Dynamic surface and interfacial tensions of surfactant and polymer solutions

Miller, R.; Joos, P.; Fainerman, V. B.

doi:10.1016/0001-8686(94)80017-0

Cited by 243 publications

(162 citation statements)

References 167 publications

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“…The agreement between the two methods is good and the deviations do not exceed the error of the individual method. The accuracy of the interfacial tension or the interfacial pressure measurements was ± 0.1 mN/m, in agreement with literature data [20,42]. All measurements were performed at constant temperature of 20 ± 0.1…”

Section: Methodssupporting

confidence: 88%

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Kinetic study of adsorption of some biocompounds at the oil/water interface

et al. 2005

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The adsorption kinetics of some local anesthetics, like dibucaine and tetracaine, and of stearic acid from bulk solutions at the oil/water interface was studied by using the pendent drop and ring methods. The anesthetics were dissolved in aqueous solutions (pH 2), and the fatty acid was dissolved in benzene, each biocompound at several different concentrations in bulk solutions. Kinetic equations for Langmuir mechanism of adsorption at oil/water interface were tested. The kinetic analysis shows that Langmuir kinetic approach describes the dynamic interfacial pressures within the limits of the experimental errors over a wide range of time and for different surfactant concentrations in bulk solutions. It is also concluded that this approach allows the calculation of the ratio of the adsorption and desorption rate constants of these biocompounds at the oil/water interface. Obtained results are in substantial agreement with earlier reported data for the surfactant adsorption as well as with their molecular structure.

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Section: Methodssupporting

confidence: 88%

“…In our cases it is found that experimental data cannot be understood by a simple diffusion and one must drop the boundary condition of local equilibrium [6,7], and replace it by Langmuir kinetic approach [8,42] of the following form:…”

Section: Kinetic Theory Of Adsorptionmentioning

confidence: 96%

Kinetic study of adsorption of some biocompounds at the oil/water interface

et al. 2005

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“…[ 49 ] In the maximum bubble pressure method, pressure oscillations must be distinct and large enough to be measured accurately, and systems with small volumes can lead to errors in the measured interfacial tension, and should thus be avoided. [ 50 ] Short-time tension values tend to be overestimated by the drop volume technique; however, corrections exist in the literature. [ 50 ] Quiescent techniques may be able to measure bulk diffusivity and to measure interfacial rate constants in some cases, but they cannot measure coupled fl ow effects.…”

Section: Deformabilitymentioning

confidence: 99%

Interfacial Rheology Through Microfluidics

et al. 2010

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The bulk properties and structural characteristics of emulsions arise substantially from their interfacial rheology, which depends strongly on surfactant mass transfer and its coupling to flow. Typical methods used to measure such properties often employ simpler flows and larger drops than those encountered in typical processing applications. Mass transfer mechanisms are governed by droplet size; therefore experimentation at length scales typical of those encountered in applications is desired. Utilizing a microfluidic approach allows high-throughput experimentation at relevant length scales and with adjustable flow dynamics. Using a microfluidic device that facilitates the measurement of interfacial tension in two-phase droplet flows, particle tracers are also used to determine the droplet internal circulation velocity as a measure of interfacial mobility. Combining these measurements in a single device, the coupling between interfacial tension, interfacial retardation, and surfactant mass transfer is explored and mass transfer coefficients and interfacial mobility are measured for a two-phase system containing a diffusing surfactant. Such a device is also used to probe the deformability of elastic capsules and viscoelastic biological cells.

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“…We have investigated the dynamics of surfactant adsorption for a planar interface, using the classical Ward-Tordai problem (Miller et al 1994), where one considers an interface in contact with a semi-infinite bulk phase, having initially a homogeneous surfactant concentration, ψ b , while the interface is depleted of surfactants ψ 0 ðt ¼ 0Þ ¼ 0: Surfactants will diffuse from the bulk phase to the interface. Hence, the surfactant concentration at the interface will rise, while depleting the bulk phase adjacent to the interface, the so-called sublayer.…”

Section: Adsorption Dynamicsmentioning

confidence: 99%

Diffuse interface model of surfactant adsorption onto flat and droplet interfaces

2006

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For applications where droplet breakup and surfactant adsorption are strongly coupled, a diffuse interface model is developed. The model is based on a free energy functional, partly adapted from the sharp interface model of [Diamant and Andelman 34(8):575-580, (1996)]. The model is implemented as a 2D Lattice Boltzmann scheme, similar to existing microemulsion models, which are coupled to hydrodynamics. Contrary to these microemulsion models, we can describe realistic adsorption isotherms, such as the Langmuir isotherm. From the free energy, functional analytical expressions of equilibrium properties are derived, which compare reasonably with numerical results. Interfacial tension lowering scales with the logarithm of the area fraction of the interface unloaded with a surfactant: Δσ $ lnð1 À ψ 0 Þ: Furthermore, we show that adsorption kinetics are close to the classical relations of Ward and Tordai. Prelimary simulations of droplets in shear flow show promising results, with surfactants migrating to interfacial regions with highest curvature. We conclude that our diffuse interface model is very promising for apprehending the above-mentioned applications as membrane emulsification.

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Dynamic surface and interfacial tensions of surfactant and polymer solutions

Cited by 243 publications

References 167 publications

Kinetic study of adsorption of some biocompounds at the oil/water interface

Kinetic study of adsorption of some biocompounds at the oil/water interface

Interfacial Rheology Through Microfluidics

Diffuse interface model of surfactant adsorption onto flat and droplet interfaces

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