烷基苯磺酸钠胶团的ESR研究

An ESR Study on Sodium Alkylbenzensulfonate Micelles

利用ESR测定了自由基探针5-doxyl stearic acid在烷基苯磺酸钠溶液中超精细偶合常数(AN)和旋转相关时间(τR).根据AN随浓度的变化规律测定了表面活性剂的临界胶团浓度(cmc),并与表面张力法的结果作了对比.通过分析AN和τR数据,讨论了位于磺酸根邻位的疏水短链的长度变化对胶团微极性和微粘度的影响.结果表明,当疏水短链的碳原子数增加时,临界胶团浓度降低,胶团微极性增加,胶团微粘度降低.

The hyperfine splitting constant and the correlation time of 5-doxyl stearic acid in the solution of sodium alkylb paramagnetic resonance （ESR）. Th mined and that the m compared with the result icelle microviscos carbon number of the short group. enzensulfonates （ABS） were measured by electron e critical micelle concentration of ABS was deter-derived from surface tension curve. It was found ity decreased hydrophobic and the micelle micropolarity increase group at the ortho position of the su d with the lfonic acid