

作者：Yin, Tianxiang; Liu, Shixia; Xie, Jingjing; Shen, Weiguo^*

来源：Journal of Chemical Physics, 2013, 138(2): 024504.

DOI：10.1063/1.4770750

• LIQUID COEXISTENCE CURVES
• HEAT-CAPACITY
• CRITICAL-BEHAVIOR
• LIGHT-SCATTERING
• CRITICAL-POINT
• ETHYLAMMONIUM NITRATE
• PHASE
• OPALESCENCE
• TURBIDITY
• ALKANES

Heat capacities in the critical and the non-critical regions for {benzonitrile + tridecane} and {benzonitrile + pentadecane}, and light scattering for {benzonitrile + undecane}, {benzonitrile + dodecane}, {benzonitrile + tridecane}, {benzonitrile + tetradecane}, {benzonitrile + pentadecane}, and {benzonitrile + hexadecane} in the critical two-phase region were measured. Light scattering measurements confirmed the existence of the asymmetry for the osmotic compressibility while no such asymmetry was observed for the correlation length. An analysis of the osmotic compressibility asymmetry suggested the dominance of the singular term vertical bar Delta(T) over cap vertical bar(beta), which supports the complete scaling theory. The consistency of the complete scaling theory in descriptions of different asymmetry behaviors was also discussed. Moreover, it was found that the contribution of the heat capacity-related term is also important in describing the asymmetry of the osmotic compressibility as it was observed in studies of the diameters of the coexistence curves.

• 出版日期2013-1-14
• 单位华东理工大学; 兰州大学