关键词: 表面活性剂, 临界胶束浓度, 中空纤维超滤膜, 膜分离法, 超滤

Abstract: Anovel method for determining critical micelle concentrations(cmc) of surfactants by membrane is developed. Micellar aggregates and isolated molecules in micellar solutions of surfactants are separated by ultra-filtration membrane with suitable pore diameter, followed by quantitatively detecting of surfactants in ultra-filtrated liquid by anion cation two phase titration, thus, cmc of anionic surfactants can be known quickly and accurately. This method directly depends on the difference of sizes between micelle and molecule of a surfactant, but not on other sharp break in the plot of properties vs. concentration of a surfactant, hence, it is not necessary to get only one cmc from a series of surfactant solutions.

Key words: Surfactant, Critical micelle concentration, Hollow fibrous ultra filtration membrane, Separation by membrane, Ultra-filtration