Tensiometric and Rheological Characteristics of Fractions of Humic and Hymatomelanic Acids

The Du Nouy ring detachment and pendant drop methods have been employed to study the tensiometric (dynamic and equilibrium surface tensions) and surface rheological (viscoelasticity modulus and phase angle) characteristics of aqueous solutions of fractions of humic and hymatomelanic acids at a solut...

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Bibliographic Details
Published in:Colloid journal of the Russian Academy of Sciences 2019-11, Vol.81 (6), p.779-789
Main Authors: Khil’ko, S. L., Rogatko, M. I., Makarova, R. A., Semenova, R. G.
Format: Article
Language:English
Subjects:
Acids
Aqueous solutions
Chemistry
Chemistry and Materials Science
Polyelectrolytes
Polymer Sciences
Rheological properties
Rheology
Saline solutions
Surface layers
Surface tension
Surfaces and Interfaces
Thin Films
Two dimensional models
Viscoelasticity
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Summary:The Du Nouy ring detachment and pendant drop methods have been employed to study the tensiometric (dynamic and equilibrium surface tensions) and surface rheological (viscoelasticity modulus and phase angle) characteristics of aqueous solutions of fractions of humic and hymatomelanic acids at a solution–air interface. It has been found that the fraction of low-molecular-weight hymatomelanic acids has high surface activity, while its surface layers are characterized by high viscoelasticity and storage elastisity moduli. The experimental dependences of the equilibrium surface tension and viscoelasticity modulus on the concentration of hymatomelanic acid salt solutions are adequately described in terms of the model of real two-dimensional solutions for polymolecular adsorption of polyelectrolytes.
ISSN:1061-933X
1608-3067
DOI:10.1134/S1061933X2001007X