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Ionic Liquid-Containing Pickering Emulsions Stabilized by Graphene Oxide-Based Surfactants
Qinmo Luo1, Yifei Wang1, Esther Yoo1
1Department of Chemistry , Case Western Reserve University , 10900 Euclid Avenue , Cleveland , Ohio 44106 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 1, 2018
Summary
Graphene oxide nanoparticles create stable ionic liquid emulsions. Modified nanoparticles enable both IL-in-water and IL-in-oil Pickering emulsions, expanding applications for advanced materials.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
- Nanotechnology
Background:
- Pickering emulsions, stabilized by particles, offer an alternative to traditional emulsion systems.
- Developing novel particle surfactants is key for advanced emulsion applications.
- Ionic liquids (ILs) present unique properties but require specific stabilization methods for emulsions.
Purpose of the Study:
- To prepare and characterize ionic liquid-in-water and ionic liquid-in-oil emulsions stabilized by graphene oxide (GO)-based nanoparticles.
- To investigate the influence of particle concentration, fluid ratios, and pH on emulsion stability.
- To demonstrate the versatility of GO-based surfactants for various ILs and inverted emulsion systems.
Main Methods:
- Synthesis of graphene oxide (GO) and alkylated graphene oxide (C18-GO) nanoparticles.
- Preparation of IL-in-water and IL-in-oil emulsions using GO and C18-GO as stabilizers.
- Systematic study of emulsion formation and stability under varying conditions (particle concentration, fluid ratio, pH).
- Functionalization of GO with perfluorinated alkyl chains to achieve dispersibility in ILs for inverted emulsions.
Main Results:
- GO nanosheets effectively stabilized [Bmim][PF6]-in-water emulsions.
- C18-GO nanosheets successfully stabilized [Bmim][PF6]-in-oil emulsions.
- Emulsion stability was influenced by particle concentration, fluid ratio, and pH, with differing effects on aqueous and oil systems.
- Water-in-IL and oil-in-IL emulsions were successfully prepared using functionalized GO, demonstrating tunable interfacial properties.
Conclusions:
- Graphene oxide-based nanoparticles are effective stabilizers for a range of ionic liquid emulsions.
- Tailoring the surface chemistry of GO allows for the creation of both conventional and inverted Pickering emulsions.
- This work provides a foundation for designing complex composite materials utilizing ionic liquid emulsions stabilized by nanoparticles.
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