Generation of Superstable,Monodisperse Microbubbles Using a pH‐Driven Assembly of Surface‐Active Particles

Bubbling to the surface : Microscale gas bubbles can be generated in a microfluidic device by simultaneously injecting CO₂ and a dispersion of particles whose hydrophobicity increases as the pH value decreases. The CO₂ dissolves rapidly out of the bubbles, which shrink, and render the dispersion increasingly acidic. This drives the particles to the bubble surface where they form a type of “armor” against further dissolution (see picture).