Figure 7.

Examples of discrete segment and droplet microreactors for the synthesis of solid silica sphere. (A) Segmented gas-liquid flow microreactors with straight-walled channels (design 1) and meandering channels (design 2) for solid silica sphere synthesis. Number 2 is the gas inlet. Reproduced with permission from ref.⁴⁰. (B) Procedure and setup for the droplet-based synthesis of silica sphere. Reproduced with permission from ref.⁹⁹. (C) Droplet synthesis of silica microsphere. Reproduced with permission from ref.¹⁰⁸. (D) Microfluidic interdigital mixer used to produce the silica nanosphere by microchannel emulsification. Reproduced with permission from ref.¹¹⁷.