Preparation of titania particles by thermal hydrolysis of TiCl4 in n-propanol solution
Preparation of titania particles by thermal hydrolysis of TiCl4 in n-propanol solution
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DOI：
10.1016/s0254-0584(02)00416-9
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发表时间：
2003-02
影响因子：
4.6
通讯作者：
Chiachen Fang;Yu‐Wen Chen
中科院分区：
文献类型：
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作者：
Chiachen Fang;Yu‐Wen Chen
二氧化钛在颜料、化妆品、光催化剂、涂料等领域有着广泛的应用。据报道，粒度分布较窄的球形粉末是最理想的状态。本研究以正丙醇和水为混合溶剂，以TiCl4为原料，采用热解法制备了二氧化钛粉末。考察了合成温度、反应物浓度、醇水比、空间分散剂浓度等制备工艺参数的影响。采用羟丙基纤维素(HPC)作为空间分散剂。沉淀物的形态受溶剂的介电常数控制。这可以通过改变混合溶剂的正丙水体积比(RH比)来调节。在RH比为3的条件下合成的二氧化钛样品呈球形，分散均匀。添加高性能混凝土使颗粒更加均匀分散。不同固含量的二氧化钛颗粒均为球形，但颗粒尺寸随固含量的增加而增大。合成温度越高，二氧化钛颗粒越不均匀。溶剂中温度梯度的影响对二氧化钛的形貌有重要影响。
Titania has been used extensively in pigment, cosmetics, photocatalyst and coating. It has been reported that the spherical powders with a narrow size distribution is the most desired state. In this study, titania powders were synthesized by thermal hydrolysis of TiCl4in a mixed solvent of n-propanol and water. The effects of preparation parameters such as synthesis temperature, the concentration of reacting species, the alcohol/water ratio, and the concentration of steric dispersant, were investigated. Hydroxypropyl cellulose (HPC) was used as a steric dispersant in this study. The morphology of the precipitates was controlled by the dielectric constant of the solvent. This can be regulated by changing the volume ratio of n-proponal to water (RH ratio) of the mixed solvent. The titania sample synthesized at an RH ratio of 3 was spherical and uniform-dispersed. Adding HPC made particles more uniformed-dispersed. The titania particles in different solid contents were all spherical, but the particle size increased with an increase of the solid content. The titania particles became not uniform at high synthesized temperature. The effect of the temperature gradient in the solvent plays an important role on the morphology of TiO2.