Figure 1.

Characterization of MSNPs by SEM and TEM.

Notes: MSNPs of different sizes were synthesized using a modified Stöber reaction. The morphology of the MSNPs was observed by SEM (A, C) and TEM (B, D). The results showed that the two preparations of MSNPs displayed uniform size: 253–281 nm for 250 nm MSNPs (A, B) and 37.5–62.2 nm for 30 nm MSNPs (C, D), and were spherical.

Abbreviations: MSNPs, mesoporous silica nanoparticles; SEM, scanning electron microscopy; TEM, transmission electron microscopy.