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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.
The number of micelles, C, of the aqueous solution of cetyltrimethylammonium bromide C16TAB and the aqueous solution of sodium laurylsulfate AS at a concentration between the first and second critical micelle concentrations (CMC1 and CMC2) varies with the concentration of With the addition of inorganic salts leads to an increase of C16TAB aqueous solution N. For the C16TAB / AS / H2O system of x2 (mole fraction of cationic surfactant in total surfactant) = 0.7, 0.8 and 0.9, At the same concentration of total surfactant cT, N increases with decreasing x2 For these systems with concentrations near CMC2, N increases with increasing cT and x2 = 0.7 The viscosity of C16TAB / AS / H2O system showed a similar trend with the increase of cT.The addition of inorganic salts made N of C16TAB / AS / H2O system with x2 = 0.8 and 0.9 larger , But higher viscosities, however, for systems with x2 = 0.7, the addition of NaBr reduced N to slightly higher and then lower viscosity than the system without salt. Critical Stacking Parameters, End Caps of Rod Micelles The concept of end-cap energy and Collins water affinity matching is used to explain the experimental results in this paper.