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中文摘要：
用稳态和震荡剪切实验研究了水杨酸钠（NaSal）对50mmo·lL-1阳离子Gemini表面活性剂2-羟基-（三亚甲基-α,ω-双十二烷基三甲基溴化铵和三亚甲基-α,ω-双十二烷基三甲基溴化铵,简写为12-3（OH）-12和12-3-12）水溶液中形成蠕虫状胶束及其性质的影响.在无盐状态下,50mmo·lL-1的12-3（OH）-12或12-3-12在水溶液中仅形成球状或棒状胶束.NaSal可促进上述两体系胶束的生长,生成蠕虫状胶束.比较而言,12-3（OH）-12对NaSal更敏感,可以在低盐浓度下生成蠕虫状胶束.而且与12-3-12体系相比,12-3（OH）-12生成了更长的蠕虫状胶束.这些差别在于12-3（OH）-12体系中存在羟基连接链之间的氢键作用,这增加了12-3（OH）-12头基的亲水性,促进了反离子的解离,增大的胶束表面电荷密度更强烈地结合水杨酸根反离子,减小了头基间的静电斥力,反过来又增强了分子间氢键,致使12-3（OH）-12胶束迅速生长.
英文摘要：
The effect of sodium salicylate （NaSal） on the formation and properties of wormlike micelles in aqueous solutions of 2-hydroxyl-propanediyl-α,ω-bis（dimethyldodecylammonium bromide） （12-3（OH）-12） and propanediyl-α,ω-bis（dimethyldodecylammonium bromide） （12-3-12） at a surfactant concentration of 50 mmol·L-1 was investigated using steady-state and frequency sweep rheological measurements. In the absence of a salt, 12-3（OH）-12 or 12-3-12 only produced spherical or small rod-like micelles at 50 mmol·L-1. The addition of NaSal promoted micellar growth yielding wormlike micelles in both systems. 12-3（OH）-12 showed a more sensitive response to the added NaSal compared with 12-3-12 and formed wormlike micelles at relatively lower salt concentrations. Moreover, the wormlike micelles formed by 12-3（OH）-12 were longer than those formed by 12-3-12, resulting in higher viscosity for the former solution. These were attributed to the hydrogen bonding interactions between the hydroxyl substituted spacers in the 12-3（OH）-12 system, which increased hydration on the aggregate surface and stimulated the dissociation of counterions. The higher charge on the 12-3（OH）-12 micellar surface was strongly associated with Sal-, which led to a tighter packing of the surfactant molecules in the micelles and thus strengthened the intermolecular hydrogen bonding interactions and effectively reinforced the growth of the 12-3（OH）-12 micelles.
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