FT-IR studies on the conformation and effective head-group area of AOT molecules in W/O microemulsions  

作　　者：周国伟 鲍猛 李干佐 陈文君 

出　　处：《Science China Chemistry》2002年第1期68-72,共5页中国科学（化学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No.29973023); Visiting Scholar Foundation of Ministry of Education and State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum Institu

摘　　要：Using Fourier transform infrared(FT-IR) spectroscopy technique, the carbonyl stretching vibration bands of AOT in sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/isooctane/water reverse (W/O) microemulsions system have been investigated by least square curve fitting. The results indicate that an asymmetric adsorbed peak of carbonyl stretching vibration of AOT molecule is situated in (1739 ± 1) and (1725 ± 2) cm-1. The two peaks correspond to different carbonyls in gauche conformation and trans conformation of AOT molecules, respectively. With different water contents (W 0), the variations of peak intensity ratio (I r1= I 1739/I 1725) reflect the change of the ratio for the two conformation populations and the variations of the effective head-group area of AOT molecule have relations to the ratio of two conformation populations.Using Fourier transform infrared(FT-IR) spectroscopy technique, the carbonyl stretching vibration bands of AOT in sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/isooctane/water reverse (W/O) microemulsions system have been investigated by least square curve fitting. The results indicate that an asymmetric adsorbed peak of carbonyl stretching vibration of AOT molecule is situated in (1739 ± 1) and (1725 ± 2) cm-1. The two peaks correspond to different carbonyls in gauche conformation and trans conformation of AOT molecules, respectively. With different water contents (W0), the variations of peak intensity ratio (/= l1739/l1725) reflect the change of the ratio for the two conformation populations and the variations of the effective head-group area of AOT molecule have relations to the ratio of two conformation populations.

关 键 词：W/O MICROEMULSION FT-IR least square curve fitting molecular conformation. 

分 类 号：O657.3[理学—分析化学]