一种由超滤膜测定阴离子表面活性剂临界胶束浓度的新方法

A Novel Method for Determining Critical Micelle Concentrations of Anionic Surfactants by Ultra filtration Membrane

表面活性剂临界胶束浓度（ｃｍｃ）是表征表面活性剂胶体电解质性质的重要理化指标．常用的ｃｍｃ测定方法有光散射法、染料法、增溶法、电导法和表面张力法等［１］．这些方法的共同特点是依据表面活性剂在ｃｍｃ附近某些理化性质的突变特性，从发生突变的函数不连续区域...

A novel 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.