470685 Origin and Nature of Charge Carriers in Nonpolar Solvents
These observations suggest that larger, wormlike micelles should be highly potent charging agents. To test this, we have synthesized a series of phospholipid-derived surfactants known to form wormlike micelles in nonpolar solvents. In this presentation we will present their concentration-dependent conductivity enhancement in nonpolars and compare it to the charge-fluctuation theory developed by Eicke and coworkers . We have also synthesized a library of AOT-like surfactants with varying head and tail group chemistry and counterions. These materials have very different chemical composition but form micelles of similar size. Conductivity and impedance spectroscopy measurements on each reveal the relative importance of micelle size and chemical composition on their effectiveness as charging agents, and suggest mechanisms for the origin of charge formation in doped nonpolar liquids. These will also be discussed along with a consideration of the role of adventitious water in these systems.
 B.A. Yezer, A.S. Khair, P.J. Sides and D.C. Prieve, J. Colloid Interface Sci. (2014), dx.doi.org/10.1016/j.jcis.2014.08.052.
 Eicke H-F, Borkovec M, Das-Gupta B. Conductivity of Water-In-Oil Microemulsions: A Quantitative Charge Fluctuation Model. J Phys Chem. 1989;93:314-7.
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