Abstract:

A series of highly ordered mesoporous silica nanoparticles (MSNs) with tunable particle sizes were synthesized by a direct cocondensation method. The hydrothermal posttreatment was adopted to improve the structure order of the materials characterized by small angle Xray diffraction (SAXRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and N2 adsorptiondesorption measurements. Then the highly ordered MSNs with tunable particle sizes from 80 nm to 320 nm were successfully prepared by changing the amount of TEOS and NH₃·H₂O. The results show that all the samples with wellordered mesoporous structures are typical MCM41 type mesoporous silica materials.

Key words: MSNs, particle size, cocondensation method, hydrothermal posttreatment