气相爆轰反应中纳米TiO_(2)颗粒的动态收集及微观生长机制  

Dynamic Collection and Micro-Growth Mechanism of TiO_(2) Nanoparticles in Gaseous Detonation Reaction

作　　者：赵铁军 王自法[1] 闫鸿浩 王小红[2] 李晓杰[2] ZHAO Tiejun;WANG Zifa;YAN Honghao;WANG Xiaohong;LI Xiaojie(School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,Henan,China;Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]大连理工大学工程力学系,辽宁大连116024

出　　处：《高压物理学报》2021年第5期40-45,共6页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11672068)。

摘　　要：在气相爆轰制备纳米TiO_(2)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TiO_(2),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TiO_(2),且网台上TiO_(2)的粒径明显小于管壁上收集的TiO_(2)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TiO_(2)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。During the preparation of nano TiO_(2) particles via the gaseous detonation method,a portable nanopowder collection platform was located inside the gaseous detonation tube where the nano-TiO_(2) 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 TiO_(2) powders collected from platform and detonation tube wall consisted of rutile and anatase phases,and the particle size of TiO_(2) 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 TiO_(2) 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.

关 键 词：气相爆轰法 生长机制 动态收集 纳米颗粒 二氧化钛 

分 类 号：O389[理学—流体力学]