Synthesis and Surface Properties of Anionic Gemini Surfactants having N-acylamide and Carboxylate Groups
作者:Yan Zhou、Yun Cheng、Chunyu Han、Junling Lai、Lin Sui、Genxiang Luo
DOI:10.1007/s11743-013-1558-x
日期:2014.7
synthetic strategy to an anionic gemini surfactant having both N‐acylamide and carboxylate groups in a molecule has been demonstrated. The surface properties of the anionic gemini surfactant, such as CMC (critical micelle concentration), C20 (the concentration required to reduce the surface tension of the solvent by 20 mN/m), γCMC (the surface tension at the CMC), ∏CMC (the surface pressure at the CMC)
已经证明了在分子中同时具有N-酰基酰胺基和羧基基团的阴离子双子表面活性剂的直接合成策略。的阴离子双子表面活性剂,例如CMC(临界胶束浓度),C表面性质20(所需的浓度由20 MN,以减少溶剂的表面张力/米),γ CMC(在CMC中的表面张力),Π的CMC(在CMC中的表面压力),Γ最大(最大表面过量浓度在空气/水溶液界面),甲分钟(在空气/水界面每个表面活性剂分子的最小面积),以及CMC / C已经研究了20的比率(相对于在空气/水界面处的吸附形成胶束的趋势的量度)。讨论了不同浓度的NaCl对双子表面活性剂表面性能的影响。结果表明,CMC值随NaCl浓度的增加而降低,表明Na +优先吸附在带电骨料的表面上,并通过抑制头基之间的静电排斥的主要障碍而促进了骨料的生长。另外,由于盐析作用,盐溶液中的Γmax值总是比纯水中的Γmax高。较大的pC 20值表明表面活性剂在空气/水界面更有效地吸附并更