Swollen Micelles Plus Hydrophobically Modified Hydrosoluble Polymers in Aqueous Solutions:  Decoration versus Bridging. A Small Angle Neutron Scattering Study

Filali, M.; Aznar, R.; Svenson, Mattias; Porte, G.; Appell, J.

doi:10.1021/jp990980d

Cited by 62 publications

(109 citation statements)

References 35 publications

(65 reference statements)

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“…Mora and Manna [Mora and Manna (2009, 2010] revisited both theoretically and experimentally the Saffman-Taylor instability for a model viscoelastic fluid, i.e. a upper-convected Maxwell fluid, a versatile experimental realization of which consisting a transient network of oil in water microemulsion droplets droplets reversibly linked by telechelic polymers [Filali et al (1999)]. They prove [Mora and Manna (2010)] that a unique dimensionless parameterτ = b 2 (−∇P) 3/2 G 0 Γ 1/2 (b is the thickness of there Hele-Shaw cell, ∇P is the applied pressure gradient, Γ , the surface tension of the network and G 0 is the zero shear modulus), controls all elastic effects and particularly, the fracture transition.…”

Section: Fractures In Hele-shaw Cellsmentioning

confidence: 99%

“…Tabuteau et al have measured σ 1 using pendant drop experiments, as introduced in section 3.3.2. The authors used a model system made of oil-in-water microemulsion droplets connected to each other by telechelic polymers (see Figure 19) [Filali et al (1999)] at different concentrations in order to vary both the relaxation time and the elastic modulus. In pendant drop experiments, the increase in stress with time is large enough to neglect the probability of breaking due to a subcritical fracture stress.…”

Section: Thermally Activated Crack Nucleation Model (Tac Model)mentioning

confidence: 99%

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Fractures in complex fluids: the case of transient networks

Ligoure

Mora

2013

Rheol Acta

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We present a comprehensive review of the current state of fracture phenomena in transient networks, a wide class of viscoelastic fluids. We will first define what is a fracture in a complex fluid, and recall the main structural and rheological properties of transient networks. Secondly, we review experimental reports on fractures of transient networks in several configurations: shear-induced fractures, fractures in Hele-Shaw cells and fracture in extensional geometries (filament stretching rheometry and pendant drop experiments), including fracture propagation. The tentative extension of the concepts of brittleness and ductility to the fracture mechanisms in transient networks is also discussed. Finally, the different and apparently contradictory theoretical approaches developed to interpret fracture nucleation will be addressed and confronted to experimental results. Rationalized criteria to discriminate the relevance of these different models will be proposed.

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Section: Fractures In Hele-shaw Cellsmentioning

confidence: 99%

Section: Thermally Activated Crack Nucleation Model (Tac Model)mentioning

confidence: 99%

Fractures in complex fluids: the case of transient networks

Ligoure

Mora

2013

Rheol Acta

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“…1). 23 The volume fraction in oil droplets is fixed to f ¼ 10%. The droplets are swollen with decane and dispersed in 0.2 M NaCl brine.…”

Section: Introductionmentioning

confidence: 99%

Propagation of a brittle fracture in a viscoelastic fluid

et al. 2011

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During pendant drop experiments, a model physical gel made from oil in water microemulsion droplets reversibly linked together by triblock copolymers, exhibit a very peculiar filament rupture corresponding to highly brittle failure of a viscoelastic fluid. The fracture propagation has been tracked by high speed videomicroscopy. Analysis of the time evolution of the fracture profile shows that the fracture is purely elastic and reversible without any significant bulk and interfacial viscous dissipation. However, since the elastic moduli of such complex fluids are low, hyper elastic corrections have to be taken into account for a quantitative analysis of the fracture profile. This brittle behavior is well explained by a hyperelastic generalization of the viscoelastic trumpet model of de Gennes. The velocity of the fracture's propagation is measured and compared to the predictions of a simple microscopic model.

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“…The effect of the bridging attraction onto the phase behavior of solutions ____________________________________________________________________ 5 06/01 Paper "Robust phase behaviour..." Filali et al of associating polymers is further analyzed theoretically in 13 . Experimentally this phase separation has been observed in binary systems 14 as well as in ternary systems [4][5][6][7] . We have discussed at length 6 this effective interaction per se and as the driving force for the phase separation.…”

Section: Introductionmentioning

confidence: 99%

Robust Phase Behavior of Model Transient Networks

et al. 2001

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In order to study the viscoelastic properties of certain complex fluids which are described in terms of a multiconnected transient network we have developed a convenient model system composed of microemulsion droplets linked by telechelic polymers. The phase behavior of such systems has two characteristic features: a large monophasic region which consists of two sub-regions (a fluid sol phase and a viscoelastic gel phase) separated by a percolation line and a two phase region at low volume fraction with separation into a dilute sol phase and a concentrated gel phase. From the plausible origin of these features we expect them to be very similar in different systems. We describe here the phase behavior of four different systems we prepared in order to vary the time scale of the dynamical response of the transient network; they consist of the combination of two oil(decane) in water microemulsions differing by the stabilizing surfactant monolayer (Cetyl pyridinium chloride/ octanol or TX100/TX35) and of two telechelic polymers which are end-grafted poly (ethylene oxide) chains, differing by the end-grafted hydrophobic aliphatic chains (C 12 H 25 or C 18 H 37 ). We first summarize the characterization of the structure of the four systems by small angle neutron scattering: the size of the microemulsion droplets is found to be constant in a given system upon addition of a telechelic polymer.In the CPCl systems we find a mean radius of the microemulsion droplets = 62± 1Å and a very narrow size distribution and in the TX systems we find a mean radius = 84± 2Å and a somewhat larger size ____________________________________________________________________ 2 06/01 Paper "Robust phase behaviour..." Filali et al distribution. We can then calculate precisely the number of polymers per microemulsion droplet and compare the phase behavior of the four systems in consistent units. As expected we find very similar phase behavior in the four systems.

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Swollen Micelles Plus Hydrophobically Modified Hydrosoluble Polymers in Aqueous Solutions: Decoration versus Bridging. A Small Angle Neutron Scattering Study

Cited by 62 publications

References 35 publications

Fractures in complex fluids: the case of transient networks

Fractures in complex fluids: the case of transient networks

Propagation of a brittle fracture in a viscoelastic fluid

Robust Phase Behavior of Model Transient Networks

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