Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.
J Colloid Interface Sci. 2010 Mar 15;343(2):594-601. doi: 10.1016/j.jcis.2009.11.067. Epub 2009 Dec 4.
Measurements of advancing contact angles for aqueous solution of Triton X-100 (TX-100) with methanol, ethanol and propanol mixtures and Triton X-165 (TX-165) with the same alcohols on quartz surface were carried out. From the obtained results it appeared that the wettability of quartz depends on Triton's and alcohol concentrations and that there is a linear dependence between the adhesional and surface tension of aqueous solution of Triton's and alcohols mixtures. This dependence can be described by linear equations which constants depend somewhat on the Triton's and alchohols concentration. The slope of all linear dependencies between the adhesional and surface tension is positive. The critical surface tension of quartz wetting determined from these dependencies by extrapolating the adhesional tension to a value equal to the surface tension (for contact angle equal zero) depends on the assumption whether the concentration of Triton or alcohols was constant. The average value at constant Triton's concentration was equal to 27.1 mN/m and was lower than that evaluated at constant alcohol concentration (29.5 mN/m). The critical surface tension of quartz wetting at constant alcohol concentration was nearly the same as the apolar component of the surface tension of quartz covered with water monolayer film. The positive slope of the adhesional-surface tension curves and the work of water adhesion, Triton's and alcohols to quartz surface indicates that the interaction between water molecules and quartz surface might be stronger than that between quartz and surface active agents molecules. So, the concentration excess of surfactants at quartz-water interface is probably negative, and the possibility of the surface active agents to adsorb at quartz/water film-water interface is higher than that at the quartz-water. However, at alcohol concentration above that of its aggregation the molecules of the surface active agents probably destroy the strongly ordered film of water.
测量了 Triton X-100（TX-100）水溶液与甲醇、乙醇和丙醇混合物以及 Triton X-165（TX-165）与相同醇类在石英表面的前进接触角。从获得的结果来看，石英的润湿性取决于 Triton 和醇的浓度，并且 Triton 和醇混合物水溶液的粘附力和表面张力之间存在线性关系。这种关系可以用线性方程来描述，其常数在某种程度上取决于 Triton 和醇的浓度。所有 Triton 和醇混合物水溶液的粘附力和表面张力之间的线性关系的斜率均为正。从这些关系中通过将粘附力外推到等于表面张力的值（对于接触角等于零）来确定的石英润湿的临界表面张力取决于 Triton 或醇的浓度是否恒定的假设。在 Triton 浓度恒定的情况下，平均临界表面张力为 27.1 mN/m，低于在醇浓度恒定的情况下评估的值（29.5 mN/m）。在醇浓度恒定的情况下，石英润湿的临界表面张力几乎与被单分子水膜覆盖的石英的非极性表面张力分量相同。粘附力-表面张力曲线的正斜率和水、Triton 和醇对石英表面的粘附功表明，水分子与石英表面之间的相互作用可能比石英与表面活性剂分子之间的相互作用更强。因此，表面活性剂在石英-水界面处的浓度过剩可能为负，表面活性剂在石英/水膜-水界面处吸附的可能性高于在石英-水界面处吸附的可能性。然而，在醇浓度高于其聚集浓度时，表面活性剂分子可能会破坏水的强有序膜。
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