A CO₂-responsive superamphiphile was designed to form switchable O/W microemulsions of rapid switching responses. The linear structured superamphiphile was assembled via electrostatic interactions between anionic oleic acid and cationic Jeffamine D-230 at a mole ratio of 1:1. Addition of the CO₂-responsive superamphiphile and 1-butanol as a co-surfactant led to the spontaneous formation of stable heptane-in-water microemulsions. Treating this stable microemulsion with CO₂ for 20 s caused dissociation of the superamphiphile into interfacial inactive components, leading to a complete phase separation of the microemulsion into immiscible oil and water phases. Removing the CO₂ from the system by N₂ sparging at 60 °C for 10 min converted the phase-separated system into a transparent microemulsion as a result of the in situ formation of the superamphiphile. Compared with the results from previous studies, the O/W microemulsion formed using the current superamphiphile with the co-addition of 1-butanol featured not only a unique thermodynamical stability of nano-sized droplets, but also a desired response to CO₂ to achieve a rapid and complete phase separation, and re-microemulsification as desired with N₂ sparging, making this CO₂-responsive O/W microemulsion a promising candidate for applications such as nanomaterial synthesis, enhanced oil recovery and soil remediation.

设计CO ₂响应的超_两亲物以形成快速转换响应的可转换的O / W微乳液。线性结构的超两亲物是通过阴离子油酸和阳离子Jeffamine D-230之间的摩尔比为1：1的静电相互作用组装的。加入CO ₂反应性超_两亲物和1-丁醇作为助表面活性剂可自发形成稳定的水包庚烷微乳液。用CO ₂处理这种稳定的微乳液20 s，导致超两亲物解离为界面惰性组分，导致微乳液完全相分离成不混溶的油相和水相。除去CO ₂用N从系统₂在原位形成超两亲物，在60°C鼓泡10分钟可将相分离体系转变为透明微乳状液。与以前的研究结果相比，使用当前的超两亲物与1-丁醇的共添加形成的O / W微乳液不仅具有纳米级液滴独特的热力学稳定性，而且还具有对CO ₂的期望响应以实现快速和完全的相分离，以及通过N ₂鼓泡进行所需的再微乳化，使这种对CO ₂响应的O / W微乳成为诸如纳米材料合成，提高油采收率和土壤修复等应用的有希望的候选者。