Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian, People's Republic of China.
J Colloid Interface Sci. 2011 Apr 1;356(1):176-81. doi: 10.1016/j.jcis.2010.12.065. Epub 2010 Dec 29.
The formation and the properties of wormlike micelles in aqueous solutions of mixed cationic and anionic gemini surfactants, 2-hydroxyl-propanediyl-α,ω-bis(dimethyldodecylammonium bromide) (12-3(OH)-12) and O,O'-bis(sodium 2-dodecylcarboxylate)-p-benzenediol (C(12)ϕC(12)), have been studied by steady-state and dynamic rheological measurements at 25°C. With the addition of a small amount of C(12)ϕC(12) into the solution of 12-3(OH)-12, the total surfactant concentration of which was always kept at 80 mmol L(-1), the solution viscosity was strongly enhanced and its maximum was much larger than that of the mixed system of propanediyl-α,ω-bis(dimethyldodecylammonium bromide) (12-3-12) and C(12)ϕC(12). The results of dynamic rheology measurements showed that 12-3(OH)-12/C(12)ϕC(12) formed longer wormlike micelles in comparison with 12-3-12/C(12)ϕC(12). This was attributed to the effect of hydrogen bonding occurring between 12-3(OH)-12 molecules, which was an effective driving force promoting micellar growth. As few C(12)ϕC(12) participated in the micelles, the electrostatic attraction between the oppositely charged head groups of 12-3(OH)-12 and C(12)ϕC(12) made the molecules in the aggregates pack more tightly. This reinforced the hydrogen-bonding interactions and greatly promoted the micellar growth.
在 25°C 下，通过稳态和动态流变学测量研究了混合阳离子和阴离子双子表面活性剂，2-羟基丙二基-α，ω-双（二甲基十二烷基溴化铵）（12-3（OH）-12）和 O，O'-双（十二烷基羧酸酯）-对苯二酚（C（12）ϕC（12））在水溶液中的蠕虫状胶束的形成和性质。在总表面活性剂浓度始终保持在 80mmolL（-1）的情况下，向 12-3（OH）-12 溶液中添加少量 C（12）ϕC（12）时，溶液粘度大大增强，其最大值远大于丙二基-α，ω-双（二甲基十二烷基溴化铵）（12-3-12）和 C（12）ϕC（12）的混合体系。动态流变学测量结果表明，与 12-3-12/C（12）ϕC（12）相比，12-3（OH）-12/C（12）ϕC（12）形成了更长的蠕虫状胶束。这归因于 12-3（OH）-12 分子之间氢键的发生，这是促进胶束生长的有效驱动力。由于只有少量 C（12）ϕC（12）参与胶束，因此 12-3（OH）-12 和 C（12）ϕC（12）的带相反电荷的头基之间的静电吸引使聚集物中的分子排列更紧密。这加强了氢键相互作用，并极大地促进了胶束生长。
