Adsorption and rheological characteristics of humic acid salts at liquid-gas interfaces |
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| Authors: | S. L. Khil’ko A. I. Kovtun V. B. Fainerman V. I. Rybachenko |
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| Affiliation: | 1.Institute of Physicoorganic and Coal Chemistry,National Academy of Sciences of Ukraine,Donetsk-114,Ukraine;2.Donetsk National Medical University,Donetsk-003,Ukraine |
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| Abstract: | Du Noöy ring and oscillating droplet methods are used to study the adsorption and dilatation rheological characteristics (viscoelastic modulus and phase angle) of aqueous solutions of humic acid salts at liquid-gas interfaces. It is established that the equilibrium surface tension and limiting surface elasticity of humic acid salt solutions are in good agreement with the model of a real two-dimensional solution that was previously proposed for biopolymers. Based on the results of analyzing dynamic surface tension and adsorption kinetics, it is shown that humic acid salts are characterized by a nondiffusion (barrier) adsorption mechanism. |
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