Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 349, Issue 2, Pages 537-543Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.05.089
Keywords
Particle-stabilised emulsions; Pickering emulsions
Categories
Funding
- Australian Research Council Linkage Scheme
- AMIRA International
- State Governments of South Australia and Victoria
- FABLS network [RN0460002]
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The remarkable stability of nanoparticles attached to oil-water interfaces in macroemulsions hinders controlled detachment of these particles from emulsions. In this work it is shown that adding surfactant molecules which preferentially adsorb at the oil-water interface displaces nanoparticles from the interface. Surfactant adsorption at the oil-water interface is energetically favoured and readily occurs on mixing nanoparticle-stabilised oil-in-water emulsions with surfactant solutions. Depending on the surfactant concentration, there is a significant reduction in the interfacial tension. Hence there is substantial fragmentation of the oil droplets and foaming of the emulsion during mixing. Surfactant concentrations above the critical micelle concentration are required to achieve complete interfacial displacement and hence recovery of the nanoparticles from the emulsions. The effects of surfactant addition have important implications for tailoring the interfacial composition of emulsions. (C) 2010 Elsevier Inc. All rights reserved.
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