| Titre : |
Mixed adsorption of anionic and nonionic surfactants on latex particles |
| Type de document : |
texte imprimé |
| Auteurs : |
Margareta Huldén, Auteur ; B. Kronberg, Auteur |
| Année de publication : |
1994 |
| Article en page(s) : |
p. 67-77 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Adsorption
Concentration micellaire critique
Latex
Mélanges (chimie)
Modèles mathématiques
Revêtements en phase aqueuse:Peinture en phase aqueuse
Surfactants
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A model is presented for the adsorption of a mixture of an anionic and a nonionic surfactant on latex particles. The model is based on the Langmuir equation for adsorption and the regular solution theory for mixed micelle formation. Good agreement between the experimental data and the calculated adsorption was obtained with a mixture of sodium dodecyl sulphate (SDS) and nonylphenol ethoxylate (NPE10). The preferential adsorption of the more surface active NPE10 is greatest at the onset of micellization and diminishes as the total surfactant concentration increases. The composition of the mixed surfactant at the surface greatly depends on the total surfactant concentration and on the surface area/solution volume ratio. This is illustrated by the calculated adsorption equilibria at different conditions. Addition of small amounts of organic solvents (e.g., coalescing aids) increases the critical micelle concentration (cmc) of NPE and decreases the cmc of SDS. The decrease in the difference between the cmc values of the two surfactants is paralleled by a reduction in the preferential adsorption of the nonionic surfactant in the presence of a coalescing aid. |
| Note de contenu : |
- THEORY : A pseudo three-phase system - Monomer-micell equilibrium - Adsorption equilibria - Calculation of mixed adsorption - Adsorption and micellization free energies - Organic solvents
- EXPERIMENTAL : Materials - Procedures
- RESULTS : Critical micelle concentration - Individual adsorption of SDS and NPE - Mixed adsorption
- DISCUSSION : Individual adsorption of the surfactants - Mixed adsorption - Effect of coalescing aids on the mixed adsorption - Effect of solid contents |
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https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18680 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 835 (08/1994) . - p. 67-77
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Mixed adsorption of anionic and nonionic surfactants on latex particles in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 835 (08/1994)
