TY - JOUR
T1 - Controlling the crystal morphology of mesoporous silica SBA-1
AU - Chao, Man Chien
AU - Lin, Hong Ping
AU - Wang, Da Shin
AU - Tang, Chin Yuan
N1 - Funding Information:
Authors thank Prof. Chung-Yuan Mou for many worthy discussions on this paper. The research was financially supported by the National Science Council of Taiwan (NSC93-2113-M-006-003 and NSC93-2323-B-006-009).
PY - 2005/9/1
Y1 - 2005/9/1
N2 - The SBA-1 mesoporous silica of Pm3̄n symmetry with different pore sizes have been conveniently prepared from a dilute aqueous solution of C nTMAX (n = 14-18, X = Br, Cl) and sodium silicate at pH value of 2.0. A mesophase transformation from cubic Pm3̄n to hexagonal p6mm occurs at relatively high surfactant concentration of about 6.0 × 10-2 M. Moreover, a slow self-assembling reaction in a dilute solution leads to the formation of the mesostructural SBA-1 crystals. The SBA-1 crystal shape also changes with the chain length of the surfactant. Basically, crystallization processes are thermodynamically and kinetically controlled. Many synthetic factors (such as pH value, silica/surfactant ratio, concentration of the surfactant and temperature) which can influence the silica condensation rate, surfactant micellization and surface free energy of the crystal have apparent effects on the crystal morphology of the SBA-1 mesoporous silica. The organic silica source (tetraethyl orthosilicate, TEOS) can serve as an alternative silica source to obtain the SBA-1 mesoporous silica crystals, but a longer aging time is needed than that of acidified sodium silicate.
AB - The SBA-1 mesoporous silica of Pm3̄n symmetry with different pore sizes have been conveniently prepared from a dilute aqueous solution of C nTMAX (n = 14-18, X = Br, Cl) and sodium silicate at pH value of 2.0. A mesophase transformation from cubic Pm3̄n to hexagonal p6mm occurs at relatively high surfactant concentration of about 6.0 × 10-2 M. Moreover, a slow self-assembling reaction in a dilute solution leads to the formation of the mesostructural SBA-1 crystals. The SBA-1 crystal shape also changes with the chain length of the surfactant. Basically, crystallization processes are thermodynamically and kinetically controlled. Many synthetic factors (such as pH value, silica/surfactant ratio, concentration of the surfactant and temperature) which can influence the silica condensation rate, surfactant micellization and surface free energy of the crystal have apparent effects on the crystal morphology of the SBA-1 mesoporous silica. The organic silica source (tetraethyl orthosilicate, TEOS) can serve as an alternative silica source to obtain the SBA-1 mesoporous silica crystals, but a longer aging time is needed than that of acidified sodium silicate.
UR - https://www.scopus.com/pages/publications/28844440823
UR - https://www.scopus.com/pages/publications/28844440823#tab=citedBy
U2 - 10.1016/j.micromeso.2005.05.007
DO - 10.1016/j.micromeso.2005.05.007
M3 - Article
AN - SCOPUS:28844440823
SN - 1387-1811
VL - 83
SP - 269
EP - 276
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-3
ER -