Salt partitioning in Winsor Type II systems

Biais, J.; Barthe, Marie-France; Bourrel, M.; Clin, B.; Lalanne, P.

doi:10.1016/0021-9797(86)90339-5

Cited by 14 publications

(11 citation statements)

References 28 publications

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“…Biais et al (10) used a biquadratic equation to solve the [NaCl] in the excess water phase. Here, h and k i has been determined by fit of experimental data.…”

Section: Models For Nacl Partitioningmentioning

confidence: 99%

“…Two models have been used to make NaCl ϩ water a valid pseudo-component (9,10). In the model by Biais et al (10) the starting assumption is to treat the equilibrium of the phases as a Donnan equilibrium where the surfactant determines the membrane pseudo-phase.…”

Section: Models For Nacl Partitioningmentioning

confidence: 99%

“…Both surfactants have been anionic with Na ϩ as counterion for the surfactant. The partitioning of NaCl into the excess water phase has been compared with results obtained form the two empirical models of Biais et al (10) and Robertson (9).…”

Section: Introductionmentioning

confidence: 99%

“…The influence on the systems' phase behavior can be large (12), and this indicates that treating (salt ϩ water) as pseudo-component brine is not correct unless further modifications are made. Biais et al (10) and Robertson (9) have developed models to make (NaCl ϩ water) a valid pseudocomponent. With redefinition of the pseudo-phases, the phase behavior of the systems is reflected in a ternary diagram.…”

Section: Introductionmentioning

confidence: 99%

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Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Aarra

Høiland

Skauge

1999

Journal of Colloid and Interface Science

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“…Biais et al (10) used a biquadratic equation to solve the [NaCl] in the excess water phase. Here, h and k i has been determined by fit of experimental data.…”

Section: Models For Nacl Partitioningmentioning

confidence: 99%

Section: Models For Nacl Partitioningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Aarra

Høiland

Skauge

1999

Journal of Colloid and Interface Science

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“…The dependence of as on the salt concentration is neglegible in the concentration range studied here [17] and a constant SDS molecular area of 0.94 nm2 was used [20]. We moreover introduced an essentially salt-free volume equal to Aes, es= 0.2 nm being the thickness of the Stern layer [21,22]. The limiting value re,ion = 2cic-1 corresponding to a very high charge density (eq.…”

mentioning

confidence: 99%

Evidence for Enhanced Electrostatic Interactions in Lamellar Monolayer Systems

Kegel¹,

Lekkerkerker²

1994

Europhys. Lett.

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Electrostatics, magnetostatics. PACS. 61.30E Experimental determinations of smectic, nematic, cholesteric, and lyotropic structures.Abstract. The interlamellar spacing as a function of the surfactant concentration in a lamellar monolayer system containing a ionic surfactant was studied. It is demonstrated that even at large interlamellar spacings (6-14 nm) relative to the Debye lengths (order 0.7 nm), electrostatic repulsion still plays a significant role which is attributed to a coupling with monolayer undulations.Systems consisting of water, oil and one or more amphiphiles may order themselves into a stack of undulating monolayers or bilayers. Over the last decade it has become clear that undulations may strongly renormalize direct interactions arising from intermolecular forces [1][2][3][4]. Thermal undulations are predicted to lead to a much slower decay of the electrostatic repulsion between charged bilayer membranes than expected from classical double-layer theory [5][6][7][8]. Supporting experimental evidence for such an effect can be obtained from the distance dependence of the interaction between charged membranes [9]. Moreover, Odijk [10] deduced from his self-consistent theory of undulation-enhanced interactions a melting rule for a lamellar phase coexisting with an isotropic phase which is in semi-quantitative agreement with experimental results of Dubois and Zemb [11]. The aim of the work presented here is to provide experimental evidence for enhanced electrostatic repulsion in single-phase fluctuating monolayer systems in which the interlamellar spacing is measured as a function of the monolayer volume fraction. The effective salt concentration in these systems is shown to depend upon the total area of the charged monolayer at the oil-brine interface. We present a simple method to control the effective salt concentration independent of the monolayer volume fraction and show that even at relatively high effective salt concentrations (up to 0.3 M), electrostatic repulsion still plays a significant role. We first summarize some theoretical aspects of charged undulating membrane systems that are relevant for the work presented here. In a fluctuating membrane system thermal undulations tend to decrease the projected area while the total area A is conserved. The first-order correction to the projected area Aproi of a membrane caused by thermal (*) Present address:

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A NormalizedHydrophilic–LipophilicDeviation ExpressionHLD_NIs Necessary to Avoid Confusion Close to the Optimum Formulation ofSurfactant‐Oil–WaterSystems

Salager

2021

J Surfact & Detergents

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The physicochemical conditions to attain a minimum interfacial tension between oil and water were intensively studied in the 1970s when the chemical‐enhanced oil recovery became an emergency with the increase in petroleum cost. Correlations between the formulation variables (salinity, oil nature, surfactant and co‐surfactant nature, temperature, and pressure) required to attain a minimum interfacial tension or a three‐phase behavior, so‐called optimum formulation, were related to the chemical potential concept in the late 1970s. They were then transformed in a generalized hydrophilic–lipophilic deviation (HLD) expression in 2000. Some confusion in the ranking and classification of the surfactant parameters with different scales has occurred in recent years. The aim here is to propose a normalized HLDN expression with the alkane carbon number (ACN) variable scale to clear up the current misunderstanding in the use of different HLD expressions. The use of a single HLDN expression for all systems improves the prediction of formulation effects, but does not eliminate the limitations due to the partitioning of species in surfactant mixtures.

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Salt partitioning in Winsor Type II systems

Cited by 14 publications

References 28 publications

Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Evidence for Enhanced Electrostatic Interactions in Lamellar Monolayer Systems

A NormalizedHydrophilic–LipophilicDeviation ExpressionHLD_NIs Necessary to Avoid Confusion Close to the Optimum Formulation ofSurfactant‐Oil–WaterSystems

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Salt partitioning in Winsor Type II systems

Cited by 14 publications

References 28 publications

Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Phase Behavior and Salt Partitioning in Two- and Three-Phase Anionic Surfactant Microemulsion Systems: Part II, Partitioning of Salt

Evidence for Enhanced Electrostatic Interactions in Lamellar Monolayer Systems

A NormalizedHydrophilic–LipophilicDeviation ExpressionHLDNIs Necessary to Avoid Confusion Close to the Optimum Formulation ofSurfactant‐Oil–WaterSystems

Contact Info

Product

Resources

About

A NormalizedHydrophilic–LipophilicDeviation ExpressionHLD_NIs Necessary to Avoid Confusion Close to the Optimum Formulation ofSurfactant‐Oil–WaterSystems