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Microbubble Encapsulation by Electrostatic Templating with Ionic Surfactants
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DOI：10.1103/PhysRevApplied.18.L011001.png)
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Abstract
En 中文
We propose an original microbubble encapsulation process, using electrostatics as a driving force to guide either particles or polymerizable precursors to the bubble surface. Taking advantage of attractive interactions between surfactant-laden charged bubbles and oppositely charged self-assembling species, our method produces capsules with diverse protective shells that remain stable for years. Considering heterogeneous electrostatic double-layer interactions, we quantitatively predict critical particle surface potentials required for complete encapsulation. The particle-based shells can be disintegrated with a pH adjustment, allowing for a controlled release of encapsulated payloads, while the glassy continuous silicate capsules are chemically resistant to pH changes. Our process, which can be equally applied to liquid droplets, easily scales up for industrial developments.
Keywords:
HYDROPHOBIC FORCE
STABILITY
COAGULATION
FLOTATION
BUBBLES
FOAMS
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