Nanoparticle synthesis using two-coil tandem-type modulated induction thermal plasmas
Nanoparticle synthesis using two-coil tandem-type modulated induction thermal plasmas
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DOI：
10.1016/j.powtec.2021.05.057
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发表时间：
2021-09
影响因子：
5.2
通讯作者：
R. Furukawa;Yasunori Tanaka;Y. Nakano;K. Akashi;T. Ishijima;Shu Watanabe;S. Sueyasu;K. Nakamura
中科院分区：
文献类型：
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作者：
R. Furukawa;Yasunori Tanaka;Y. Nakano;K. Akashi;T. Ishijima;Shu Watanabe;S. Sueyasu;K. Nakamura
本报告描述了实验获得的结果，纳米粒子合成使用双线圈串联型调制感应热等离子体（串联-MITP）。所开发的串联MITP是由两个线圈独立调制的高频线圈电流。Tandem-MITP可以在热等离子体中提供独特的时空控制高温场，以及等离子体炬下游区域周围热等离子体的高速淬火。热等离子体的这种高速淬火可以促进蒸发的原料蒸气的过饱和，导致纳米颗粒成核。首先，如本文所述，使用单MITP和串联MITP进行Fe 3+掺杂的TiO 2纳米颗粒合成。单MITP是一种传统类型的感应热等离子体，由一个线圈与调制的高频线圈电流操作。结果表明，采用串联MITP可以合成出比单一MITP更小的纳米颗粒，这是因为具有较大调制的串联MITP可以在关断时间提供较低的温度场，从而抑制颗粒的生长。此外，采用串联MITP法制备的纳米TiO 2具有较好的可见光催化性能。这一发现表明串联MITP适合于高速率生产金属离子掺杂的纳米颗粒。
This report describes experimentally obtained results on nanoparticle synthesis using two-coil tandem-type modulated induction thermal plasma (tandem-MITP). The developed tandem-MITP is operated by two coils with independently modulated high-frequency coil current. Tandem-MITP can offer unique temporo-spatially controlled high-temperature fields in thermal plasmas, as well as high-rate quenching of thermal plasma around the downstream region of the plasma torch. This high-rate quenching of the thermal plasma can promote supersaturation of evaporated feedstock vapour, resulting in nanoparticle nucleation. First, as described herein, Fe3+-doped TiO2nanoparticle synthesis was conducted using single-MITP and tandem-MITP. The single-MITP is a conventional type of induction thermal plasma that is operated by one coil with modulated high-frequency coil current. Results show that a smaller nanoparticle can be synthesized using tandem-MITP than by single-MITP because the tandem-MITP with larger modulation can offer a lower temperature field during off-time, which can engender suppression in particle growth. In addition, nanoparticles synthesized by tandem-MITP were found to have sufficient doping of Fe3+on TiO2for photocatalytic properties by visible light. This finding suggests tandem-MITP as suitable for high-rate production of metallic ion doped nanoparticles.