Power law behavior of conductivity in the AOT/dichloroethane system

Heffner, William R.; Marcus, Matthew A.

doi:10.1016/0021-9797(88)90198-1

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…The charging agents usually form inverse micelle structures, trapping all polar impurities or residues from the non-aqueous oil phase into the center cores. Commonly used charging agents include calcium diisopropylsalicylate, 25 tetraisoamylammonium picrate, 25 polyisobutylene succinimide, OLOA 1200, [26][27][28] di-(2-ethylhexyl) sodium sulfosuccinate (AOT), [29][30][31] octyl phenol ethoxylate (Triton X-100), 32 phosphatidylcholine (lecithin), 33 sorbitan oleate (Span 80), 34 etc. The molecular structures of these charging agents are shown in Fig.…”

Section: Charging Agents and Dispersantsmentioning

confidence: 99%

Exploring the charging mechanisms in non-aqueous multiphase surfactant solutions, emulsions and colloidal systems via conductivity behaviors predicted with eyring's rate process theory

Hao

2016

Phys. Chem. Chem. Phys.

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The common charging agents and charging mechanisms in non-aqueous multiphase systems available in the literature are analyzed, and the conductivity equations derived on the basis of the charging mechanisms with the Eyring's rate process theory are compared with experimental observations. The popular charging mechanisms in non-aqueous systems, such as the ion preferential absorption, ion pair dissociation, and micelle disproportionation/fluctuation models, are found to be incapable of explaining all experimental evidences. Particularly, the ion pair dissociation and micelle disproportionation/fluctuation models apparently suffer a major drawback: how charges are separated and most importantly how charging entities are stabilized in non-aqueous systems, are not adequately addressed; in low dielectric constant non-aqueous media separated ions tend to bind together rather than stay separately. A new charging mechanism incorporating an electric field internally available or externally applied into the charging process is proposed to explain charge separations and stabilizations. The conductivity equations derived on the basis of this new mechanism predict that conductivity should linearly increase with both the electric field and the concentrations of inverse micelles in very low concentration regions, which is consistent with experimental evidences.

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Section: Charging Agents and Dispersantsmentioning

confidence: 99%

Exploring the charging mechanisms in non-aqueous multiphase surfactant solutions, emulsions and colloidal systems via conductivity behaviors predicted with eyring's rate process theory

Hao

2016

Phys. Chem. Chem. Phys.

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“…The formation of inverse micelles in nonpolar media has been investigated by a number of researchers. − However, the surfactants studied have generally been well-characterized surfactants that are known to form micelles. Previous techniques used to investigate the properties of micelle-forming systems include conductivity measurements, − viscometry, − small-angle neutron scattering, , and light scattering. ,− Ideal surfactants such as Aerosol OT were used in these cases. Fluorescence spectroscopy using a probe species, such as a dye, was also used to study the core of inverse micelles. ,,− However, the exact nature of the influence of the dye molecule on the structure of the micelles leaves a question over this “disruptive” technique .…”

Section: Introductionmentioning

confidence: 99%

A Study of the Micellization of Zirconyl 2-Ethyl Hexanoate via Small-Angle Neutron and X-ray Scattering

Keir

Watson

2000

Langmuir

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We report the first investigation of zirconyl 2-ethyl hexanoate micelles in decane using small-angle neutron and X-ray scattering. Our results show that the micelles have a spherical shell structure consisting of an inner core region with a radius of 6.3 Å that is surrounded by a shell 5.3 Å thick incorporating the surfactant chain segments. From the contrast variation experiment, we calculated there were 33 surfactant molecules/micelle. Finally, our small-angle neutron scattering experiments performed at 80 °C showed there was no change in the shape or size of the micelles at the higher temperature.

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