【摘要】 浓度处于第一和第二临界胶束浓度(CMC1和CMC2)之间的十六烷基三甲基溴化铵C16TAB水溶液和十二烷基磺酸钠AS水溶液的胶束聚集数N随浓度的增大而线性增大.无机盐的加入导致C16TAB水溶液N的增大.对于x2(阳离子表面活性剂在总表面活性剂中的摩尔分数)=0.7,0.8和0.9的C16TAB/AS/H2O系统,在相同表面活性剂总浓度cT下,N随x2的减小而增大.对于浓度在CMC2附近的这些系统,N随cT的增大而增大,且x2=0.7的复配系统的棒状胶束显现出显著的伸长趋势.C16TAB/AS/H2O系统的粘度随cT的增大表现出类似的变化趋势.无机盐的加入使x2=0.8和0.9的C16TAB/AS/H2O系统的N更大,粘度更高.可是,对于x2=0.7的系统,NaBr的加入却使N减小,使粘度比不加盐的系统先略微高些然后更低些.临界堆积参数,棒状胶束的端盖能(end-cap energy)和Collins的水亲合性匹配的概念被用于解释本文的实验结果.更多还原

【Abstract】 Micellar aggregation numbers N of cetyltrimethylammonium bromide C16TAB/H2O and sodium dodecylsulfonate AS/H2O systems with concentrations between the first and the second critical micelle concentrations(CMC1 and CMC2) increase linearly with increasing concentration.The addition of inorganic salt into C16TAB/H2O systems leads to larger N.For the C16TAB/AS/H2O mixed systems with x2=0.7,0.8 and 0.9(x2 is the mole fraction of cationic surfactant in the total mixed surfactants),at the same total surfactant concentration cT,N increases with decreasing x2.For these mixed systems with concentrations near CMC2,N increases with increasing cT,and the rodlike micelles of the mixed systems with x2=0.7 shows enhanced elongation tendency.Viscosities of the C16TAB/AS/H2O mixed systems show similar changing tendency with cT.The addition of inorganic salt into the C16TAB/AS/H2O mixed systems with x2=0.8 and 0.9 leads to larger N and higher viscosities.However,for the mixed systems with x2=0.7 near CMC2,the addition of NaBr leads to smaller N,and slightly higher viscosity first and lower viscosity afterwards.Critical packing parameter,end-cap energy of the rodlike micelles and Collins’ concept of matching water affinities were used to interpret the experimental results.更多还原