Dielectric Study of Water-in-Hexadecane Microemulsions. A Preliminary Report

Clausse, Marc; Sheppard, R J; Boned, Christian; Essex, C G

doi:10.1016/b978-0-12-404502-6.50024-x

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…Faisant suite ~i des travaux ant~rieurs [8][9][10][11], une &ude r~cente a conduit, k &ant fix~, fi proposer une classification de syst~mes quaternaires eau/surfactant ionique/alcool/hydrocarbure en deux categories distinctes, ~i partir de l'analyse compar~e des propri&~s ~lectriques et de la configuration du domaine d'existence des phases Winsor IV.…”

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Etude de phases quaternaires Winsor IV. Diagrammes de phases et propriétés electriques

Heil

Clausse

Peyrelasse

et al. 1982

Colloid & Polymer Sci

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A comparative study of phase diagram features and electrical properties of Winsor IV phases (so-called microemulsions) led to define two types of quaternary systems involving water, a hydrocarbon, and an ionic surfactant/alcohol combination defined by k, the surfactant/alcohol mass ratio. Systems of the first type exhibit a Winsor IV domain consisting of two disjointed areas corresponding to water-in-oil (w/o) and oilin-water (o/w) monophasic fluid transparent isotropic media. The w/o and o/w areas are separated by a composition zone over which exist viscous turbid long-range organized structures related to the o/w ~ w/o phase inversion mechanism. In that case, over the w/o area, the low frequency electrical conductivity and permittivity undergo non-monotonous changes as the composition varies. From conductivity maxima and minima, it is possible to define in the general case two lines F~ and F 2 separating three adjacent sulS~areas to which can be assigned compositions representing pre-micellar entities, inverted swollen spherical micelles and micelles clusters. For systems of the second type, the w/o and o/w sub-areas merge so as to form a unique monophasic area, which implies that the w/o ~-+ o/w phase inversion occurs through a progressive diffuse mechanism. In that case the conductivity exhibits much higher values than in the preceding situation, and its variations with composition allow to define two lines C d and C m partitioning the Winsor IV domain into three adjacent areas. Above Cd, that is for low and medium water contents, the conductivity variations with water content follow equations derived from the Percolation and Effective Medium theories, which indicates that the w/o swollen spherical micelles are submitted to attractive interactions. Below C~,, i.e. in the water rich region, the conductivity decrease with water content results from the progressive dilution of the external aqueous phase of the o/w Winsor IV media. Between (7 d and C,,, the Winsor IV media exhibit an anomalous conductive behaviour which suggests that they are neither w/o nor o/w systems. This region can be considered as the diffuse phase inversion zone over which the systems are in a hybrid state that could be depicted tentatively as resulting from the formation of equilibrium bicontinuous structures.

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Etude de phases quaternaires Winsor IV. Diagrammes de phases et propriétés electriques

Heil

Clausse

Peyrelasse

et al. 1982

Colloid & Polymer Sci

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“…L'6tude de syst~mes du type micro6mulsion <<eau-danshuile>> montre qu'ils prdsentent, outre une conduction d'ensemble, un ph6nom~ne de relaxation di61ectrique de type Cole-Cole, (28), (29), (30), (31), ce qui est en accord qualitatif avec les rdsultats de l'analyse rapport6s en 4.1. La permittivit4 complexe de ces systhmes est donc repr4sentable par la fotmule [18].…”

Section: Application Au Cas De Systbmes Du Type ((Micro6mulsiom)unclassified

Analyse numérique de la formule de Hanaï. Essai d'application au cas des propriétés dielectriques de microémulsions

Boned

Peyrelasse

Clausse

et al. 1979

Colloid Polymer Sci

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“…The existence of this kind of structural change has been predicted on the basis of many different measurements, such as x-ray (Schulman and Riley 1948), optical properties (Graciaa et a1 1976, Attwood et a1 1974b, dielectric properties (Clausse et al 1976, Clausse 1977and Senatra and Giubilaro 1978a, viscosity (Attwood 1974a) and NMR (Shah andHamlin 1971 andPacker andRees 1972). Recently, rather direct evidence has been obtained from light scattering experiments (Ballaro' et a1 1978).…”

Section: Introductionmentioning

confidence: 98%

Imprint Model Based on Thermionic Electron Emission Under Local Fields in Ferroelectric Thin Films

Nagasawa¹,

Nozawa²

1999

Jpn. J. Appl. Phys.

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Dielectric Study of Water-in-Hexadecane Microemulsions. A Preliminary Report

Cited by 15 publications

References 26 publications

Etude de phases quaternaires Winsor IV. Diagrammes de phases et propriétés electriques

Etude de phases quaternaires Winsor IV. Diagrammes de phases et propriétés electriques

Analyse numérique de la formule de Hanaï. Essai d'application au cas des propriétés dielectriques de microémulsions

Imprint Model Based on Thermionic Electron Emission Under Local Fields in Ferroelectric Thin Films

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