Surface tension of liquid fluorocompounds
Surface tension of liquid fluorocompounds
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DOI：
10.1021/je060199g
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发表时间：
2006-09-14
期刊：
影响因子：
--
通讯作者：
Coutinho, Joao A. P.
中科院分区：
文献类型：
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作者：
Freire, Mara G.;Carvalho, Pedro J.;Coutinho, Joao A. P.
本工作的目的是研究一些线性，环状，芳香族和α-取代的全氟化碳的表面张力。尽管它的根本利益，有关这些化合物的这种性质的信息是稀缺的，现有的数据是旧的，并提出强烈的差异。测量温度范围为（283~327）K，采用杜努伊环法。实验数据的分析表明，分子结构是一个重要的因素，在所研究的化合物的表面行为，因为芳香族氟化合物呈现最高的表面张力，其次是环状和取代的氟化合物。直链正全氟烷烃表现出最低的表面张力值，略有增加的碳数。表面热力学函数，如表面熵和焓来自表面张力值，并报告。实验数据进行了比较Faizullin相关性，它表明，该相关性描述了测量的表面张力的偏差小于4%。
This work aims at studying the surface tension of some linear, cyclic, aromatic, and alpha-substituted perfluorocarbons. Despite its fundamental interest, information about this property for these compounds is scarce, and the available data are old and present strong discrepancies among each other. The measurements were carried out in the temperature range (283 to 327) K with the Du Nouy ring method. The analysis of the experimental data shows that the molecular structure is an important factor in the surface behavior of the studied compounds since the aromatic fluorocompounds present the highest surface tensions, followed by the cyclic and substituted fluorocompounds. The linear n-perfluoroalkanes exhibit the lowest surface tension values, slightly increasing with the carbon number. The surface thermodynamic functions such as surface entropy and enthalpy were derived from surface tension values and are also reported. The experimental data were compared against the Faizullin correlation, and it is shown that this correlation describes the measured surface tensions with deviations inferior to 4 %.