| Titre : |
Advanced adsorption for actives application |
| Type de document : |
texte imprimé |
| Auteurs : |
Lorna M. Kessel, Auteur ; Benjamin J. Naden, Auteur ; Ian R. Tooley ; Tharwat F. Tadros |
| Année de publication : |
2007 |
| Article en page(s) : |
p. 16-28 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Adsorption
Cosmétiques
Dioxyde de titane
Dispersions et suspensions
Emulsions -- Emploi en cosmétologie
Emulsions -- Stabilité
Formulation (Génie chimique)
Paramètres de solubilité
Peau -- Soins et hygiène
Polymères
Produits antisolaires
Rhéologie
solvants
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
The integration of colloid and cosmetic science has provided a sound basis on which to carry out true optimisation of consumer acceptable sunscreen formulations based upon particulate Ti02 which is of particular benefit in daily skin care formulation. Adsorption isotherms, dispersant demand and solids loading determinations enabled a model to be developed which related the rheology, stability and maximum efficacy of the dispersions to the structure of the adsorbed layer.
It was found that both dispersion stability and dispersion rheology depended upon adsorbed amount Γ and steric layer thickness δ (which in turn depends on oligomer molecular weight Mn and solvency χ) but that in order to optimise formulation, the adsorption strength χ, must also be considered. The nature of interaction between particles, dispersant, emulsifiers and thickeners must be considered with regard to competitive adsorption and/or interfacial stability if a formulation is to deliver its required protection when spread on the skin. |
| Note de contenu : |
- Steric stabilisation
- Solubility parameters
- Steric stabilisation continued
- Materials and methods
- Results and discussion
- Competitive interactions in formulations
- Tables : 1. Surface modified TiO2 powder - 2. Sunscreen emulsion formulations from dispersions of powders B and C - 3. Hansen and Beerbower solubility parameters for the polymer and both solvents |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30977 |
in SOFW JOURNAL > Vol. 133, N° 4 (04/2007) . - p. 16-28
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