Figure 6.

Schematic illustration of nanovalve-gated multifunctional mesoporous silica theranostics systems for loading and release of Hoechst 33342 molecules. (a,b) loading of Hoechst 33342, (c) zoomed particle's surface before capping and washing, (d) loaded Hoechst 33342 molecules in pores after capping and washing, (e) release of Hoechst 33342 molecules from the pores, (g-i) loading of dye molecules in different pore sizes of the nanoparticles and (h) chemistry of Hoechst 33342 molecule adsorbed on the silica surface. Reproduced with permission from J. Phys. Chem. C 2011, 115, 19496 published by American Chemical Society.