TY - GEN
T1 - Kinetics of sol-gel transformation for the preparation of TiO2 ultrafiltration membrane
AU - Cao, Xue Ping
AU - Huang, Wei
AU - Jing, Wen Heng
AU - Xing, Wei Hong
PY - 2009
Y1 - 2009
N2 - The sol-gel technique is considered to be one of the most practical methods for producing ceramic membranes, and the properties of the sols could affect the microstructures of the desired products. Especially, optimized viscosity and a short gelation time can reduce the sol particles infiltrate into the pores of the support. So how to control the forming process of the gel is essential for fabricating the membranes. In this paper, we developed a kinetic equation of sol-gel transformation to study the relationships between viscosity and time of titanium sol systems by using N, N-Dimethylformamide (DMF) as solvent. Both the growth process of the sol particles and activation energy of the process were investigated according to the kinetic curves. The results indicate that the viscosity of sols decreases with the increment of R and temperature, but increases with rw, at the same time the gelation time decreases with rw, temperature and R. Furthermore, the growth of sol particles versus time accord with the NLG model, and the activation energy of gelation process decreased with R. When R changed from 2 to 6, the activation energy was decrease from 12.48KJ/mol to 9.35KJ/mol. According to the analysis of the results of the sol-gel transformation, a shorter gelation time could be obtained by increaseing the rw, R and the gelation' temperature.
AB - The sol-gel technique is considered to be one of the most practical methods for producing ceramic membranes, and the properties of the sols could affect the microstructures of the desired products. Especially, optimized viscosity and a short gelation time can reduce the sol particles infiltrate into the pores of the support. So how to control the forming process of the gel is essential for fabricating the membranes. In this paper, we developed a kinetic equation of sol-gel transformation to study the relationships between viscosity and time of titanium sol systems by using N, N-Dimethylformamide (DMF) as solvent. Both the growth process of the sol particles and activation energy of the process were investigated according to the kinetic curves. The results indicate that the viscosity of sols decreases with the increment of R and temperature, but increases with rw, at the same time the gelation time decreases with rw, temperature and R. Furthermore, the growth of sol particles versus time accord with the NLG model, and the activation energy of gelation process decreased with R. When R changed from 2 to 6, the activation energy was decrease from 12.48KJ/mol to 9.35KJ/mol. According to the analysis of the results of the sol-gel transformation, a shorter gelation time could be obtained by increaseing the rw, R and the gelation' temperature.
KW - Ceramic
KW - Sol-gel
KW - Titania
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=74049099759&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.79-82.1261
DO - 10.4028/www.scientific.net/AMR.79-82.1261
M3 - 会议稿件
AN - SCOPUS:74049099759
SN - 0878493042
SN - 9780878493043
T3 - Advanced Materials Research
SP - 1261
EP - 1264
BT - Multi-Functional Materials and Structures II
T2 - 2nd International Conference on Multi-Functional Materials and Structures, MFMS-2009
Y2 - 9 October 2009 through 12 October 2009
ER -