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http://dx.doi.org/10.14478/ace.2011.22.6.685

Solvothermal Preparation of Nanocrystalline TiO2 Using Alcohol-water Mixed Solvent  

Lee, Sang Geun (Department of Industrial Chemistry, Pukyong National University)
Park, Seong Soo (Department of Industrial Chemistry, Pukyong National University)
Hong, Seong Soo (Department of Chemical Engineering, Pukyong National University)
Park, Jong Myung (Graduate Institute of Ferrous Technology, Pohang University of Science and Technology)
Lee, Seung Ho (Composite Materials Center, Korea Institute of Ceramic Engineering & Technology)
Kim, Dae Sung (Composite Materials Center, Korea Institute of Ceramic Engineering & Technology)
Lee, Gun Dae (Department of Industrial Chemistry, Pukyong National University)
Publication Information
Applied Chemistry for Engineering / v.22, no.6, 2011 , pp. 685-690 More about this Journal
Abstract
In this study, a solvothermal reaction to prepare nanocrystalline titania was carried out using $TiCl_4$ and mixed solvents of alcohol and water. The effects of the type and the composition of alcohol on the crystal structure and agglomeration of final $TiO_2$ products were investigated. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) as well as scanning electron microscopy (SEM). In the solvothermal reaction using the n-butanol solutions with different volume ratios of n-butanol/water (100/0, 75/25, 50/50, 25/75, 0/100), the extent of agglomeration of obtained rutile $TiO_2$ was found to change with the volume ratio of n-butanol/water, and the n-butanol/water ratio of 75/25 revealed the best result for the preparation of well-dispersed nanocrystalline $TiO_2$ powders. The crystal phase of $TiO_2$ prepared through the solvothermal reaction changed with the type of alcohol in solvent (alcohol/water = 75/25). $TiO_2$ products obtained with the aqueous solutions of methanol, ethanol and isopropanol have an anatase phase, while that with n-butanol has a rutile phase. The results showed that, in the solvothermal reaction using both $TiCl_4$ as a starting material and the alcohol-water mixed solvents without any other additive, the enhancement of dispersion and control of crystal structure of $TiO_2$ products can be feasible by simply varying the composition and type of alcohol in the mixed solvents.
Keywords
solvothermal; mixed solvent; alcohol-water; titania;
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