Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface
The adsorption behaviour of linear poly(oxyethylene) alkyl ether (C<sub>n</sub>EO<sub>m</sub>) is best described by a reorientation model. Based on a complete set of experimental data, including the adsorption kinetics, the equilibrium surface tension isotherm and the surface...
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MDPI AG
2021-03-01
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| Series: | Colloids and Interfaces |
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| Online Access: | https://www.mdpi.com/2504-5377/5/1/16 |
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| author | Valentin B. Fainerman Volodymyr I. Kovalchuk Eugene V. Aksenenko Francesca Ravera Libero Liggieri Giuseppe Loglio Alexander V. Makievski Emanuel Schneck Reinhard Miller |
| author_facet | Valentin B. Fainerman Volodymyr I. Kovalchuk Eugene V. Aksenenko Francesca Ravera Libero Liggieri Giuseppe Loglio Alexander V. Makievski Emanuel Schneck Reinhard Miller |
| author_sort | Valentin B. Fainerman |
| collection | DOAJ |
| description | The adsorption behaviour of linear poly(oxyethylene) alkyl ether (C<sub>n</sub>EO<sub>m</sub>) is best described by a reorientation model. Based on a complete set of experimental data, including the adsorption kinetics, the equilibrium surface tension isotherm and the surface dilational visco-elasticity, the thermodynamic and kinetic adsorption parameters for some C<sub>n</sub>EO<sub>m</sub> at the water/air interface were determined. For the study, six C<sub>n</sub>EO<sub>m</sub> surfactants were selected (<i>n</i> = 10, 12 and 14 and <i>m</i> = 4, 5 and 8) and were studied by bubble profile analysis and maximum bubble pressure tensiometry. A refined theoretical model based on a reorientation-adsorption model combined with a diffusion-controlled adsorption kinetics and exchange of matter allowed us to calculate the surface layer composition by adsorbing molecules in different orientations. It turns out that at larger surface coverage, the adsorption rate decreases, i.e., the apparent diffusion coefficients are smaller. This deceleration can be explained by the transition of molecules adsorbed in a state of larger molar surface area into a state with smaller molar surface area. |
| first_indexed | 2024-03-10T13:11:29Z |
| format | Article |
| id | doaj.art-448c6e17f65c4c028aa999f8a762d8c4 |
| institution | Directory Open Access Journal |
| issn | 2504-5377 |
| language | English |
| last_indexed | 2024-03-10T13:11:29Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colloids and Interfaces |
| spelling | doaj.art-448c6e17f65c4c028aa999f8a762d8c42023-11-21T10:44:16ZengMDPI AGColloids and Interfaces2504-53772021-03-01511610.3390/colloids5010016Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air InterfaceValentin B. Fainerman0Volodymyr I. Kovalchuk1Eugene V. Aksenenko2Francesca Ravera3Libero Liggieri4Giuseppe Loglio5Alexander V. Makievski6Emanuel Schneck7Reinhard Miller8SINTERFACE Technologies, D12489 Berlin, GermanyInstitute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, 03680 Kyiv (Kiev), UkraineInstitute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine, 03680 Kyiv (Kiev), UkraineCNR—Institute of Condensed Matter Chemistry and Technologies for Energy, Unit of Genoa, 16149 Genoa, ItalyCNR—Institute of Condensed Matter Chemistry and Technologies for Energy, Unit of Genoa, 16149 Genoa, ItalyCNR—Institute of Condensed Matter Chemistry and Technologies for Energy, Unit of Genoa, 16149 Genoa, ItalySINTERFACE Technologies, D12489 Berlin, GermanyPhysics Department, Technical University Darmstadt, 64289 Darmstadt, GermanyPhysics Department, Technical University Darmstadt, 64289 Darmstadt, GermanyThe adsorption behaviour of linear poly(oxyethylene) alkyl ether (C<sub>n</sub>EO<sub>m</sub>) is best described by a reorientation model. Based on a complete set of experimental data, including the adsorption kinetics, the equilibrium surface tension isotherm and the surface dilational visco-elasticity, the thermodynamic and kinetic adsorption parameters for some C<sub>n</sub>EO<sub>m</sub> at the water/air interface were determined. For the study, six C<sub>n</sub>EO<sub>m</sub> surfactants were selected (<i>n</i> = 10, 12 and 14 and <i>m</i> = 4, 5 and 8) and were studied by bubble profile analysis and maximum bubble pressure tensiometry. A refined theoretical model based on a reorientation-adsorption model combined with a diffusion-controlled adsorption kinetics and exchange of matter allowed us to calculate the surface layer composition by adsorbing molecules in different orientations. It turns out that at larger surface coverage, the adsorption rate decreases, i.e., the apparent diffusion coefficients are smaller. This deceleration can be explained by the transition of molecules adsorbed in a state of larger molar surface area into a state with smaller molar surface area.https://www.mdpi.com/2504-5377/5/1/16poly(oxyethylene) alkyl etheradsorption kineticssurface tension isothermdilational surface visco-elasticitydiffusion-controlled adsorptionreorientation model |
| spellingShingle | Valentin B. Fainerman Volodymyr I. Kovalchuk Eugene V. Aksenenko Francesca Ravera Libero Liggieri Giuseppe Loglio Alexander V. Makievski Emanuel Schneck Reinhard Miller Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface Colloids and Interfaces poly(oxyethylene) alkyl ether adsorption kinetics surface tension isotherm dilational surface visco-elasticity diffusion-controlled adsorption reorientation model |
| title | Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface |
| title_full | Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface |
| title_fullStr | Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface |
| title_full_unstemmed | Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface |
| title_short | Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed C<sub>n</sub>EO<sub>m</sub> Layers at the Aqueous Solution/Air Interface |
| title_sort | thermodynamics kinetics and dilational visco elasticity of adsorbed c sub n sub eo sub m sub layers at the aqueous solution air interface |
| topic | poly(oxyethylene) alkyl ether adsorption kinetics surface tension isotherm dilational surface visco-elasticity diffusion-controlled adsorption reorientation model |
| url | https://www.mdpi.com/2504-5377/5/1/16 |
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