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Formation process of virus-like mesoporous silica nanoparticles. TEM images of the mesoporous silica nanoparticles prepared at different reaction times: (a) 6 h; (b) 12 h; (c) 18 h; (d) 24 h; (e) 36 h; (f) 48 h, respectively, in a biphase (cyclohexane and water) reaction system with a low CTAB-surfactant concentration. The insets are the structural models for the mesoporous silica nanoparticles. All the scale bars are 50 nm.
