Dynamic interfacial tension of triblock copolymers solutions at the water–hexane interface

[Display omitted] ► The experimental data have been explained on the basis of a thermodynamic model based on the analysis of the chemical potentials of the solvent and the dissolved substances. ► This model assumes the coexistence of different adsorbed states at the interface, depending on the surfa...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2011-11, Vol.391 (1), p.119-124
Main Authors: Ramírez, P., Muñoz, J., Fainerman, V.B., Aksenenko, E.V., Mucic, N., Miller, R.
Format: Article
Language:English
Subjects:
Adsorption
Adsorption isotherm
Adsorption kinetics
Block copolymers
colloids
composite polymers
Diffusion coefficient
diffusivity
Dynamics
Impact tests
Mathematical models
Multilayer formation
Oxides
Pluronics
Surface chemistry
surface tension
Water–hexane interface
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Summary:[Display omitted] ► The experimental data have been explained on the basis of a thermodynamic model based on the analysis of the chemical potentials of the solvent and the dissolved substances. ► This model assumes the coexistence of different adsorbed states at the interface, depending on the surface coverage. ► It has been shown that the best fit is achieved when a polylayer adsorption is considered. ► The theoretical predictions agree well with the experimental data for physically reasonable values of the adsorption layer thickness and realistic values of the diffusion coefficient. Equilibrium and dynamic surface tension of non-ionic triblock copolymers, Pluronics, varying in the number of poly(ethylene oxide) and poly(propylene oxide) groups have been measured by means of drop profile tensiometry at the water–hexane interface. The experimental data have been explained on the basis of a theory previously developed for protein solutions [1]. This model assumes the coexistence of different adsorbed states at the interface, depending on the surface coverage. It has been shown that the best fit is achieved when a polylayer adsorption is considered. Reasonable values of the adsorption layer thickness and realistic values of the diffusion coefficient are obtained which validate the model proposed.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2011.04.019