pH-Responsive Surface Activity and Solubilization with Novel Pyrrolidone-Based Gemini Surfactants
作者:Zan Jiang、Xuefeng Li、Guangfu Yang、Li Cheng、Bo Cai、Yi Yang、Jinfeng Dong
DOI:10.1021/la3008156
日期:2012.5.8
8 10, 12), were synthesized and characterized by 1H NMR, 13C NMR, ESI-MS, and elemental analysis. The surface activity and micellization behavior at acidic, neutral, and basic conditions were characterized by equilibrium surface tension and fluorescence techniques. It was found that the surface activity of Di-CnP depends on the pH of aqueous solutions due to the protonation state of surfactant molecules
具有2-吡咯烷酮头基,N,N'-二烷基-N,N'-二(乙基-2-吡咯烷酮)乙二胺(Di-C n P,其中n = 6,8合成并通过1 H NMR,13 C NMR,ESI-MS和元素分析对其进行表征。通过平衡表面张力和荧光技术表征了在酸性,中性和碱性条件下的表面活性和胶束化行为。发现当pH变化时,由于表面活性剂分子的质子化状态,Di-C n P的表面活性取决于水溶液的pH。新化合物的cmc和γcmc较低与m -2- m型常规阳离子Gemini表面活性剂和葡糖酰胺型非离子Gemini表面活性剂相比。荧光数据证实当浓度高于cmc时会形成胶束。由于胶束化在表面活性剂应用(例如增溶,微乳液和相关技术)中至关重要,因此采用这种新型Gemini表面活性剂在不同pH值下cmc的显着差异来溶解环己烷。初步结果确实表明,Di-C n P的增溶能力可以通过pH来调节。