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Pickering Emulsions Stabilized with Millimeter-Sized Polymer Plates
Rina Kakiuchi1, Yuri Sakurai1, Hikaru Manabe1
1Division of Applied Chemistry, Environmental and Biomedical Engineering Graduate School of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 20, 2024
Summary
Hexagonal polymer plates stabilize emulsions, with smaller plates improving formability. Oil polarity and plate pre-dispersion significantly influence emulsion type and droplet shape, affecting stability.
Area of Science:
- Colloid and Surface Science
- Materials Science
Background:
- Emulsion stability is crucial in various industries.
- Controlling emulsion properties requires understanding stabilizer-emulsion interactions.
- Polymer micro/nanoparticles offer tunable properties for emulsion stabilization.
Purpose of the Study:
- To investigate the impact of hexagonal polymer plate stabilizers on emulsion characteristics.
- To correlate polymer plate size, oil polarity, and pre-emulsification dispersion with emulsion formability, type, and droplet morphology.
- To establish relationships between droplet-to-stabilizer size ratios and resulting droplet shapes.
Main Methods:
- Utilized uniform hexagonal polymer plates of (sub)millimeter size as emulsion stabilizers.
- Systematically varied plate size, oil polarity, and the medium in which plates were dispersed before emulsification.
- Analyzed emulsion formability, type (O/W vs. W/O), and droplet shapes under different conditions.
Main Results:
- Decreasing polymer plate size enhanced emulsion formability.
- Lower oil polarity favored oil-in-water (O/W) emulsions; increasing polarity promoted water-in-oil (W/O) emulsions.
- High oil polarity led to emulsion failure or macrophase separation.
- Plates pre-dispersed in oil exhibited increased lipophilicity compared to those dispersed in water.
- Droplet shape correlated with the droplet-to-plate size ratio: >2 yielded spherical, 1-2 yielded polyhedral, and <1 yielded sandwich-shaped droplets.
Conclusions:
- Hexagonal polymer plates effectively stabilize emulsions, with tunable properties based on size and polarity.
- Emulsion type and stability are strongly dependent on oil polarity and plate pre-treatment.
- The droplet-to-stabilizer size ratio is a key determinant of droplet morphology, enabling control over emulsion structure.
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