Fig. 4. Monodisperse CP-MSs with different diameter preparation by regulating flow rates and flow rate ratio of oil and water phases. Fluorescence microscope images of CP-MS-1 (a), CP-MS-2 (b), CP-MS-3 (c), CP-MS-4 (d), CP-MS-5 (e), and CP-MS-6 (f) by staining with the FITC dye. Scale bar: 400 μm. (g) Statistical diagram of CP-MSs with different diameters, the X-axis is the water flow rate, the Y-axis is the oil flow rate, and the Z-axis is the diameter of the CP-MSs.