Isothermal Kinetics of Titanium-oxo-alkoxy Clusters Formation

被引：2

作者：

Baros, Z. Z. ^{[2
]}

Adnadevic, B. K. ^{[1
]}

Pavlovic, V. B. ^{[3
]}

机构：

[1] Univ Belgrade, Fac Phys Chem, Belgrade 11001, Serbia

[2] Belgrade Polytech, Higher Educ Sch Profess Studies, Belgrade 11000, Serbia

[3] Univ Belgrade, Fac Agr, Belgrade 11080, Serbia

来源：

SCIENCE OF SINTERING | 2011年 / 43卷 / 01期

关键词：

Titanium tetraisopropoxide; Isothermal kinetics; Hydrolysis; Titanium-oxo-alkoxy clusters formation; PARTICLE-SIZE; TIO2; POWDERS; HYDROLYSIS; SCATTERING; GROWTH;

D O I：

10.2298/SOS1101095B

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this article, the influences of titanium tetraisopropoxide Ti(OR)(4) (R = Pr-i) concentration, molar ratio, h = [H2O]/[Ti(OR)(4)], and temperature, on the formation kinetics of the titanium-oxo-alkoxy clusters (TOAC), were studied. The TOAC formation isothermal kinetics was monitored by measuring absorbance changes versus time in the reaction mixture at predefined wavelength lambda = 350 nm. It was determined that the isothermal rate of clusters formation is a power law function of titanium tetraisopropoxide concentration and the molar concentration of water (c(w)). The kinetic parameters alpha and beta were calculated. The apparent activation energy E-a values in the clusters formation reaction has been calculated and correlated with the change of titanium tetraisopropoxide concentration and molar ratio. The model for mechanism of TOAC formation is proposed.

引用

页码：95 / 104

页数：10

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