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Polyhedral Water Droplets: Shape Transitions and Mechanism
Shir R Liber1, Orlando Marin1, Alexander V Butenko1
1Physics Department & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Journal of the American Chemical Society
|April 21, 2020
Summary
Oil droplets can form polyhedral shapes, even with a concave interface. This discovery supports a new mechanism driven by the elasticity of a crystalline monolayer, not interfacial curvature.
Area of Science:
- Soft matter physics
- Materials science
- Surface chemistry
Background:
- Classical liquid droplets are typically rounded due to surface tension.
- Recent studies show oil droplets can transition to polyhedral shapes.
- The mechanism and role of interfacial curvature in this transition are debated.
Purpose of the Study:
- To investigate the mechanism behind polyhedral droplet formation.
- To determine the role of interfacial curvature in droplet faceting.
- To support or refute proposed mechanisms for droplet shape transitions.
Main Methods:
- Experimental observation of oil-suspended water droplets.
- Analysis of droplet shapes and interfacial properties.
- Investigation of self-assembled monolayers at the oil-water interface.
Main Results:
- Oil-suspended water droplets spontaneously form polyhedral shapes.
- Faceting occurs despite a concave oil-water interface.
- Results contradict mechanisms requiring a convex interface.
Conclusions:
- The elasticity of a self-assembled crystalline monolayer drives droplet faceting, independent of interface curvature.
- This finding supports an alternative mechanism for polyhedral droplet formation.
- The study opens avenues for synthesizing faceted nanoparticles and understanding morphogenesis.
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