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Science in China Series B: Chemistry

, Volume 45, Issue 1, pp 68–72 | Cite as

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

  • Zhou Guowei
  • Li Ganzuo
  • Chen Wenjun
  • Lou Anjing
  • Bao Meng
Article

Abstract

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.

Keywords

W/O microemulsion FT-IR least square curve fitting molecular conformation 

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Copyright information

© Science in China Press 2002

Authors and Affiliations

  • Zhou Guowei
    • 1
  • Li Ganzuo
    • 1
  • Chen Wenjun
    • 1
  • Lou Anjing
    • 2
  • Bao Meng
    • 3
  1. 1.Key Laboratory for Colloid and Interface Chemistry of Ministry of Education of ChinaShandong UniversityJinanChina
  2. 2.Langmuir Center for Colloids and InterfacesColumbia UniversityNew YorkUSA
  3. 3.Chemistry Department of Jinan UniversityJinanChina

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