链烷醇对烷基磺酸钠胶束性质的影响

本文用电导法和稳态荧光法研究了正戊醇、正己醇与正庚醇对十二烷基磺酸钠(AS)胶束的形成、胶束内的微极性、AS-醇混合胶束的聚集数(N_s,N_A),和胶束电离度的影响.实验结果表明,AS的CMC和随醇浓度增加经历一最小值,而α则有最大值.但在所研究的AS浓度范围内,对戊醇则观测不到的最小值和α的最大值.以上最小值和最大值所对应醇的浓度依下列次序减小:正戊醇>正己醇>正庚醇.上述结果利用胶束增溶的醇对表面电荷密度和“栅栏”层介电常数的影响进行了解释.

EFFECT OF ALCOHOLS ON THE PROPERTIES OF SODIUM ALKYLSULFONATE MICELLES

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.