Rapid determination of surfactant critical micelle concentration in aqueous solutions using fiber-optic refractive index sensing
Rapid determination of surfactant critical micelle concentration in aqueous solutions using fiber-optic refractive index sensing
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DOI：
10.1016/j.ab.2010.02.021
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发表时间：
2010-06-01
影响因子：
2.9
通讯作者：
Huang, Xu Guang
中科院分区：
文献类型：
--
作者：
Tan, Chun Hua;Huang, Zhen Jian;Huang, Xu Guang
我们描述了一种简单快速的方法，用于通过折射率的光纤测量来确定表面活性剂的临界胶束浓度（CMC）。随着表面活性剂浓度的增加，使用自动分配系统监测表面活性剂水溶液的折射率。当达到表面活性剂的CMC值时，观察到折射率随着浓度的增加而增加的速率发生突然变化。该测量系统提供快速的半自动数据收集和分析，提高了该技术的精度、灵敏度和适用范围，同时大大减少了所需的手动干预量。十二烷基硫酸钠 (8.10 mM)、十六烷基三甲基氯化铵 (1.58 mM) 和 Triton X-100 (0.21 mM) 的 CMC 测量结果与文献中先前报道的值非常一致。该方法适用于阳离子、阴离子和非离子表面活性剂，并且提供了一种简便、原位且灵敏的方法，可在大于 10(-1) mM 的较宽 CMC 值范围内检测胶束形成。 (C) 2010 Elsevier Inc. 保留所有权利。
We describe a simple and rapid method for determining the critical micelle concentration (CMC) of surfactants from fiber-optic measurements of refractive index. The refractive index of an aqueous surfactant solution was monitored as the surfactant concentration was increased using an automated dispensing system. On reaching the surfactant's CMC value, an abrupt change was observed in the rate of increase of the refractive index with increasing concentration. The measurement system provides rapid semiautomatic data collection and analysis, increasing the precision, sensitivity, and range of applicability of the technique while substantially decreasing the amount of manual intervention required. Measurements of CMC for sodium dodecyl sulfate (8.10 mM), cetyltrimethylammonium chloride (1.58 mM), and Triton X-100 (0.21 mM) were in excellent agreement with values previously reported in the literature. The method is applicable to cationic, anionic, and nonionic surfactants, and it offers a facile, in situ, and sensitive means of detecting micelle formation over a broad range of CMC values larger than 10(-1) mM. (C) 2010 Elsevier Inc. All rights reserved.