Influence of interfacial rheology on foam and emulsion properties

Langévin, D.

doi:10.1016/s0001-8686(00)00045-2

Cited by 452 publications

(316 citation statements)

References 38 publications

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“…For this reason, the Gibbs elasticity has been studied extensively. [59][60][61][62][63][64][65][66] Figure 9 shows the change of the Gibbs elasticity calculated using the data shown in Figure 4a as a function of the dilatational strain where A is the area occupied by each surfactant and A 0 is the reference area corresponding to the most probable surface concentration. Our results indicate that a common feature of the three surfactants is that the Gibbs elasticity decays with increasing the dilatational strain.…”

Section: Gibbs Elasticity and Mechanical Shear Deformationmentioning

confidence: 99%

Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations

2006

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We used molecular dynamics (MD) simulations to investigate the structures and properties of Newton black films (NBF) for several surfactants: sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (C16TAB), and surfactin using film thicknesses up to 10 nm. By calculating the interface formation energy for various packing conditions on the surface pressure-area isotherm, we found that the most probable surface concentration is ∼42 Å 2 /molecule for SDS and C16TAB and ∼170 Å 2 /molecule for surfactin. We then used this most probable concentration of each surfactant to simulate NBF with various film thicknesses. From analyzing the disjoining pressure-film thickness isotherms with the density profiles and the solvation coordination number, we found that the increase of the disjoining pressure during the film thinning was coupled with the change in inner structure of the NBF (i.e., density profile and the solvation of ionic entities). In the range of film thicknesses less than ∼30 Å, the disjoining pressures for the SDS and C16TAB were found to be larger than that of the surfactin. We predicted the Gibbs elasticity (175 dyn/cm for surfactin; 109 dyn/cm for C16TAB; 38 dyn/cm for SDS) required to assess the stability of NBF against surface concentration fluctuations, and the shear modulus (6.5 GPa for the surfactin; 6.1 GPa for the C16TAB; 3.5 GPa for the SDS) and the yield stress (∼0.8 GPa for surfactin; ∼0.8 GPa for C16TAB; ∼0.4 GPa for the SDS) to assess the mechanical stability against the externally imposed mechanical perturbation.

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Section: Gibbs Elasticity and Mechanical Shear Deformationmentioning

confidence: 99%

Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations

2006

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“…Due to temperature increases, thermal thinning and foam film thickening occur, which quickly drains liquid in the lamellas [40]. At elevated temperatures, foam lamella drainage and bubble coalescence are fast, which causes a significant drop in foam viscosity [5,[40][41][42]. Besides this, high fluctuations in temperature cause holes in the lamella because the foam undergoes high lamella rupture and bubble coalescence occurs [42].…”

Section: Introductionmentioning

confidence: 99%

Empirical Modeling of the Viscosity of Supercritical Carbon Dioxide Foam Fracturing Fluid under Different Downhole Conditions

et al. 2018

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High-quality supercritical CO 2 (sCO 2 ) foam as a fracturing fluid is considered ideal for fracturing shale gas reservoirs. The apparent viscosity of the fracturing fluid holds an important role and governs the efficiency of the fracturing process. In this study, the viscosity of sCO 2 foam and its empirical correlations are presented as a function of temperature, pressure, and shear rate. A series of experiments were performed to investigate the effect of temperature, pressure, and shear rate on the apparent viscosity of sCO 2 foam generated by a widely used mixed surfactant system. An advanced high pressure, high temperature (HPHT) foam rheometer was used to measure the apparent viscosity of the foam over a wide range of reservoir temperatures (40-120 • C), pressures (1000-2500 psi), and shear rates (10-500 s −1 ). A well-known power law model was modified to accommodate the individual and combined effect of temperature, pressure, and shear rate on the apparent viscosity of the foam. Flow indices of the power law were found to be a function of temperature, pressure, and shear rate. Nonlinear regression was also performed on the foam apparent viscosity data to develop these correlations. The newly developed correlations provide an accurate prediction of the foam's apparent viscosity under different fracturing conditions. These correlations can be helpful for evaluating foam-fracturing efficiency by incorporating them into a fracturing simulator.

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“…En effet, pour obtenir une grande quantite de mousse, il faut que les stabilisants puissent migrer rapidement et facilement a l'interface. Par ailleurs, la stabilisation de la mousse sur le long terme necessite que ces stabilisants s'organisent de façon a creer a la surface des bulles une couche insoluble elastique permettant de limiter a la fois le drainage, le mûrissement et la coalescence (Langevin, 2000). Or, le corollaire d'une grande elasticite de l'interface est generalement la formation de barrieres fortes pour l'adsorption et la desorption.…”

Section: Dispersion Et Agregation Des Acides Gras a Longues Chaînes Eunclassified

Les acides gras hydroxylés : agro-tensioactifs aux propriétés moussantes originales

Fameau

Cousin

Saint‐Jalmes

et al. 2013

OCL

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Hydroxylated fatty acids: Agro-based surfactants with original foaming properties Surfactants, which are molecules bearing a hydrophobic part and a hydrophilic part, are widely used in many daily life products (detergent, cosmetic, pharmaceutical. . .) because of their foaming properties. Indeed, they spontaneously go to the interface between air and water, which stabilizes the thin water films surrounding air bubbles to obtain foams. Currently, since the most used surfactants come from derivatives from petroleum-based products, their replacement by biomolecules is a major issue in the current context of sustainable development and green chemistry. This could promote the use of molecules from agricultural resources, such as hydroxyl fatty acids that can be extracted from oil or from the tegument of fruits and vegetables, as new agro-based surfactants. Here, we present recent research on the surfactant properties of the 12-hydroxy stearic acid coming from the castor oil. This fatty acid has very advantageous foaming properties compared to conventional synthetic surfactant systems: it enables the production of foams which are at the same time very abundant and, remarkably, stables over a span lasting more than 6 months. Moreover, these foams are thermoresponsive because the foam stability can be easily modulated by a simple modification of the temperature.

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Influence of interfacial rheology on foam and emulsion properties

Cited by 452 publications

References 38 publications

Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations

Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations

Empirical Modeling of the Viscosity of Supercritical Carbon Dioxide Foam Fracturing Fluid under Different Downhole Conditions

Les acides gras hydroxylés : agro-tensioactifs aux propriétés moussantes originales

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