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A novel nanoemulsification method of stirring at the Θ-point with the tocopherol-based block co-polymer nonionic emulsifier PPG-20 Tocophereth-50 / Young-Dae Kim in IFSCC MAGAZINE, Vol. 7, N° 4 (10-11-12/2004)
[article]
Titre : A novel nanoemulsification method of stirring at the Θ-point with the tocopherol-based block co-polymer nonionic emulsifier PPG-20 Tocophereth-50 Type de document : texte imprimé Auteurs : Young-Dae Kim, Auteur ; Jung-Soo Kim, Auteur ; Iwhan Cho, Auteur ; Ki Woo Kim, Auteur Année de publication : 2004 Article en page(s) : p. 319-325 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Nanoemulsion 'weight fraction of dispersed phase (?)' 'block co-polymer amphiphile' 'mean particle size' stability 'cryo-scanning electron microscopy' '?-point' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Nanoemulsions have recently become increasingly important as potential vehicles for the controlled delivery of cosmetics and for the optimized dispersion of active ingredients in particular skin layers. The preparation of conventional nanoemulsions requires mainly high-pressure homogenization, which is unproductive and requires high energy due to its lower efficiency, limiting their practical applications. In order to solve these problems novel nanoemulsions were studied using a model system of pseudo-ternary water/emulsifier/paraffin oil. Nanoemulsions were prepared by stirring a mixture of the tocopherol-containing block co-polymer emulsifier PPG-20 Tocophereth-50, paraffin oil, and distilled water at the Θ-point using weight fractions of the dispersed phase (φ) of 0.31 to 0.82 and an emulsifier content of 1.0 to 9 wt.%. The emulsifying property of PPG-20 Tocophereth-50 in nanoemulsions was compared with that of the conventional emulsifiers Tocophereth-43, a mixture of polysorbate 60 and sesquioleate (3/1), and phospholipids. Also the emulsifying property of PPG-20 Tocophereth-50 in the more hydrophilic oils caprylic/capric triglyceride and octyldodecanol was compared with that in paraffin oil. The stability and morphology of the resulting nanoemulsions were studied by visual inspection, optical microscopy, particle size analysis, and cryo-scanning electron microscopy. In the nanoemulsion systems containing caprylic/capric triglyceride and octyldodecanol, respectively, as an oil phase PPG-20 Tocophereth-50 showed emulsification properties similar to those in paraffin oil. The conventional emulsifiers Tocophereth-43, a mixture of polysorbate 60 and sesquioleate (3/1), and phospholipids did not give nanoemulsions with high-speed stirring. The block co-polymer nonionic emulsifier PPG-20 Tocophereth-50 was found to produce stable nanoemulsions of mean droplet diameters ranging from 204 to 499 nm. The emulsification method of high-speed stirring at the Θ-point using PPG-20 Tocophereth-50 was found to be very effective for the preparation of stable nanoemulsions useful for applications in skincare cosmetics, cosmeceuticals, and drugs. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10485
in IFSCC MAGAZINE > Vol. 7, N° 4 (10-11-12/2004) . - p. 319-325[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003885 - Périodique Bibliothèque principale Documentaires Disponible Electrokinetic / Olga A. Kulikova in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/00 (07-08/2000)
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Titre : Electrokinetic : Properties of combined alkyd-acrylic dispersions Type de document : texte imprimé Auteurs : Olga A. Kulikova, Auteur ; Eugeny A. Indeikin, Auteur ; Vladimir B. Manerov, Auteur ; Natalija B. Skopintseva, Auteur Année de publication : 2000 Article en page(s) : p. 32-35 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Coating material;'Water base paint' 'Aqueous dispersion' 'Acrylic polymer' Emulsion Oligomer 'Alkyd resin' 'Electrical properties' 'Electrokinetic potential' 'Electrophoretic mobility' pH 'Particle size' Index. décimale : 667.9 Revêtements et enduits Résumé : Fast drying, high protective properties and adhesion to a lot of substrates can be provided by combined binders of thermoplastic polymer dispersions and alkyd oligomer emulsions. To assure their successful use it is essential to avoid deterioration of aggregate stability may be caused by different dispersion composition of combined dispersion phases, in all cases however the determining factor is electrokinetic property of dispersions. In this study the influence of dispersion phase particles, pH of dispersion medium of combined acrylic dispersions and alkyd emulsions stabilized with different types of surfactants on electrokinetic potential is shown. Note de contenu : - Characterization of an electric double layer
- Factors influencing the electrokinetic potential of dispersion phase particles
- ζ-potential of alkyd emulsions with different particle sizes is negative in a wide range of pH values
- ζ-potential increases when pH exceeds 7.0
- Light transmission is sharply decreased in incompatibility zonePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11015
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/00 (07-08/2000) . - p. 32-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000621 - Périodique Bibliothèque principale Documentaires Disponible 000622 - Périodique Bibliothèque principale Documentaires Disponible