Effect of Additives on Hydrolysis of Ti Alkoxide and Microstructural Observation of TiO2
By the usage of the hydrolysis of Ti alkoxide, various types of TiO2 were obtained through the addition of catalyst (HCl, NH4OH, and CH3COONH4) and some additives into Ti alkoxide solution at room temperature. In special, the effect of two additives, diethylene glycol (DEG) and hexamethylphospheric triamide (HMPA), on hydrolysis behaviors and microstructure with various catalyst for hydrolysis of Ti-tetraisopropoxide was in detail investigated. In case of TiO2 powder with HMPA as an additive, the crystallinity of TiO2 except with NH4OH as a catalyst decreased in XRD patterns, compared to those of products with no additive and with DEG as an additive. The addition of HMPA prohibited the growth of TiO2 and led to fine TiO2 with the average particle size of approximately 10nm.
T. Ohji, T. Sekino and K. Niihara
A. Nakahira et al., "Effect of Additives on Hydrolysis of Ti Alkoxide and Microstructural Observation of TiO2", Key Engineering Materials, Vols. 317-318, pp. 89-92, 2006