Universal emulsion stabilization from the arrested adsorption of rough particles at liquid-liquid interfaces
Anachkov, Svetoslav E.
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
Surface heterogeneities, including roughness, significantly affect the adsorption, motion and interactions of particles at fluid interfaces. However, a systematic experimental study, linking surface roughness to particle wettability at a microscopic level, is currently missing. Here we synthesize a library of all-silica microparticles with uniform surface chemistry, but tuneable surface roughness and study their spontaneous adsorption at oil–water interfaces. We demonstrate that surface roughness strongly pins the particles’ contact lines and arrests their adsorption in long-lived metastable positions, and we directly measure the roughnessinduced interface deformations around isolated particles. Pinning imparts tremendous contact angle hysteresis, which can practically invert the particle wettability for sufficient roughness, irrespective of their chemical nature. As a unique consequence, the same rough particles stabilize both water-in-oil and oil-in-water emulsions depending on the phase they are initially dispersed in. These results both shed light on fundamental phenomena concerning particle adsorption at fluid interfaces and indicate future design rules for particle-based emulsifiers. Show more
Journal / seriesNature Communications
Pages / Article No.
PublisherNature Publishing Group
SubjectSurfaces; interfaces and thin films; Wetting
Organisational unit09455 - Isa, Lucio / Isa, Lucio
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