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Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed CnEOm Layers at the Aqueous Solution/Air Interface

Fainerman, Valentin B. ; Kovalchuk, Volodymyr I. ; Aksenenko, Eugene V. ; Ravera, Francesca ; Liggieri, Libero ; Loglio, Giuseppe ; Makievski, Alexander V. ; Schneck, Emanuel ; Miller, Reinhard (2022):
Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed CnEOm Layers at the Aqueous Solution/Air Interface. (Publisher's Version)
In: Colloids and Interfaces, 5 (1), MDPI, e-ISSN 2504-5377,
DOI: 10.26083/tuprints-00019610,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Thermodynamics, Kinetics and Dilational Visco-Elasticity of Adsorbed CnEOm Layers at the Aqueous Solution/Air Interface
Language: English
Abstract:

The adsorption behaviour of linear poly(oxyethylene) alkyl ether (CnEOm) 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 CnEOm at the water/air interface were determined. For the study, six CnEOm surfactants were selected (n = 10, 12 and 14 and m = 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.

Journal or Publication Title: Colloids and Interfaces
Volume of the journal: 5
Issue Number: 1
Publisher: MDPI
Collation: 16 Seiten
Uncontrolled Keywords: poly(oxyethylene) alkyl ether, adsorption kinetics, surface tension isotherm, dilational surface visco-elasticity, diffusion-controlled adsorption, reorientation model
Classification DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 02 Feb 2022 13:27
Last Modified: 02 May 2022 12:07
DOI: 10.26083/tuprints-00019610
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-196106
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19610
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