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Citation: Li Quan, Li Wei-Hong, Weng Shi-Fu, Wu Jin-Guang, Xu Guang-Xian. FT-IR Study of Water Structure in Water/AOT/n-Heptane Microemulsion System[J]. Acta Physico-Chimica Sinica, ;1997, 13(05): 438-444. doi: 10.3866/PKU.WHXB19970510 shu

FT-IR Study of Water Structure in Water/AOT/n-Heptane Microemulsion System

1.
College of Chemistry and Molecular Engineering,Peking University,Beijing 100871

Received Date: 27 November 1996
Available Online: 15 May 1997

Microstructure of water in water/AOT/n-heptane microemulsion system has been studied using fourier transform infrared spectroscopy (FT-IR). Intensity and peak position of O-H stretching band of water in the system were found to change with water content Wo, i.e. the molar ratio of water to surfactant (H2O/AOT). Intensity of O-H stretching vibration in the range of 3050 and 3750 cm-1 increased with water content and the frequency was also found to vary from 3493 to 3417 cm-1 in the system with increasing Wo values (from 1 to 60). Four types of circumstance of water exist in the microemulsion system located around 3590±20 cm-1, 3520±10cm-1, 3465±10 cm-1 and 3270±20 cm-1 were estimated after O-H stretching bands were resolved by curve fitting. The stretching band of carboxide splitted into two peaks located at 1739±2cm-1and 1722±2 cm-1 and the intensity ratio Ir(I1739/I1722) decreased with water content. These variations are due to both the hydration of head-group and the different conformation in AOT molecule.
- FT-IR;Water,
- Curve-fitting,
- sodium bis(2-ethylhexyl) sulfosuccinate(AOT),
- Microemulsion Solutions
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