Figure 8.

Examples of discrete segment and droplet microreactors for the synthesis of porous silica sphere. (A) Microfluidic assembly of armored bubble-like colloidal silica by dissolving CO₂. Reproduced with permission from ref.⁸⁵. (B) Generation of monodisperse mesoporous silica microspheres using microfluidic diffusion-induced self-assembly. Reproduced with permission from ref.⁸². (C) Microfluidic fabrication of silica nanoparticles-shelled bubbles using air-in-oil-in-water (A/O/W) compound bubbles as templates. Reproduced with permission from ref.⁹². (D) Schematic illustration of the double emulsion generation process in a double microcapillary device (top) and the formation of colloidosomes by solvent removal (bottom). Reproduced with permission from ref.⁹⁷. (E) Template-free preparation of mesoporous silica spheres through a double step-emulsification microfluidic device. Reproduced with permission from ref.⁹⁰. (F) Schematic illustration of the droplet microfluidic approach for preparing monodisperse hollow silica microsphere through interfacial polymerization in water-in-oil droplets. Reproduced with permission from ref.⁸⁷.