“…A clear ordered narrow pore structure for MSP1 and BTA@MSP1 is revealed by TEM images (Figure 3a,b) that is typical of the highly ordered two-dimensional hexagonal mesostructure of MSPs produced by the method in route 1, which aligns with previous reports in the literature. 35,36 Therefore, with our experimental setup, mesoporous silica particles have been successfully prepared. However, the TEM images of MSP2 and BTA@MSP2 (Figure 3c,d) do not clearly show their pore structures but reveal the perfect spherical nature of the particles.…”