Dynamic Collection and Micro-Growth Mechanism of TiO2 Nanoparticles in Gaseous Detonation Reaction
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摘要: 在气相爆轰制备纳米TiO2实验中，将设计的可移动纳米粉体收集网台内置于爆轰管内，收集到了爆轰反应过程中生成的纳米TiO2，首次采用实验的方法探讨了气相爆轰制备纳米颗粒的生长机制。经分析发现，网台上与爆轰管壁收集的粉体为金红石相与锐钛矿相TiO2，且网台上TiO2的粒径明显小于管壁上收集的TiO2粒径。网台到爆轰管尾端的距离对颗粒尺寸影响非常显著，距离越近，纳米TiO2的粒径越小。结合爆轰波/冲击波在爆轰管中的传播规律，基于实验观察，进一步揭示了气相爆轰合成纳米颗粒的生长机制。Abstract: During the preparation of nano TiO2 particles via the gaseous detonation method, a portable nano-powder collection platform was located inside the gaseous detonation tube where the nano-TiO2 powders were collected based on the detonation reaction. The growth mechanism of gaseous detonation preparing nanoparticles was investigated experimentally for the first time. The results demonstrated that the TiO2 powders collected from platform and detonation tube wall consisted of rutile and anatase phases, and the particle size of TiO2 from platform is much smaller than that of tube wall. The particle size was significantly affected by the distance from platform to the end of detonation tube, and the closer the distance, the smaller the TiO2 particle size. The growth mechanism of nanoparticles prepared via gaseous detonation method was revealed based on the theory of detonation/shock wave propagation and experimental observation in detonation tube.
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Key words:
- gaseous detonation method /
- growth mechanism /
- dynamic collection /
- nano particles /
- TiO2
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图 3 爆轰管内收集的纳米粉体的XRD谱
Figure 3. XRD pattern of nano powders collected from gaseous detonation tube
图 4 气相爆轰制备的纳米粉体的TEM图像：(a)显示了无可移动收集网台时气相爆轰管收集的纳米颗粒，(b)、(c)、(d)分别显示了可移动收集网台距爆轰管尾端160、320和640 mm时收集的纳米颗粒
Figure 4. TEM images of nano powders prepared by gaseous detonation: (a) Nano powders collected from gaseous detonation tube without collection device; (b), (c), (d) Nano powders on the removable nano powder collection platform at 160, 320, 640 mm away from the end of gaseous detonation tube
图 5 氢-氧爆轰反应的高速摄影图像
Figure 5. Photos on the hydrogen-oxygen detonation reaction by the high-speed photography
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