The micellation behaviour of mixtures of sodium lauryl sulphate (SLS) and octylphenol ethoxylate-10 (OPE-10) was investigated using tensiometry and dye solubilisation. The interaction parameters for the system were determined using Rubingh’s model for non-ideality and the adsorption parameters were calculated. The surfactant mixture was found to behave synergistically in terms of CMC reduction and dye solubilisation. Furthermore, the mixture appears to mimic the adsorption and micellation properties of OPE-10 more closely than SLS, regardless of composition. With this knowledge, and considering that OPE-10 is typically more expensive than SLS, the formulator can now use only a fraction of the required amount of OPE-10 for a given application (instead of using 100% OPE-10), resulting in high performance yet economical products. It was also found that the said mixture exhibits azeotropic behaviour at a certain fixed composition.

中文翻译：

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SLS-OPE-10 二元混合物在其 CMC 上的协同行为

使用张力测定法和染料溶解法研究了月桂基硫酸钠 (SLS) 和辛基酚乙氧基化物 10 (OPE-10) 混合物的胶束行为。系统的相互作用参数使用鲁宾格非理想模型确定，并计算吸附参数。发现表面活性剂混合物在 CMC 还原和染料溶解方面具有协同作用。此外，无论组成如何，该混合物似乎都比 SLS 更接近地模拟了 OPE-10 的吸附和胶束特性。有了这些知识，并且考虑到 OPE-10 通常比 SLS 更昂贵，配方设计师现在可以只使用给定应用所需 OPE-10 量的一小部分（而不是使用 100% OPE-10），从而导致高性能但经济的产品。