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湍流效应是火焰合成纳米TiO_2颗粒工业化规模放大的一个重要影响因素。本文基于一种新提出的滞止旋流火焰开展了合成TiO_2纳米颗粒的实验研究。在旋流数0.26的条件下,可成功获得比表面积300 m~2/g以上,粒径最小达5nm的锐钛矿型TiO_2颗粒,这可归因于本文滞止旋流火焰具有贫燃稳定性、速度高反应快、温度梯度大等特点。实验还发现,随着前驱物浓度的减小,合成颗粒粒径逐渐减小且更加均匀。
Turbulence effect is an important factor in industrial scale expansion of flame-synthesized nano-TiO 2 particles. In this paper, an experimental study on the synthesis of TiO_2 nanoparticles based on a new stagnant swirling flame was carried out. Anatase TiO 2 particles with a specific surface area of 300 m 2 / g and a particle size of up to 5 nm can be successfully obtained at a swirl number of 0.26, which can be attributed to the fact that the stagnant swirling flame has a lean burn stability Sex, high speed, fast response, temperature gradient and so on. It was also found experimentally that as the precursor concentration decreases, the particle size of the synthesized particles gradually decreases and becomes more uniform.