Pickering Emulsions Stabilized by Soft Microgels: Influence of the Emulsification Process on Particle Interfacial Organization and Emulsion Properties

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• 作者：Mathieu Destribats ; M茅lanie Wolfs ; Florent Pinaud ; V茅ronique Lapeyre ; Elisabeth Sellier ; V茅ronique Schmitt ; Val茅rie Ravaine
• 刊名：Langmuir
• 出版年：2013
• 出版时间：October 8, 2013
• 年：2013
• 卷：29
• 期：40
• 页码：12367-12374
• 全文大小：316K
• 年卷期：v.29,no.40(October 8, 2013)
• ISSN：1520-5827

文摘

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鈥搘ater 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鈥搘ater 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.