Tensiometric and Rheological Characteristics of Fractions of Humic and Hymatomelanic Acids
| Autor: | S. L. Khil’ko, R. G. Semenova, R. A. Makarova, M. I. Rogatko |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution 010304 chemical physics Chemistry Drop (liquid) Modulus 02 engineering and technology Surfaces and Interfaces 021001 nanoscience & nanotechnology 01 natural sciences Viscoelasticity Condensed Matter::Soft Condensed Matter Surface tension Colloid and Surface Chemistry Chemical engineering Polyelectrolyte adsorption Rheology 0103 physical sciences Acid salt Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Colloid Journal. 81:779-789 |
| ISSN: | 1608-3067 1061-933X |
| DOI: | 10.1134/s1061933x2001007x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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