Pickering Emulsions Stabilized by Soft Microgels: Influence of the Emulsification Process on Particle Interfacial Organization and Emulsion Properties
| Autor: | Véronique Schmitt, Mélanie Wolfs, Elisabeth Sellier, Véronique Lapeyre, Valérie Ravaine, Florent Pinaud, Mathieu Destribats |
|---|---|
| Přispěvatelé: | Centre de recherches Paul Pascal (CRPP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires (ISM), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Université Sciences et Technologies - Bordeaux 1-Université Montesquieu - Bordeaux 4-Institut de Chimie du CNRS (INC), Centre de Ressources en Microscopie Electronique et Microanalyse (CREMEN), Université de Bordeaux (UB) |
| Rok vydání: | 2013 |
| Předmět: |
Flocculation
Materials science Nanotechnology Pickering emulsions 02 engineering and technology 010402 general chemistry 01 natural sciences Emulsification process Monolayer Electrochemistry General Materials Science Spectroscopy Soft microgels Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Pickering emulsion 0104 chemical sciences Shear (sheet metal) Sphere packing Chemical engineering Emulsion Particle Deformation (engineering) 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2013, 29, pp. 12367-12374. ⟨10.1021/la402921b⟩ |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la402921b |
| Popis: | 8 pages; International audience; This work reports a new evidence of the versatility of soft responsive microgels as stabilizers for Pickering emulsions. The organization of microgels at the oil−water interface is a function of the preparation pathway. The present results show that emulsification energy can be used as a trigger to modify microgel deformation at the oil−water interface and their packing density: high shear rates bring strong flattening of the microgels, whereas low shear rates lead to dense monolayers, where the microgels are laterally compressed. As a consequence, the resulting emulsions have opposite behavior in terms of flocculation, which arises from bridging between neighboring drops and is strongly dependent on their surface coverage. This strategy can be applied to any microgel which can sufficiently adsorb at low shear rates, i.e. small microgels or lightly cross-linked ones. The control of the organization of microgels at the interface does not only modify emulsion end-use properties but also constitutes a new tool for the development of Janus-type microgels, obtained by chemical modification of the adsorbed microgels. |
| Databáze: | OpenAIRE |
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