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Citation: Li Quan, Weng Shifu, Wu Jinguang. FT-IR Study on the Hydration of Sulfonate in Water/AOT/n-Heptane Microemulsion system[J]. Chinese Journal of Applied Chemistry, ;1998, 15(1): 1-4. shu

FT-IR Study on the Hydration of Sulfonate in Water/AOT/n-Heptane Microemulsion system

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

Received Date: 13 May 1997
Revised Date: 3 September 1997

Hydration of sulfonate in water/AOT/n-heptane (AOT=sodium bis (2-ethylhexyl) sulfosuccinate) microemulsion system has been investigated by means of FT-IR. The results show that the hydration of sulfonate in the system leads to a shift of symmetric sulfonate stretching mode from 1051.39 cm^-1 to 1046.15 cm^-1 in the infrared spectra with the increase of the molar ratio of water to AOT, W₀. The formation of microemulsions weakens the interaction between counterion Na⁺ and -SO₃^-, groups, compared with that in the solid state AOT. The splitting of the antisymmetric sulfonate stretching mode in the in-frared spectra reduces from ca. 42 cm^-1 to 29 cm^-1 upon the addition of water into the sys-tem. The intensity of ~1215 cm^-1 increases, while the peak of ~1245 cm^-1 decreases corre-spondingly with the increase of W₀.
- sodium bis (ethylhexyl) sulfosuccinate,
- microemulsion system,
- hydration,
- infrared spectrometry
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