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首页> 外文期刊>RSC Advances >Synergism between non-ionic and cationic surfactants in a concentration range of mixed monolayers at an air–water interface
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Synergism between non-ionic and cationic surfactants in a concentration range of mixed monolayers at an air–water interface

机译：非离子和阳离子表面活性剂在空气-水界面的混合单层浓度范围内的协同作用

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The surface properties and adsorption behavior of mixed binary surfactants containing alkylpyridinium chloride (CnPC, n = 14 and 16) and Triton X-100 (TX100) have been studied at 298.15 K. The values of the molecular interaction parameter (βs) and the mole fraction of components (Xsi) at the air–water interface in the pre-micellar region were calculated on the basis of Rosen's model. In the new approach, we proposed to estimate surface parameters (βs, Xsi, Γtot, Atot, ΓTX100 and ΓCnPC) in a pre-micellar region, using different fixed values of the surface tension instead of a single-value of surface tension. Then, the influence of surface tension on the surface properties was investigated. The interaction parameter (βs) is negative at all compositions showing a synergistic effect between the components. The βs was found to considerably decrease (less negative values) with decreasing surface tension due to more migration of TX100 to the surface layer and a reduction in electrostatic self-repulsion between head groups in the ionic surfactant. Also, the total surface area (Atot) at the air–water interface decreases with increasing Xs1 (mole fraction of TX100 in mixed monolayer) or decreasing surface tension due to the dilution effect on mixing.
机译：含烷基吡啶鎓氯化物（C n PC， n = 14和16）和Triton X-100（TX100）在298.15 K下进行了研究。分子相互作用参数（β s ）的值是成分的摩尔分数（ X s i ）在胶束前区的空气-水界面处，基于Rosen模型进行了计算。在新方法中，我们建议估计表面参数（β s ， X s i ，Γ tot ， A tot ，Γ TX100 < / small>和Γ C n PC ）在胶束前区域中，使用不同的表面张力固定值代替单个表面张力值。然后，研究了表面张力对表面性能的影响。相互作用参数（β s ）在所有组合物中均为负值，表明各组分之间具有协同效应。发现β s 随着TX100向表面层的更多迁移和表面张力的降低而随着表面张力的降低而显着降低（负值较小）。降低离子表面活性剂中头基之间的静电自排斥。此外，气-水界面处的总表面积（ A tot ）随着 X s 1 （混合单层中TX100的摩尔分数）或由于稀释对混合的影响而降低了表面张力。

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