Sponge phases in surfactant solutions

Roux, D.; Coulon, Christian; Cates, M. E.

doi:10.1021/j100190a017

Cited by 215 publications

(208 citation statements)

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“…Depending on the range of concentrations, one can observe different structures: for instance, long cylinders of some microns long (wormlike micelles) or infinite surfactant bilayers (membranes). In the latter case, because of the interactions, the membranes can form periodic stacks, referred to as lamellar phases and noted L α , or randomly connected continuous structures, called sponge phases and noted L 3 [30,31]. In a lamellar phase, the smectic period d, i.e.…”

Section: Global Rheology Of the Onion Texture Near The Layering Tmentioning

confidence: 99%

Shear banding in a lyotropic lamellar phase. I. Time-averaged velocity profiles

2003

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Using velocity profile measurements based on dynamic light scattering and coupled to structural and rheological measurements in a Couette cell, we present evidences for a shear-banding scenario in the shear flow of the onion texture of a lyotropic lamellar phase. Time-averaged measurements clearly show the presence of structural shear-banding in the vicinity of a shear-induced transition, associated to the nucleation and growth of a highly sheared band in the flow. Our experiments also reveal the presence of slip at the walls of the Couette cell. Using a simple mechanical approach, we demonstrate that our data confirms the classical assumption of the shear-banding picture, in which the interface between bands lies at a given stress σ ⋆ . We also outline the presence of large temporal fluctuations of the flow field, which are the subject of the second part of this paper [Salmon et al., submitted to Phys. Rev. E].

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Section: Global Rheology Of the Onion Texture Near The Layering Tmentioning

confidence: 99%

Shear banding in a lyotropic lamellar phase. I. Time-averaged velocity profiles

2003

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“…Since the coordination number in the fluid is density dependent, we make the approximation: 6) where the fluid correlation function g(r) is taken from the Percus-Yevick solution for hard spheres [31]. The mean field configurational energy is then…”

Section: A Explicit Model Calculationsmentioning

confidence: 99%

Liquid-vapor phase behavior of a symmetrical binary fluid mixture

1998

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Using Monte-Carlo simulation and mean field calculations, we study the liquid-vapour phase diagram of a square well binary fluid mixture as a function of a parameter δ measuring the relative strength of interactions between particles of dissimilar and similar species. The results reveal a rich variety of liquid-vapour coexistence behaviour as δ is tuned. Specifically, we uncover critical end point behaviour, a triple point involving a vapour and two liquids of different density, and tricritical behaviour. For a certain range of δ, the mean field calculations also predict a 'hidden' (metastable) liquid-vapour binodal.

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“…However, the spatial correlation is not sustained but has finite extent, because we do not observe any Bragg-singularity but only one broad correlation peak. Certain soft condensed systems, such as bicontinuous microemulsions [21,22] and bilayer membranes, [23][24][25] when being in the so-called L 3 structural phase, show this very particular feature in the scattering spectra. This may indicate that the structure of the amorphous and crystalline phase in the present polymer membranes is bicontinuous and randomly connected.…”

Section: Discussion Of Base and Grafted Filmsmentioning

confidence: 98%

Correlation between Morphology, Water Uptake, and Proton Conductivity in Radiation Grafted Proton Exchange Membranes

et al. 2010

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A small-angle neutron scattering (SANS) investigation of saturated aqueous proton exchange membranes is presented. Our membranes were synthesized by radiation-induced grafting of poly(ethylene-alt-tetrafluoroethylene) (ETFE) with styrene in the presence of crosslinker (divinylbenzene, DVB) and the polystyrene was sulfonated subsequently. The contrast variation method was used to understand the relationship between morphology, water uptake, and proton conductivity. We find that the membranes are separated into two phases, mostly following the morphology already defined in the semi-crystalline ETFE base film. The amorphous phase hosts the water and swells upon hydration, swelling being inversely proportional to the degree of crosslinking. Proton conductivity and volumetric fraction of water are related by a power law, indicating a percolated and most likely random network of finely dispersed aqueous pores in the hydrophilic domains.

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Sponge phases in surfactant solutions

Cited by 215 publications

References 0 publications

Shear banding in a lyotropic lamellar phase. I. Time-averaged velocity profiles

Shear banding in a lyotropic lamellar phase. I. Time-averaged velocity profiles

Liquid-vapor phase behavior of a symmetrical binary fluid mixture

Correlation between Morphology, Water Uptake, and Proton Conductivity in Radiation Grafted Proton Exchange Membranes

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