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Mixed adsorption of anionic and nonionic surfactants on latex particles / Margareta Huldén in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 835 (08/1994)
[article]
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
SurfactantsIndex. 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 contentsPermalink : 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[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003469 - Périodique Bibliothèque principale Documentaires Disponible 003482 - Périodique Bibliothèque principale Documentaires Exclu du prêt A new class of labile surfactants that break down to non-surface active products upon heating or after a pre-set time, without the need for a pH change / M. Andersson in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)
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Titre : A new class of labile surfactants that break down to non-surface active products upon heating or after a pre-set time, without the need for a pH change Type de document : texte imprimé Auteurs : M. Andersson, Auteur ; A. Hillerström, Auteur ; A. Svensk, Auteur ; S. R. Younesi, Auteur ; E. Sjöström, Auteur ; I. Blute, Auteur ; Mikael Kjellin, Auteur ; J. Kizilng, Auteur ; B. Kronberg, Auteur ; J. Oldgren, Auteur ; A. Hansson, Auteur ; S. Sjöstrand, Auteur Année de publication : 2008 Article en page(s) : p. 366-372 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Labile surfactants Cleavable Car washing degreasing Alkyl ketene dimer Beta-keto Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A new class of labile surfactants that break down at a controllable rate without the need for a change in pH will be presented. The invention has been patented by YKI Institute for Surface Chemistry, and is based on use of béta-keto acids or their salts as surface-active compounds. These surfactants spontaneously break down through decarboxylation, to form an oil-like ketone and CO2/HCO3–/CO32– depending on pH. The rate of breakdown can be controlled within a wide range by temperature or by certain additives, but, unlike most cleavable surfactants, a change in pH is not needed. Furthermore the surfactants can be conveniently activated from a stabile precursor just before use, and one (of many possible) precursors of this kind is already available on the industrial scale in the form of a well-known chemical that is FDA-approved in other, non-surfactant, applications. The compound in question, alkyl ketene dimer (AKD), is produced in large scale by a number of large chemical producers today, and used for hydrophobization of paper. The present article gives an overview of the surfactant chemistry, with focus on recent studies of the kinetics of activation of the surfactant precursor and breakdown kinetics of the labile surfactant at different conditions. Furthermore, possible industrial applications of the surfactant will be discussed, with one example taken from a recent feasibility Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3199
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 366-372[article]Réservation
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