Abstract
More than a century ago, researchers observed that colloidal particles attached to bubbles and drops stabilize foams and emulsions, suggesting that particle hydrophobicity is in control. This trick is difficult to implement at industrial scale, though, and its physical processes are still debated. This Letter presents an encapsulation technique that is both practical and quantitatively described by heterogeneous electrostatic double-layer interactions, not hydrophobicity. The authors create---at low cost and industrial scale---a wide variety of ``bubbloons'' and ``droploids'', thanks to diverse protective shells that remain stable for years. This could impact a host of industrial applications.
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