COLL 151 |
| Erika Szekeres, School of Chemical Engineering and Materials Science, University of Oklahoma, 100 East Boyd Street, Sarkleys Energy Center, Room T-335, Norman, OK 73019, Edgar J. Acosta, Department of Chemical Engineering, University of Oklahoma, 100 East Boyd, Sarkeys Engineering Center, room T-334, Norman, OK 73019, David A. Sabatini, Department of Civil Engineering and Environmental Science, University of Oklahoma, 202 West Boyd, Carson Engineering Center, room 334, Norman, OK 73019, and Jeffrey H. Harwell, College of Engineering, University of Oklahoma, 202 W. Boyd, Carson Engineering Center, Room 107, Norman, OK 73019. |
| A mathematical model of the equilibrium solubilization of mixtures of polar and non-polar oils has been developed for saturated anionic Winsor Type I and Type III microemulsions. Solubilization experiments had been carried out suggesting that the polar oil tends to accumulate close to the surfactant layer whereas the non-polar oil prefers the core of the solubilized oil domain, thereby leading to a polar oil surface excess. Based upon this result we extended the net-average curvature model of microemulsions by incorporating a Langmuirian type surface excess model. The model uses the following three empirical parameters: two Langmuir constants, and the scaling constant of the net-average curvature model, which is closely related to the length of the surfactant tail. The model predicts the solubilization of the individual components, the microstructure, and the phase behavior as a function of oil mixture composition and electrolyte concentration in accordance with the experimental data. |
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Symposium in Memory of Arthur W. Adamson
2:00 PM-5:40 PM, Monday, March 29, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |