Effect of particle and surfactant acid–base properties on charging of colloids in apolar media

Poovarodom, Saran; Berg, John C.

doi:10.1016/j.jcis.2010.03.012

Cited by 96 publications

(158 citation statements)

References 44 publications

(96 reference statements)

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“…Assuming the zeta potential of the electrodes is comparable to or smaller than the thermal voltage k B T/e, the measured double-layer capacitance can be used to infer the Debye length k D from Eq. (11) and in turn the ionic strength n 0 can be inferred from Eq. (10).…”

Section: Discussionmentioning

confidence: 99%

“…If f is everywhere small compared to the thermal voltage k B T/e (as we have assumed), then Eq. (11) continues to predict a single value for C dl . But if f is not small, then Eq.…”

Section: The Cpe Modelmentioning

confidence: 99%

“…The most commonly measured property is conductivity which depends both of the number of charge carriers as well as their mobility (size). Many past studies of charge formation have relied on dynamic light scattering [10,11] to measure the carrier mobility. Having a value for carrier mobility, measurements of conductivity can be used to infer the concentration of carriers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Use of electrochemical impedance spectroscopy to determine double-layer capacitance in doped nonpolar liquids

Yezer

Khair

Sides

et al. 2015

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 99%

“…If f is everywhere small compared to the thermal voltage k B T/e (as we have assumed), then Eq. (11) continues to predict a single value for C dl . But if f is not small, then Eq.…”

Section: The Cpe Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Use of electrochemical impedance spectroscopy to determine double-layer capacitance in doped nonpolar liquids

Yezer

Khair

Sides

et al. 2015

Journal of Colloid and Interface Science

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“…This last system is of interest for studying the effect of the formation of ion-pair at a constant chemical potential, as the conductivity of micelles as function of ionic surfactant can be measured: it has been found that the conductivity is linearly dependent on ionic surfactant solution in a non-polar medium. [24][25][26] One can see from Fig. 2 that the curve is somewhat convex.…”

Section: B Case IImentioning

confidence: 99%

Application of classical thermodynamics to the conductivity in non-polar media

Gourdin-Bertin

Chassagne

2016

The Journal of Chemical Physics

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Articles you may be interested inElectrical conductivity in non-polar media is a subject which recently regained interest. If most of experiments and theoretical developments were done more than 50 years ago, new experiments and theories have been recently published. As the electrical conductivity describes, at low field, the equilibrium state of a system, it is natural to apply theories based on equilibrium thermodynamics. In this article, well-established classical thermodynamics and solvations models are applied to recently published data. This enables to get a new insight in intriguing phenomena, such as the linear dependence of the conductivity on the concentration of ionic surfactant and the evaluation of conductivity for the mixture of two miscible fluids, such as alcohol and alcane, which have very different conductivities. Published by AIP Publishing. [http://dx

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“…11−13,27,28 A small fraction (10 −5 aerosol OT 11,13 and 0.1 polyisobutylene succinimide 24,29 (PIBS)) of the inverse micelles is charged as a result of a disproportionation/ comproportionation mechanism, 11,12,14,15,24,28 in which two uncharged inverse micelles exchange a charge and become a positively and a negatively charged inverse micelle and vice versa. Charged inverse micelles (CIMs) play an important role in charging and charge stabilization in nonpolar media.…”

Section: ■ Introductionmentioning

confidence: 99%

Different Types of Charged-Inverse Micelles in Nonpolar Media

et al. 2016

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Over the last few years, the electrodynamics of charged inverse micelles (CIMs) in nonpolar liquids and the generation mechanism and properties of newly generated CIMs have been studied extensively for the model system of polyisobutylene succinimide in dodecane. However, the newly generated CIMs, which accumulate at the electrodes when a continuous voltage is applied, behave differently compared to the regular CIMs present in equilibrium in the absence of a field. In this work, we use transient current measurements to investigate the behavior of the newly generated CIMs when the field is reduced to zero or reversed. We demonstrate that the newly generated CIMs do not participate in the diffuse double layer near the electrode formed by the regular CIMs but form an interface layer at the electrode surface. A fraction of the newly generated negative CIMs can be released from this interface layer when the field there becomes zero. The findings of this study provide a better understanding of fundamental processes in nonpolar liquids and are relevant for applications such as electronic ink displays and liquid toner printing. 23−26 have been used to study the mechanism of surfactant-mediated charging and charge stabilization in nonpolar media. From these studies, it has been concluded that charges in nonpolar surfactant systems exist in the form of inverse micelles that are formed above a certain surfactant concentration known as the critical micelle concentration. ■ INTRODUCTION11−13,27,28 A small fraction (10 −5 aerosol OT 11,13 and 0.1 polyisobutylene succinimide 24,29 (PIBS)) of the inverse micelles is charged as a result of a disproportionation/ comproportionation mechanism, 11,12,14,15,24,28 in which two uncharged inverse micelles exchange a charge and become a positively and a negatively charged inverse micelle and vice versa. Charged inverse micelles (CIMs) play an important role in charging and charge stabilization in nonpolar media. 11−15,30−32 Electrophoretic displays are based on the displacement of charged pigment particles between two electrodes in response to an applied voltage. 5,7,25 In these systems, surfactant is often added to charge and stabilize the pigment particles. 16,33,34 However, only a small fraction of surfactant molecules is adsorbed at the particle surfaces and other interfaces. Because of the presence of free CIMs, the nonpolar medium becomes more conductive, affecting the electric field and the switching characteristics of charged pigment particles. 21 Controlling the trajectory of particles in conductive media is challenging because of electrohydrodynamic flow, 7,29 which causes particle clustering 7 and pattern formation 35−37 at the electrodes, resulting in image degradation, increased power consumption, and reduced lifetimes of electrophoretic devices. 7 Many effects of charged inverse micelles can be studied without the presence of colloidal particles. 29,33,38 The electrical behavior of these nonpolar systems with surfactant is governed by the drift, diffusion, an...

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Effect of particle and surfactant acid–base properties on charging of colloids in apolar media

Cited by 96 publications

References 44 publications

Use of electrochemical impedance spectroscopy to determine double-layer capacitance in doped nonpolar liquids

Use of electrochemical impedance spectroscopy to determine double-layer capacitance in doped nonpolar liquids

Application of classical thermodynamics to the conductivity in non-polar media

Different Types of Charged-Inverse Micelles in Nonpolar Media

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