石英晶体微天平监测混合表面活性剂的吸附过程

利用液隔电极式石英晶体微天平实时监测了阳离子表面活性剂、非离子表面活性剂及其混合物在石英表面吸附过程中的质量变化,结果表明:混合表面活性剂体系的吸附平衡常数和吸附量较纯组分有明显的增加,但吸附速率有所下降。混合表面活性剂之间存在协调吸附机理,在低浓度区间尤为显著。

Adsorption process of mixed surfactants monitored by quartz crystal microbalance

The mass change during the adsorption process of a cationic surfactant and a nonionic surfactant, as well as their mixture on quartz surface is monitored real time by an electrode-separated quartz crystal microbalance. It is shown that the adsorption equilibrium constant and adsorption density for the surfactant mixture are greater than those of the single surfactant. But the adsorption rate in the mixture is lower than that in pure surfactant. Synergistic adsorption mechanism is exhibited in the surfactant mixture, especially in low concentration region.