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Determination of water states and the structural parameters of W/O microemulsions |
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| Authors: | Zhou Guowei LI Ganzuo LOU Anjing Chen Wenjun BAO Meng |
| Affiliation: | 1. Key Laboratory for Colloid and Interface Chemistry of Ministry of Education of China, Shandong University, 2. Langmuir Centre for Colloids and Interfaces, Columbia University, 3. Langmuir Centre for Colloids and Interfaces, Columbia University, New York 10027, USA Chemistry Department of Jinan University, |
| Abstract: | The states of water in sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/isooctane/water reverse(W/O) microemulsions system have been investigated by using Fourier transform infrared spectroscopy(FT-IR) technique. The broad peak obtained for hydroxy(O-H) of water has been resolved by least square curve-fitting. It has been observed that the water solubilized in microemul-sion droplets has four states, i.e. bound water with sulfo-group, free water, bound water with sodium counterion in the water pool of microemulsion droplets and a small amount of trapped water in the palisade layer of microemulsion droplets. The following have also been determined: the aggregation number (n), the radius of the water pool in the microemulsions(rw), the thickness of the bound water with sulfo-group(d1), the thickness of the bound water with sodium counterion(d2), the total thickness of the bound water (d) and the effective area of head groups of AOT(AAOT). |
| Keywords: | W/O microemulsions FT-IR curve-fitting structural parameters. |
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