Specific ion effects on the interfacial tension of water/hydrocarbon systems
Specific ion effects on the interfacial tension of water/hydrocarbon systems
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DOI：
10.1590/s0104-66322013000100007
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发表时间：
2013-03-01
影响因子：
1.2
通讯作者：
Paredes, M. L. L.
中科院分区：
文献类型：
--
作者：
Lima, E. R. A.;Melo, B. M. de;Paredes, M. L. L.
特殊离子效应--也称为霍夫迈斯特效应--在化学、化学工程和生物学的多个领域中普遍存在。界面张力对应于界面上单位面积的能量。因此，不同浓度的不同盐的存在会改变含水相体系的界面张力。这种影响可以根据界面附近不同离子的浓度分布来解释。为了研究这种影响，我们测量了电解质水溶液的表面张力，以及含碳氢化合物和不同电解质水溶液的各种体系的界面张力随水相离子强度的变化。我们根据测试离子改变每个体系的界面张力的能力对其进行分类。这些数据提供了与相应乳液的稳定性相关的有价值的信息，因为增加界面张力的能力较高的离子往往更有效地破坏相应乳液的稳定。
Specific ion effects - also known as Hofmeister effects - are ubiquitous in several areas of chemistry, chemical engineering and biology. The interfacial tension corresponds to the energy per unit of area at the interface. Thus, the presence of different salts in different concentrations changes the interfacial tension of a system containing an aqueous phase. This effect can be explained based on the concentration profile of different ions in the vicinity of the interface. In order to study this effect we measured the surface tension of aqueous electrolyte solutions and the interfacial tension of various systems containing hydrocarbons and different aqueous electrolyte solutions as a function of the ionic strength of the aqueous phase. We classify the tested ions for their ability to alter the interfacial tension of each system. These data provide valuable information that can be related to the stability of the corresponding emulsions, since the ions with higher capability of increasing the interfacial tension tend to be more effective in destabilizing the corresponding emulsion.