Abstract

Tertiary amines (TA) are widely treated as the responsive additions of stimuli-responsive emulsion. The effect of alkane carbon number (ACN) of TA (N,N-Dimethyldecylamine (DMA), N,N-Dimethyldodecylamine (DMDA), N,N-Dimethyltetradecylamine (DMTA) and N,N-Dimethylhexadecylamine (DMHA)) on redox and pH- responsive behavior of emulsion was explored, obtaining a reference to regulate the redox and pH- responsiveness of emulsion precisely. Here, the emulsions are stabilized by the surfactant prepared simply with electrostatic interaction TA and ferrocenecarboxylic acid (FA). The stability of emulsion can be enhanced because of the enhanced surface activity of surfactant with increasing ACN of TA, which was demonstrated by the measurement of water separation ratio (WSR), micrographs and Zeta potential value of emulsion. In addition, by the analysis of micrographs, surfactant tension and interfacial tension, it is demonstrated that the more complete oil-water separation is regulated reversibly because of the larger change value of interfacial tension with increasing ACN upon the alternate addition of Na₂SO₃ and H₂O₂. Besides, the emulsions stabilized by surfactant prepared with TA containing ACN = 10 and 12 exhibit doubly pH-responsive behavior, which is ascribe to the inactivation of surface activity of surfactant at lower and higher pH. However, the emulsions stabilized by surfactant prepared with TA containing ACN = 14 and 16 exhibit single pH-responsive behavior because of the inactivatd surface activity of surfactant at higher pH and activatd surface activity of protonated DMTA and DMHA at lower pH.

摘要

叔胺 (TA) 被广泛视为刺激响应乳液的响应添加物。TA（N,N-二甲基癸胺 (DMA)、N,N-二甲基十二胺 (DMDA)、N,N-二甲基十四胺 (DMTA) 和 N,N-二甲基十六胺 (DMHA)）的烷烃碳数 (ACN) 对氧化还原的影响探索乳液的pH响应行为，为精确调控乳液的氧化还原和pH响应提供参考。在这里，乳液通过简单地用静电相互作用 TA 和二茂铁羧酸 (FA) 制备的表面活性剂来稳定。表面活性剂的表面活性随着 TA 的 ACN 的增加而增强，乳液的稳定性得到了增强，这通过乳液的水分离比 (WSR)、显微照片和 Zeta 电位值的测量得到了证明。此外，₂ SO ₃和H ₂ O ₂。此外，用含有 ACN = 10 和 12 的 TA 制备的表面活性剂稳定的乳液表现出双重的 pH 响应行为，这归因于表面活性剂在较低和较高 pH 值下表面活性的失活。然而，由含有 ACN = 14 和 16 的 TA 制备的表面活性剂稳定的乳液表现出单一的 pH 响应行为，因为表面活性剂在较高 pH 值时表面活性不活化，而质子化 DMTA 和 DMHA 在较低 pH 值时表面活性活化。