Fig. 2
Controlled polymerization by emulsion droplets. a Reaction scheme of COF-TAPB–PDA from 1,3,5-Tris(4-aminophenyl)benzene (TAPB) and P-phthalaldehyde (PDA). b, c SEM images of Amor-TAPB–PDA colloidal particles produced under the polymerization temperature of 70 °C; d TEM image of Amor-TAPB–PDA colloidal particles produced under the polymerization temperature of 70 °C; e, f SEM images and TEM image (g) of COF-TAPB–PDA spheres after crystallization process. h, i TEM images of Amor-TAPB–PDA (h) and COF-TAPB–PDA (i) hollow spheres, respectively. j, k SEM image of Amor-TAPB–PDA (j) and COF-TAPB–PDA (k) hollow spheres, respectively. l The schematic reprsentation of COF-TAPB–PDA. m One-dimensional SAXS profile of Amor-TAPB–PDA and COF-TAPB–PDA colloidal particles produced under the polymerization temperature of 70 °C. Curve of COF-TAPB–PDA shows the d = 2π/q = 3.3 nm at 1.9 nm−1. n N2 adsorption–desorption isotherms of Amor-TAPB–PDA and COF-TAPB–PDA produced under the polymerization temperature of 70 °C. The BET surface areas of the corresponding COF-TAPB–PDA and Amor-TAPB–PDA are calculated to be 649.0 and 54.5 m2/g, respectively. Scale bar: b, e, h, i, j 500 nm; c, d, f, k 100 nm; g 50 nm
