一种表面活性剂临界胶束浓度测定方法研究

A method for determination of critical micelle concentrations of surfactants

测量吖啶化合物作为发光剂在系列浓度的表面活性剂溶液的化学发光值,根据所得发光值的对数值与其对应的表面活性剂溶液中表面活性剂浓度的对数值进行线性拟合得出若干条拟合直线,相邻两条拟合直线的交点对应的表面活性剂浓度中的最小值即为该表面活性剂的临界胶束浓度。由测定结果可知,十二烷基三甲基氯化铵的临界胶束浓度是11.5 mmol/L,十六烷基三甲基溴化铵的临界胶束浓度是0.357 mmol/L,十二烷基硫酸钠的临界胶束浓度是7.64 mmol/L,N-月桂酰肌氨酸钠的临界胶束浓度是0.890 mmol/L,TX-100的临界胶束浓度是0.309 mmol/L,3-[3-(胆酰胺丙基)二甲氨基]丙磺酸内盐的临界胶束浓度是9.53 mmol/L,月桂基二甲基磺基甜菜碱的临界胶束浓度是1.73 mmol/L。测定结果与传统方法近似,可以应用于表面活性剂临界胶束浓度的研究。

The chemiluminescence values of an acridine compound as a luminescent agent in the surfactant solutions with a series of concentrations were measured;according to both the logarithms of the luminescence value obtained and the surfactant concentration, linear fitting was carried out to obtain fitting lines, and the minimum value of the surfactant concentration corresponding to the intersection of the two adjacent fitting lines was the critical micelle concentration of the surfactant. According to the results, the critical micelle concentration of dodecyl trimethyl ammonium chloride is 11.5 mmol/L, hexadecyl trimethyl ammonium bromide is 0.357 mmol/L, sodium dodecyl sulfate is 7.64 mmol/L, sodium N-lauroylsarcosinate is 0.890 mmol/L, Triton X-100 is 0.309 mmol/L, 3-((3-cholamidopropyl)dimethylammonium)-1-propanesulfonate is 9.53 mmol/L, and 3-(N,N-dimethyldodecylammonio)propanesulfonate is 1.73 mmol/L. The results are consistent with those obtained by traditional methods, indicating that the method can be used in the measurement of critical micelle concentrations of surfactants.