Abstract
Transient electric-birefringence (TEB) studies have been carried out on w/o microemulsions stabilized by Ni(AOT)2 the nickel salt of di(ethyl) hexylsulphosuccinate at various volume fractions ø and water contents w = [H2O]/[Ni(AOT)2]. The system forms rod-shaped droplets at low w which convert to more spherical aggregates as w is increased. TEB data have been obtained as a function of microemulsion volume fraction, water content, and temperature. Relaxation transients of the electric birefringence signal were found to be non-exponential and have been analyzed by assuming that the rods are rigid and polydisperse. The average rod length L m of the droplets is determined from the initial fast relaxation of the transients. It is found that L m grows as the square root of ø. At fixed volume fraction, the curve L m vs. w presents a maximum at a value of w around 30.
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© 1998 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Mantegazza, F., Degiorgio, V., Price, A.L., Steytler, D.C., Robinson, B.H. (1998). Electric birefringence study of rod-shaped water-in-oil microemulsions. In: Koper, G.J.M., Bedeaux, D., Cavaco, C., Sager, W.F.C. (eds) Trends in Colloid and Interface Science XII. Progress in Colloid & Polymer Science, vol 110. Steinkopff. https://doi.org/10.1007/BFb0118072
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DOI: https://doi.org/10.1007/BFb0118072
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