关键词: 烷基磺酸钠, 醇—AS 混合胶束, 链烷醇, 稳态荧光分析, 实验方法

Abstract: The effect of alcohols(n-pentanol toneheptanol) on the micellar properties (micelle formation, polarity of micelle interior, micelle ionization degree (a) and aggregation numbers (N_s,N_A) of the mixed alcohol+surfactant micelles) of sodium dodecyl sulfonate (AS)have been investigated by means of electrical conductivity and steady-state fluorescence methods. The experimental results show that with the increase of alcohol concentration both the CMC and N_s initially decreased to a minimum and then increased,the "a" reached a maximum first and decreased beyond it, but the minimum of N_s and the maximum of a are not observed for n-pentanol. The concentration of alcohols where extreme values of CMC,N_s and a decrease and arranged in an order of n-pentanoln-hexanoln-heptanol. These results have been explained in terms of the effect of the stabilized alcohol in the micelle on the surface charge density, and the dielectric constant of the micelle palisade layer.