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Charging of inverse micelles in nonpolar liquids

Filip Beunis (UGent) , Filip Strubbe (UGent) , Masoumeh Karvar (UGent) and Kristiaan Neyts (UGent)
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Center for nano- and biophotonics (NB-Photonics)
Abstract
The ability of surfactants in nonpolar liquids to stabilize charges on colloidal particles or in inverse micelles is increasingly important for applications such as electrophoretic displays and liquid toner printing. However, inverse micelle charging in nonpolar liquids is not completely understood. This study considers both bulk mechanisms and processes at liquid/electrode interfaces as the origin of charged inverse micelles. We apply a voltage over a layer of n-dodecane with the surfactant polyisobutylene-succinimide, and measure the resulting current. Information about the generation of charges is obtained from the remaining current after the initially present charges have reached equilibrium. At high voltages, disproportionation and comproportionation of inverse micelles explain the measured currents. At low voltages, the residual current is proportional with the electric field near the electrodes, which can not be explained by bulk generation. We interpret these results by assuming that inverse micelles exchange charge with an adsorbed layer of surfactant at the electrodes. These findings are relevant for technologies in which charge injection at the electrodes contributes to power consumption and hydrodynamic instabilities, such as microfluidics and electrophoretic displays.
Keywords
Charge transport, nonpolar liquid, Inverse micelle, colloid, surfactant, Electronic paper, Electrokinetics, Charging reaction, interface, Electrophoretic display, Electric current, Microfluidics

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Citation

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Chicago
Beunis, Filip, Filip Strubbe, Masoumeh Karvar, and Kristiaan Neyts. 2011. “Charging of Inverse Micelles in Nonpolar Liquids.” In The 85th ACS Colloid & Surface Science Symposium : Abstract Booklet, 141–142. American Chemical Society (ACS). Division of Coloid and Surface Science.
APA
Beunis, F., Strubbe, F., Karvar, M., & Neyts, K. (2011). Charging of inverse micelles in nonpolar liquids. The 85th ACS Colloid & Surface Science Symposium : abstract booklet (pp. 141–142). Presented at the 85th ACS Colloid and Surface Science Symposium, American Chemical Society (ACS). Division of Coloid and Surface Science.
Vancouver
1.
Beunis F, Strubbe F, Karvar M, Neyts K. Charging of inverse micelles in nonpolar liquids. The 85th ACS Colloid & Surface Science Symposium : abstract booklet. American Chemical Society (ACS). Division of Coloid and Surface Science; 2011. p. 141–2.
MLA
Beunis, Filip, Filip Strubbe, Masoumeh Karvar, et al. “Charging of Inverse Micelles in Nonpolar Liquids.” The 85th ACS Colloid & Surface Science Symposium : Abstract Booklet. American Chemical Society (ACS). Division of Coloid and Surface Science, 2011. 141–142. Print.
@inproceedings{1794759,
  abstract     = {The ability of surfactants in nonpolar liquids to stabilize charges on colloidal particles or in inverse micelles is increasingly important for applications such as electrophoretic displays and liquid toner printing. However, inverse micelle charging in nonpolar liquids is not completely understood.
This study considers both bulk mechanisms and processes at liquid/electrode interfaces as the origin of charged inverse micelles. We apply a voltage over a layer of n-dodecane with the surfactant polyisobutylene-succinimide, and measure the resulting current. Information about the generation of charges is obtained from the remaining current after the initially present charges have reached equilibrium.
At high voltages, disproportionation and comproportionation of inverse micelles explain the measured currents. At low voltages, the residual current is proportional with the electric field near the electrodes, which can not be explained by bulk generation. We interpret these results by assuming that inverse micelles exchange charge with an adsorbed layer of surfactant at the electrodes. These findings are relevant for technologies in which charge injection at the electrodes contributes to power consumption and hydrodynamic instabilities, such as microfluidics and electrophoretic displays.},
  articleno    = {abstract 321},
  author       = {Beunis, Filip and Strubbe, Filip and Karvar, Masoumeh and Neyts, Kristiaan},
  booktitle    = {The 85th ACS Colloid \& Surface Science Symposium : abstract booklet},
  language     = {eng},
  location     = {Montr{\'e}al, QU, Canada},
  pages        = {abstract 321:141--abstract 321:142},
  publisher    = {American Chemical Society (ACS). Division of Coloid and Surface Science},
  title        = {Charging of inverse micelles in nonpolar liquids},
  year         = {2011},
}