分子内扭转电荷转移探针DMABN测定表面活性剂水溶液的临界胶团浓度  

Determination of the Critical Micelle Concentration of Surfactant in Aqueous Solution by Twisted Intramolecular Charge Transfer Probe DMABN

作　　者：林翠英[1] 宋利[1] 赵剑曦[1] 

机构地区：[1]福州大学化学化工学院应用化学系,福州350002

出　　处：《物理化学学报》2007年第12期1846-1850,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20673021)资助项目

摘　　要：以对二甲氨基苯甲腈(DMABN)为探针,测定它在表面活性剂(C12TABr、SDS、C12E23、C12-3-C12·2Br)水溶液中的第二重荧光强度(Ia)和对应的特征波长(λa)对表面活性剂浓度(c)曲线,由Ia-c曲线的转折点或λa-c曲线对应的一阶导数极小点可以获得临界胶团浓度(cmc).由于C12-3-C12·2Br在水溶液中强烈聚集,利用λa-c曲线还可以获得其胶团结构松散度的信息.With p-N,N-dimethylaminobenzonitrile（DMABN）as a probe,the variations of the intensity of its second fluorescence emission（Ia）and the corresponding characteristic wavelength（λa）with the surfactant concentration（c）,here the examined surfactants（C12TABr,SDS,C12E23,and C12-3-C12·2Br）,were measured by Hitachi F4500 fluorescence spectrophotometer.The results showed that both the break point on the Ia-c curve and the minimum of the derivative variation corresponding to the λa-c curve agreed very well with the critical micelle concentration（cmc）of the surfactant in aqueous solution as measured by surface tension technique.Due to strong aggregation of C12-3-C12·2Br in aqueous solution,the information about loose micellar structure could be obtained by its λa-c curve.

关 键 词：分子内扭转电荷转移探针 双重荧光 DMABN 临界胶团浓度 

分 类 号：O648.1[理学—物理化学]