| Titre : |
Mixing and rheology explained |
| Type de document : |
texte imprimé |
| Auteurs : |
Maria Lüder, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
p. 29-34 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cosmétiques
Emulsifiants
Emulsions -- Emploi en cosmétologie
Malaxeurs et mélangeurs
Rhéologie
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
Cosmetic formulations consist of complex ingredient mixtures. The nature of these ingredients does not always allow for simple mixing. Oil and water as two phases of an emulsion can be mixed but cannot be kept stable as a mixture without the help of an emulsifier and the right mixing equipment.
A number of stirrers, homogenisers and process mixers are available, but which equipment can be used best for a specific formulation development? Stirrers providing lamellar flow or turbulent flow have different geometries. When is high shear needed and when is low shear needed? What role does the homogeniser play? The emulsification is the outcome of two processes: breaking of the oil phase into small drops and the stabilisation of the formed drops. The initial particle size distribution of an emulsion is the result of both steps. The particle size distribution plays a critical role for the emulsion stability, but how can the particle size distribution be determined and which particle size will provide a stable emulsion? The viscosity of the emulsion and the rheological properties are dependent on the particle size distribution. Emulsions can be fluid like milk and viscous like toothpaste. Both emulsion types should be easily applicable to skin. Mixing of complex mixtures seems easier than it really is. However, with just some background information of the effect good mixing equipment can provide, the mixing process becomes a sensible tool rather than a threat and it leads to stable formulations. |
| En ligne : |
https://drive.google.com/file/d/1pq9JHbQ4d3fytY2lOl3VncXhYUFMWbcI/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10363 |
in PERSONAL CARE EUROPE > Vol. 3, N° 3 (09/2010) . - p. 29-34
Aller sur edunet
Accueil
Mixing and rheology explained in PERSONAL CARE EUROPE, Vol. 3, N° 3 (09/2010)
