The effect of cetyltrimethylammonium bromide (CTAB) and ethanol on the size of mesoporous silica synthesized by stöber method
Paper ID : 1208-ICNS
Authors:
Fatemeh Behrouz *1, Najmeh Najmoddin2, Fatemeh Hajihashemi1
1Department of biomedical Engineering, Islamic Azad University Science and Research Branch, Tehran, Iran
2Biomedical engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
Abstract:
The present work is focused on the study of the particle size of mesoporous silica nanoparticles (MSNs) by changing the amount of surfactant (cetyltrimethylammonium bromide (CTAB)) and co-solvent (ethanol) at constant temperature (40˚C) synthesised by Stöber process from tetraethyl orthosilicate (TEOS) as precursor of silica and CTAB as pore generating agent. MSNs were characterized by field-emission scanning electron microscopy (FE-SEM). Two amount of CTAB (0.1 &0.28 mol) and three amount of ethanol (10, 20 & 30 mol) were used for synthesis process. The FE-SEM images indicated that by increasing the amount of CTAB from 0.1 to 0.28 mol, the size of nanoparticles decreased from 79.42 ± 7.8 nm to 40.37 ± 5.3 nm (at 10 mol EtOH) , 89.39 ± 8.1 nm to 67.25 ± 9.4 nm (at 20 mol EtOH) and from 104.64 ± 6.9 nm to 85.27 ± 17.3 nm (at 30 mol EtOH), but increasing the amount of ethanol from 10 to 30 mol, increased the size of nanoparticles from 79.42 ± 7.8 nm to 104.64 ± 6.9 nm (at 0.1 mol CTAB) and from 40.37 ± 5.3 nm to 85.27 ± 17.3 nm (at 0.28 mol CTAB). Consequently, Observations indicated that by increasing the amount of CTAB, particle size decreased while by increasing the amount of ethanol particle size increased.
Keywords:
Mesoporous silica; Particle size; Ethanol; CTAB; Stöber method
Status : Abstract Accepted (Poster Presentation)