Formation of Closed Pores in Mesoporous Silica Nanoparticles by Hydrothermal Treatment

Mesoporous silica nanoparticles (MSNs) with closed pores have significant potential for applications such as low-dielectric-constant materials and bio-imaging owing to their controlled accessibility. In this study, we successfully prepared MSNs with closed pores by a simple hydrothermal treatment in ethanol. The mesostructure changed from open to closed mesopores through hydrothermal treatment. This simple method enabled the preparation of closed pores with encapsulated guest species. Mesoporous silica nanoparticles (MSNs) with closed pores have great potential for specific applications such as low-dielectric-constant materials and bioimaging careers owing to their controlled accessibility. In this study, we have succeeded in the preparation of MSNs with closed pores by a simple hydrothermal treatment in ethanol.