电导法测定阳离子型表面活性剂临界胶束浓度实验研究

Experimental Study on the Critical Micelle Concentration of Cationic Surfactant with Conductivity Method

采用电导法测定一定温度下不同浓度的十四烷基三甲基氯化铵(TTAC),十六烷基三甲基氯化铵(CTAC),十八烷基三甲基氯化铵(STAC)溶液的电导率值,计算摩尔电导率,研究碳链上碳原子数对表面活性剂临界胶束浓度(CMC)的影响。结果表明:CMC(TTAC)=0.00580 mol/L,CMC(CTAC)=0.0041mol/L,CMC(STAC)=0.0039 mol/L,可知随着碳链上碳原子个数的增多,相应的临界胶束浓度(CMC)呈减小趋势。

Conductance method was used to determine the conductively of myristyl trimethyl ammonium chloride（TTAC）,hexadecyl trimethyl ammonium chloride（CTAC）and octadecyl trimethyl ammonium chloride（STAC）solutions with different concentrations at a certain temperature,and their conductivity was calcutated the influence of the number of carbon atoms in the chain on the critical micelle concentration（CMC）of the surfactant was studied.The results showed that the CMC（TTAC）= 0.00580 mol/L,CMC（CTAC）=0.0041mol/L,CMC（STAC）=0.0039mol/L,indicating that the critical micelle concentration（CMC）was decreased with the increase of carbon number in the chain.