Control of particle size and phase formation of TiO2 nanoparticles synthesized in RF induction plasma
Control of particle size and phase formation of TiO2 nanoparticles synthesized in RF induction plasma
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DOI：
10.1088/0022-3727/40/8/s14
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
J. Li;M. Ikeda;R. Ye;Y. Moriyoshi;T. Ishigaki
中科院分区：
文献类型：
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作者：
J. Li;M. Ikeda;R. Ye;Y. Moriyoshi;T. Ishigaki
在这项工作中，通过Ar/O2 RF热等离子体氧化的雾化液体前体含有四丁氧基钛和二乙醇胺，二氧化钛纳米粒子已合成。淬火气体（Ar或He），从反应器的肩部注入（横向注入）或从反应器的底部与等离子体羽流相反地注入（逆流注入），用于影响淬火速率并因此影响所得粉末的粒度和相组成。实验结果表明，逆流喷射能更有效地减小颗粒尺寸，而He比Ar更有效。结果表明，制备的TiO 2纳米粉体分散性好，相结构可控，平均粒径可达20 nm左右。数值分析了急冷气体对热等离子体流场、温度场以及粒子运动轨迹和温度历程的影响，为实验结果提供了有力的支持。
TiO2 nanoparticles have been synthesized in this work via Ar/O2 RF thermal plasma oxidation of atomized liquid precursors containing titanium tetrabutoxide and diethanolamine. Quench gases (Ar or He), either injected from the shoulder of the reactor (transverse injection) or injected counter to the plasma plume from the bottom of the reactor (counter-flow injection), are used to affect the quench rate and therefore the particle size and phase constituent of the resultant powders. The experimental results show that counter-flow injection is more effective in reducing the particle size, while He is more effective than Ar. As a result, well-dispersed TiO2 nanopowders with controllable phase structure (up to ∼90% of anatase) and average particle size (down to 20 nm) are obtained. The experimental results are well supported by numerical analysis on the effects of the quench gas on flow pattern and temperature field of the thermal plasma as well as trajectory and temperature history of the particles.