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在无探针条件下用循环伏安法测定了不同形状SDS和CTAB胶束的扩散系数，进而得到第一CMC和第二CMC（SDS：第一CMC和第二CMC分别为8．0×10－3和5．6×10－2mol·L-1;CTAB：第一CMC和第二CMC分别为8．9×10－4和2．1×10－2mol·L－1）．此法为表面活性剂体系物理化学性质的研究，特别是为第二CMC测定提供了一个新的研究方法．
The diffusion coefficients of SDS and CTAB micelles with different shapes were measured by cyclic voltammetry without probe, and the first CMC and the second CMC were obtained (SDS: the first CMC and the second CMC were 8.0 × 10 -3 and 5.6 × 10 -2 mol·L -1; CTAB: 8.9 × 10 -4 and 2.1 × 10 -2 mol·L -1 for the first CMC and the second CMC, respectively). This method is a study of the physicochemical properties of the surfactant system, especially for the second CMC assay provides a new research method.