The effect of cooling rate on the particle size of mesoporous silica
Paper ID : 1269-ICNS
rana mohammady shodja *
Department of Biomedical Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
The stӧber process is commonly used for synthesis of spherical silica particles using cetyltrimethyl ammonium bromide (CTAB) as surfactant, tetraethyl orthosilicate (TEOS) as precursor of silica and ammonium hydroxide (NH4OH). Since obtaining silica particles less than 20 nm is vital in some medical applications, the present study is focused on the effect of cooling rate on the particle size of mesoporous silica nanoparticles (MSNs). The samples were cooled in two states. In first method, after the sol-gel process, the samples were cooled at room temperature and in another method the samples were placed in an ice-filled container and the effect of freezing on the particle size were investigated. MSNs were characterized by field-emission scanning electron microscopy (FESEM). The results of FESEM images indicated that the average particle size of samples which were cooled at room temperature was 50.79±8.32 nm but using the ice container decreased the particle size to 19.45±4 nm.
Mesoporous silica; Cooling rate; Particle size
Status : Abstract Accepted (Poster Presentation)