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Aerosol OT inverse micelles dynamics in nonpolar liquid

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Organization
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Center for nano- and biophotonics (NB-Photonics)
Abstract
Surfactants are often added to nonpolar colloidal suspensions for the stabilization and electrical charging of colloidal particles in devices such as electronic ink displays. The electrical behaviour of such devices is strongly influenced by the presence of charged inverse micelles, formed by excess surfactant that does not cover the particles. The presence of charged inverse micelles results in an increased conductivity of the solution, affecting both the energy consumption of the device and its switching characteristics. In this work, we use transient current measurements to investigate the electrical properties of suspensions of Aerosol OT (AOT) surfactant in dodecane, which is one of the commonly used surfactant for charging and dispersing particles. No particles are added, to isolate the effect of excess surfactant. The measured currents upon application of a voltage step are found to be exponentially decaying, and can be described by an analytical model based on an equivalent electric circuit. This behaviour of AOT solution can be physically understood, firstly by the high and fast generation rate of charged inverse micelles giving the suspension resistor like properties, and secondly by the build-up of layers of charged inverse micelles at both electrodes, acting as capacitors. The model explains the measurements over a large range of surfactant concentrations, applied voltages and device thicknesses.
Keywords
Electric current, Electrophoretic display, Electronic paper, Electrokinetics, interface, colloid, surfactant, nonpolar liquid, Charge transport, Inverse micelle

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Citation

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Chicago
Karvar, Masoumeh, Filip Strubbe, Filip Beunis, Roger Kemp, Ashley Smith, Mark Goulding, and Kristiaan Neyts. 2011. “Aerosol OT Inverse Micelles Dynamics in Nonpolar Liquid.” In The 85th ACS Colloid & Surface Science Symposium : Abstract Booklet, 207–207. American Chemical Society (ACS). Division of Coloid and Surface Science.
APA
Karvar, M., Strubbe, F., Beunis, F., Kemp, R., Smith, A., Goulding, M., & Neyts, K. (2011). Aerosol OT inverse micelles dynamics in nonpolar liquid. The 85th ACS Colloid & Surface Science Symposium : abstract booklet (pp. 207–207). Presented at the 85th ACS Colloid and Surface Science Symposium, American Chemical Society (ACS). Division of Coloid and Surface Science.
Vancouver
1.
Karvar M, Strubbe F, Beunis F, Kemp R, Smith A, Goulding M, et al. Aerosol OT inverse micelles dynamics in nonpolar liquid. The 85th ACS Colloid & Surface Science Symposium : abstract booklet. American Chemical Society (ACS). Division of Coloid and Surface Science; 2011. p. 207–207.
MLA
Karvar, Masoumeh, Filip Strubbe, Filip Beunis, et al. “Aerosol OT Inverse Micelles Dynamics in Nonpolar Liquid.” The 85th ACS Colloid & Surface Science Symposium : Abstract Booklet. American Chemical Society (ACS). Division of Coloid and Surface Science, 2011. 207–207. Print.
@inproceedings{1828862,
  abstract     = {Surfactants are often added to nonpolar colloidal suspensions for the stabilization and electrical charging of colloidal particles in devices such as electronic ink displays. The electrical behaviour of such devices is strongly influenced by the presence of charged inverse micelles, formed by excess surfactant that does not cover the particles. The presence of charged inverse micelles results in an increased conductivity of the solution, affecting both the energy consumption of the device and its switching characteristics. In this work, we use transient current measurements to investigate the electrical properties of suspensions of Aerosol OT (AOT) surfactant in dodecane, which is one of the commonly used surfactant for charging and dispersing particles. No particles are added, to isolate the effect of excess surfactant. The measured currents upon application of a voltage step are found to be exponentially decaying, and can be described by an analytical model based on an equivalent electric circuit. This behaviour of AOT solution can be physically understood, firstly by the high and fast generation rate of charged inverse micelles giving the suspension resistor like properties, and secondly by the build-up of layers of charged inverse micelles at both electrodes, acting as capacitors. The model explains the measurements over a large range of surfactant concentrations, applied voltages and device thicknesses.},
  articleno    = {abstract 479},
  author       = {Karvar, Masoumeh and Strubbe, Filip and Beunis, Filip and Kemp, Roger and Smith, Ashley and Goulding, Mark and Neyts, Kristiaan},
  booktitle    = {The 85th ACS Colloid \& Surface Science Symposium : abstract booklet},
  keyword      = {Electric current,Electrophoretic display,Electronic paper,Electrokinetics,interface,colloid,surfactant,nonpolar liquid,Charge transport,Inverse micelle},
  language     = {eng},
  location     = {Montr{\'e}al, QU, Canada},
  pages        = {abstract 479:207--abstract 479:207},
  publisher    = {American Chemical Society (ACS). Division of Coloid and Surface Science},
  title        = {Aerosol OT inverse micelles dynamics in nonpolar liquid},
  year         = {2011},
}