四乙基氢氧化铵水溶液的临界胶束浓度的测定  

Critical Micelle Concentration of Tetraethylammonium Hydroxide Aqueous Solution

作　　者：张娴玲[1] 王爱菊[1] 张新胜[1] 徐苹[1] 

机构地区：[1]化学工程联合国家重点实验室,华东理工大学上海200237

出　　处：《应用化学》2007年第4期374-377,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(20376020);厦门大学固体表面物理化学国家重点实验室开放课题(200406)

摘　　要：使用电导率法测定了四乙基氢氧化铵水溶液的第2和第2临界胶束浓度(CMC),其值分别为0.52和38.0 mmol/L。同时在无探针分子条件下用循环伏安法(CV)研究了四乙基氢氧化铵水溶液体系胶束在铂电极(Pt)上的电化学行为,得到1个受扩散控制的氧化峰,并用电位阶跃计时库仑法(CC)测定了胶束的扩散系数,得到了四乙基氢氧化铵的第1和第2临界胶束浓度分别为0.52和41.0 mmol/L。通过以上2种方法的测定,可以确定四乙基氢氧化铵的第1和第2临界胶束浓度分别为0.52和39.5 mmol/L。电导率法和计时库仑法各具特点,均不失为测定表面活性剂临界胶束浓度的好方法。The first and second critical micell concentrations of the tetraethylammonium hydroxide aqueous solution obtained by conductivity method were O. 52 mmol/L and 38.0 mmol/L. Electrochemical behavior of tetraethylammonium hydroxide aqueous solution was investigated by cyclic vohammetry （CV） using a Pt working electrode and a oxidative peak under diffusion control was found. The diffusion coefficients of tetraethylanunonium hydroxide was determined by potential-step chronocoulometry （CC）, and the first and second critical micell concentrations obtained were 0. 52 mmol/L and 41.0 mmol/L. We can conclude that the critical micell concentrations of tetraethanolammonium hydroxide aqueous solution are 0. 52 mmol/L and 39. 5 mmol/L. The results show that the conductivity method and chronocoulometry are all suitable for determining the critical micell concentrations of surfactants.

关 键 词：四乙基氢氧化铵 临界胶束浓度 电导法 计时库仑法 

分 类 号：O647[理学—物理化学] O657[理学—化学]