TY - GEN
T1 - Preparation of size controlled nanometric spheres of colloidal silica for synthetic opal manufacture
AU - Escobedo, C. A.Cortés
AU - Muñoz-Saldaña, J.
AU - Vigueras, D. Jaramillo
AU - Beltrán, F. J.Espinoza
PY - 2006
Y1 - 2006
N2 - In this work, we present a modification of the sol-gel based, Stöber, Fink and Bohn's (SBF) procedure for the preparation of nanometric spheres of silica with a monomodal distribution of size and controlled diameter. In the SBF method, tetraethyl orthosilicate (TEOS) is used as a precursor molecule and hydrolysis and condensation reactions to form chains and branches of Si-O bonds are carried out. The novelty of this work consists in the use of an aqueous ammonium hydroxide solution as ammonia source. Graphics of particle size as a function of reagent contents are presented (reaction yield control) and differences to the results from the original SBF method are discussed. This procedure is the very first step for the development of a sol-gel synthetic opals preparation process. As a result, the best route to prepare monodisperse spheres in the whole range of 250 to 850 nm is that of keeping constant the TEOS and NH3 contents at 0.28:1M varying water contents in the range of 8-12.5 M.
AB - In this work, we present a modification of the sol-gel based, Stöber, Fink and Bohn's (SBF) procedure for the preparation of nanometric spheres of silica with a monomodal distribution of size and controlled diameter. In the SBF method, tetraethyl orthosilicate (TEOS) is used as a precursor molecule and hydrolysis and condensation reactions to form chains and branches of Si-O bonds are carried out. The novelty of this work consists in the use of an aqueous ammonium hydroxide solution as ammonia source. Graphics of particle size as a function of reagent contents are presented (reaction yield control) and differences to the results from the original SBF method are discussed. This procedure is the very first step for the development of a sol-gel synthetic opals preparation process. As a result, the best route to prepare monodisperse spheres in the whole range of 250 to 850 nm is that of keeping constant the TEOS and NH3 contents at 0.28:1M varying water contents in the range of 8-12.5 M.
KW - Monodisperse spheres
KW - Opals
KW - Silica
KW - Sol-gel
UR - http://www.scopus.com/inward/record.url?scp=35848938006&partnerID=8YFLogxK
U2 - 10.4028/0-87849-993-8.187
DO - 10.4028/0-87849-993-8.187
M3 - Contribución a la conferencia
SN - 0878499938
SN - 9780878499939
T3 - Materials Science Forum
SP - 187
EP - 192
BT - Advanced Structural Materials II - Proceedings of the Advanced Structural Materials Symposium of the Annual Congress of the Mexican Academy of Materials Science
PB - Trans Tech Publications Ltd
T2 - Advanced Structural Materials Symposium of the Annual Congress of the Mexican Academy of Materials Science, 2004
Y2 - 22 August 2004 through 26 August 2004
ER -