Spatiotemporal distribution of thermal plasma temperature and precursor formation in a torch during TiO2 nanopowder synthesis
Spatiotemporal distribution of thermal plasma temperature and precursor formation in a torch during TiO2 nanopowder synthesis
复制标题
TiO2 纳米粉末合成过程中热等离子体温度和前驱体形成的时空分布
DOI：
10.1088/1361-6595/aa73ca
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发表时间：
2017
影响因子：
3.8
通讯作者：
Nakamura K
中科院分区：
文献类型：
--
作者：
Kodama Naoto;Tanaka Yasunori;Kita K;Ishisaka Y;Uesugi Y;Ishijima T;Sueyasu S;Nakamura K
利用电感耦合热等离子体炬（ICTP）合成TiO 2纳米粉体，利用二维光发射光谱（2D OES）研究了Ti激发温度（Tex Ti）的时空分布。将钛原料粉末间歇地注入ICTP火炬中，以动态地阐明原料的蒸发以及原子蒸气、前体分子和粒子核的形成。光谱观测结果表明，Tex Ti在ICTP火炬中心轴周围的估计值为2500-4000 K，在离轴区域超过4500 K。在轴上区域，TiO被检测到在较低温度区域具有高辐射强度。这些结果表明，TiO分子仅在ICTP火炬中心轴周围的低温区域形成。此外，TiO分子密度可能很高，特别是在ICTP火炬中心轴的下游区域。
The spatiotemporal distribution of Ti excitation temperature (Tex Ti) was determined from twodimensional optical emission spectroscopy (2D OES) during TiO2 nanopowder synthesis using an inductively coupled thermal plasma (ICTP) torch. The Ti feedstock powder was injected intermittently into the ICTP torch to elucidate the evaporation of the feedstock and the formation of atomic vapour, precursor molecules, and particle nuclei dynamically. The spectroscopic observation results revealed that Tex Ti was estimated as 2500–4000 K around the central axis of the ICTP torch, and more than 4500 K in the off-axis region. In the on-axis region, TiO was detected with a high radiation intensity in the lower temperature region. These results showed that TiO molecules are formed only in the low temperature region around the central axis of the ICTP torch. In addition, TiO molecular density could be high, especially in the downstream region at the central axis of the ICTP torch.