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Effect of Polysorbates on Solids Wettability and Their Adsorption Properties

机译：聚山梨酯对固体润湿性及其吸附性能的影响

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The wettability of solids is important from both practical and theoretical viewpoints. In this study, we measured the contact angle of aqueous solutions of polysorbates (Tween 20, Tween 60, and Tween 80) on polytetrafluoroethylene (PTFE), polyethylene (PE), polymethyl methacrylate (PMMA), polyamide (nylon 6), and quartz. Based on the obtained results, the adsorption of Tween 20 (T20), Tween 60 (T60), and Tween 80 (T80) at the solid-water interface was determined based on the structure and size of their molecules. Next, the tendency of polysorbates to adsorb at the solid-water interface was considered based on the Gibbs standard free energy of adsorption (ΔGadso). This energy was evaluated using various methods, including a method we propose based on the critical micelle concentration (CMC) and the contact angle of water and solution at the CMC, as well as their surface tension. The ΔGadso values obtained by this method were comparable to those calculated from the Langmuir equation. Taking into account the Tweens tendency to adsorb at the solid-water interface, the measured contact angle, the components and parameters of surface tension of Tweens solutions and solids, and the surface tension of water and its Lifshitz-van der Waals component that we determined, the wetting process in the solid-solution drop-air system was analyzed. The results based on the mentioned parameters showed that it is possible to predict the wettability of apolar, monopolar, and bipolar solids using the aqueous Tweens solution and their solution adhesion.
机译：从实践和理论观点来看，固体的润湿性都是重要的。在这项研究中，我们测量了聚山梨酯水溶液（吐温20，吐温60和吐温80）在聚四氟乙烯（PTFE），聚乙烯（PE），聚甲基丙烯酸甲酯（PMMA），聚酰胺（尼龙6）和石英上的接触角。基于获得的结果，基于吐温20（T20），吐温60（T60）和吐温80（T80）在固-水界面的吸附，基于它们的分子结构和大小确定。接下来，基于吉布斯标准吸附自由能（ΔGadso）考虑了聚山梨酯在固体-水界面上吸附的趋势。使用多种方法对能量进行了评估，包括我们基于临界胶束浓度（CMC）和水与溶液在CMC处的接触角及其表面张力提出的方法。通过该方法获得的ΔGadso值与根据Langmuir方程计算的那些相当。考虑到吐温在固体-水界面上的吸附趋势，测得的接触角，吐温溶液和固体表面张力的成分和参数，以及我们确定的水及其Lifshitz-van der Waals成分的表面张力，对固溶液滴空气系统中的润湿过程进行了分析。基于上述参数的结果表明，使用Tweens水溶液及其溶液粘附力可以预测非极性，单极性和双极性固体的润湿性。

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