The Effect of Mechanical Activation of the Surface of Inorganic Pigments on the Stability of Their Aqueous Dispersions in the Presence of Ethylhydroxyethyl Cellulose
| Autor: | Yu. A. Khrustalev, I. F. Kuz'kina, I. A. Arutyunov, Nikolay A. Bulychev, N. V. Serebryakova, Vitali Zubov |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Mineralogy Surfaces and Interfaces Polymer adsorption Polymer Titanium oxide chemistry.chemical_compound Colloid and Surface Chemistry Adsorption chemistry Chemical engineering Coagulation (water treatment) Particle size Physical and Theoretical Chemistry Cellulose Macromolecule |
| Zdroj: | Colloid Journal. 66:302-310 |
| ISSN: | 1061-933X |
| DOI: | 10.1023/b:coll.0000030840.55905.f0 |
| Popis: | The effect of mechanical activation of the surfaces of TiO2 and Fe2O3 inorganic pigments on the stability of their aqueous dispersions in the presence of a nontoxic water-soluble polymer, ethylhydroxyethyl cellulose (EHEC), was investigated. The mechanical activation of dispersions was performed under the action of ultrasonic field and in a laboratory disintegrator. Intense mechanical action on aqueous dispersions of TiO2 and Fe2O3 in the absence of polymer leads to their fast coagulation. In the presence of EHEC, a weak stabilizing effect was observed which was enhanced significantly upon the mechanical treatment of the dispersions. It is shown that the ultrasonic treatment of aqueous dispersions of inorganic pigments results in a significant narrowing of particle size distributions for both pigments. It is found that the interaction of EHEC with the pigment surface proceeding through the adsorption mechanism is accompanied by conformational transformations and changes in the configuration of adsorbed macromolecules. Vigorous mechanical action results in the activation of the processes of polymer adsorption on freshly formed surfaces of the pigments and in the formation of solvated adsorption layers of EHEC which determine the sedimentation stability of the systems. |
| Databáze: | OpenAIRE |
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