Li Na, Zhang Shaohua, Zheng Liqiang, Gao Yan'an, Yu Li
Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
Langmuir. 2008 Apr 1;24(7):2973-6. doi: 10.1021/la703834z. Epub 2008 Mar 1.
The second virial coefficient of the ionic liquid (IL) microemulsion was obtained for the first time using microcalorimetry. The heat of dilution of the microemulsion solutions was measured by isothermal titration microcalorimetry (ITC), and the second virial coefficient was derived from the heat of dilution and the number density of the IL microemulsion solutions on the basis of a hard-sphere interaction potential assumption and as a function of the second-order polynomial. The validity of the second virial coefficient was confirmed by the percolation behavior of different ionic liquid microemulsion solutions of Triton X-100 in cyclohexane with or without added salts. The information obtained from the second virial coefficient shows that the interactions between ionic liquid microemulsion droplets are much stronger than those for traditional microemulsions, which may be attributed to the relatively larger size of the microemulsion droplets.
首次使用微量量热法获得了离子液体（IL）微乳液的第二维里系数。通过等温滴定量热法（ITC）测量微乳液溶液的稀释热，并基于硬球相互作用势假设，从稀释热和IL微乳液溶液的数密度出发，将第二维里系数推导为二阶多项式的函数。通过Triton X - 100在环己烷中添加或不添加盐的不同离子液体微乳液溶液的渗滤行为，证实了第二维里系数的有效性。从第二维里系数获得的信息表明，离子液体微乳液液滴之间的相互作用比传统微乳液的相互作用要强得多，这可能归因于微乳液液滴相对较大的尺寸。
