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Self-stabilising water-in-oil droplets through controlled spontaneous emulsification
Kate A Sanders1, Niamh Willis-Fox1, Ronan Daly1
1Department of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
Journal of Colloid and Interface Science
|May 17, 2025
Summary
Spontaneous emulsification can enhance water-in-oil emulsion stability by forming self-stabilizing structures. Optimal stability requires robust interfacial films and controlled viscosity, avoiding low viscosity or excessive deformation.
Area of Science:
- Colloid and surface science
- Materials science
- Chemical engineering
Background:
- Stabilizing water-in-oil (W/O) emulsions against coalescence is crucial for applications like reactions and encapsulation.
- The role of spontaneous emulsification in enhancing macroemulsion stability is not well understood.
Purpose of the Study:
- To investigate the influence of spontaneous emulsification on W/O macroemulsion stability.
- To explore spontaneous emulsification as a practical strategy for emulsion stabilization.
- To characterize factors affecting this process in various systems.
Main Methods:
- Time-resolved optical microscopy, dynamic light scattering, and rheology were used to study daughter droplet behavior.
- Investigated effects of surfactant composition and viscosity in mixed oil phases (isoparaffin with oleic acid or mineral oil).
Main Results:
- Identified daughter droplet assembly into elastic interfacial structures as a self-stabilization mechanism.
- Demonstrated that effective stabilization depends on robust interfacial films and controlled continuous phase viscosity.
- Showed that low viscosity prevents structure assembly, while high viscosity causes buckling and deformation.
Conclusions:
- Spontaneous emulsification can be harnessed for emulsion self-stabilization through interfacial structure formation.
- Effective stabilization requires careful control of viscosity and interfacial film properties.
- This strategy offers a cost-effective and composition-versatile approach to emulsion formulation.
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