用自行设计的、用于观测由透明均匀相中生成超微粒子的激光测试仪，对水解法制备纳米TiO2的过程进行了研究，并设定了一系列反应过程的内在参数，如成核温区△T，成核时间△t，反应成核浓度的参数I／I0等，并记录了这些参数及有关曲线，讨论了这些参数与最后产物性质的关系，研究了反应初始条件如浓度、酸度和阴离子等外部因子的改变对这些参数的影响，以及对最终产物性质（粒子大小、晶型结构）的影响，获得了金红石含量高，粒子直径在100nm的超细TiO2粉体．
The preparing process of TiO2 superfine particles from homegeneous solutions was investigated by a new instrument designed
(China patent). The effect of pH, concenteration of reactant, anions present on the characteristics of final products was discussed, and
rutile TiO2 particles about 100nm were obtained. With this instrument, the hydrolysis process can directly be recorded. The beginning time (t1)
and temperature (T1) of hydrolysis, the parameters of I/I0 (generated nucleus concentration), Δ T (nucleus-forming temperature range),
Δ t (nucleus-forming time range) can also be recorded. The relationship between generated nucleus concentration and temperature, time in
different conditions was obtained. It is shown that the changes of reactant concentration and pH values, anion cause the variety of t1, T1, Δ t,
Δ T. The characteristics (size, crystalline) of the product depend on these parameters. The higher the beginning temperature of the hydrolysis,
and the narrower the temperature range, the faster the hydrolysis reaction, the smaller the particles size and the more difficult the crystalline transforming.
参考文献
| [1] | |
| [2] | Egon Matizevic, Louis Meites. J. of Colloid and Interface Science 1977, 6 (2): 302--311 2 于网林、杨丰等，高等学校化学学报， 1994, 15 (11): 1686--1689 3 裴润等. 《硫酸法钛白生产》，化学工业出版社，1982年出版 4 Egon Matizevic, Pure & |
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