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Synergistic adsorption of Triton X-100 and CTAB surfactants at the toluene+water interface

机译:Triton X-100和CTAB表面活性剂在甲苯+水界面上的协同吸附

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摘要

Equilibrium interfacial tension measurements at 25.0°C of the toluene+water system with two widely used surfactants, octylphenol decaethylene glycol ether (Triton X-100) and cetyl trimethyl ammonium bromide (CTAB) having concentrations much lower than their CMC were performed. According to the obtained parameters from the Szyszkowski equation, Triton has higher adsorption tendency than of CTAB. The results obtained for surfactants mixtures are analyzed by the theory of non-ideal interactions in binary mixtures (NIBMs) and the interfacial composition and the interaction parameter in the mixed adsorbed monolayer are determined. The attractive interaction shows a maximum value at nearly equal surfactants bulk mole fraction. The synergism is achieved for Triton bulk mole fractions of 0.30 and higher, and the highest degree of synergism (40.6%) is found for the bulk mole fraction of 0.52 with the lowest investigated constant interfacial tension of 28.0mNm~(-1). A correlation was developed for variation of the interaction parameter with bulk mole fraction.
机译:使用两种广泛使用的表面活性剂,辛基苯酚十甘醇醚(Triton X-100)和十六烷基三甲基溴化铵(CTAB),在其浓度低于其CMC的条件下,在甲苯+水系统的25.0°C下进行平衡界面张力测量。根据从Szyszkowski方程获得的参数,Triton的吸附趋势高于CTAB。通过非理想相互作用的二元混合物(NIBMs)理论分析了表面活性剂混合物的结果,并确定了混合吸附单层中的界面组成和相互作用参数。吸引力相互作用在表面活性剂的体积摩尔分数几乎相等时显示出最大值。 Triton的本体摩尔分数为0.30或更高时,可以达到协同作用;而0.52的本体摩尔分数时,则具有最高的协同作用(40.6%),而最低的恒定界面张力为28.0mNm〜(-1)。建立了相互作用参数随本体摩尔分数变化的相关性。

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