From tensiometric measurements, critical micelle concentration (CMC), maximum surface excess concentration, minimum area per molecule at the air-liquid interface and thermodynamic parameters of micellization have been determined for an anionic surfactant: bis-(2-ethylhexyl) sodium sulfosuccinate (AOT) in aqueous medium. Effects on the above physico-chemical properties due to added electrolytes: Na₂SO₄ and Na₃PO₄ over a wide range of the surfactant concentrations and at 288.15, 293.15 and 298.15 K have been described in the light of intermolecular interactions. The CMC of AOT is lowered and the micellar stability is improved upon mixing the above electrolytes in aqueous surfactant solution and the same become more pronounced when divalent SO₄^2- are replaced by trivalent PO₄^3-. These observations may be beneficial for improving efficiency of AOT as a detergent, managing oil spill problem, in froth-flotation process for concentrating ores and for efficient recovery of petroleum in the tertiary process.

中文翻译：

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Na2SO4和Na3PO4对阴离子表面活性剂的表面和热力学性质的影响：双（2-乙基己基）磺基琥珀酸钠（AOT）的水溶液

通过张力测量，已确定了阴离子表面活性剂双-（2-乙基己基）磺基琥珀酸钠（AOT）的临界胶束浓度（CMC），最大表面过量浓度，气-液界面上每个分子的最小面积和胶束化的热力学参数。 ）在水性介质中。添加电解质：Na ₂ SO ₄和Na ₃ PO ₄对上述物理化学性质的影响鉴于分子间的相互作用，已经描述了在宽范围的表面活性剂浓度和288.15、293.15和298.15 K下的表面活性剂。在表面活性剂水溶液中混合上述电解质后，AOT的CMC降低，胶束稳定性得到改善，当二价SO ₄ ^2-被三价PO ₄ ^3-取代时，其变得更加明显。这些观察结果可能有益于提高AOT作为清洁剂的效率，管理溢油问题，在用于浓缩矿石的泡沫浮选过程中以及在第三过程中有效回收石油。