碱对表面活性剂胶束的影响

Effect of alkali on surfactantmicelle

为了验证碱对表面活性剂胶束形成的影响,采用紫外探针法测试不同碱浓度下"薁"的吸光值,并利用原子力显微镜分析不同碱浓度下胶束的几何尺寸,发现"薁"的吸光值随着溶液中碱浓度的增加而增加;在没加入碱时,表面活性剂胶束颗粒高度较大,约为300～400nm;在加入少量质量分数为0.05%的碱时胶束颗粒高度减小为30～70nm;当碱的质量分数增加至0.2%时,胶束颗粒高度又增大至约160nm。实验结果表明表面活性剂(HABS)在水相的存在形式与传统的认识可能有很大的不同,其胶束可能含有重烷基苯磺酸分子(RArSO3H);加入少量的碱可以破坏此种胶束而增强活性剂单体的"活度",有利于油水界面张力的降低。

In order to verify the effect of alkali on the surfactant micelle,the azulene absorhency and micelle geometrical size at different alkaliconcentrations were tested respectively through the ultravioletprobe measurement and the atomic force microscope analysis method.Some experimental phenomena were found that the value of the azulene absorbency rises with the increase of the concentrationof the alkali.And the height value of the micelle geometricalwas 300 to 400nm with no alkali in the surfactant solution,bu...