摘要
利用多重射流氢氧燃烧反应器,以AlCl3为前驱体制备了具有不同形貌和晶型结构的Al2O3纳米颗粒,表征了其形貌、晶型结构、比表面积、粒径分布等性能,考察了火焰燃烧形式和反应区最高温度等因素对颗粒性能的影响规律.结果表明,随反应温度升高,Al2O3粒径不断长大,形貌从具有链状结构的不规则颗粒逐渐转变为分散性良好的球形颗粒;同时随反应温度升高和在高温火焰中停留时间延长,晶型由单纯γ相逐渐转变为δ和δ*相.产品纳米Al2O3颗粒具有较强亲水性,其分散液具有较好的稳定性.探讨了高温快速反应过程中颗粒和团聚体的生长机理,最终产物的粒径和团聚体形貌取决于各主要影响条件的相互竞争.
Nano-Al2O3 particles were prepared via H2/air flame synthesis in a multi-jet reactor with anhydrous AlCl3 as precursor,the morphology,structure,crystallinity,size and specific surface area of the prepared nanoparticles were investigated,and the influences of flame configuration and maximum temperature in the reaction zone on their properties characterized.The results showed that the size of particles increased with the flame temperature increasing,and their morphology changed from irregular chain-like aggregates to well dispersed spherical nanoparticles.At the same time,a simple γ-phase was gradually transformed to δ and δ＊ phases.Dispersion of nano-Al2O3 particles had strong stability.The growth mechanism of particles and aggregates at rapid high-temperature reaction was discussed.The morphology and particle size of prepared nanoparticles depended on the competition among the key influential factors.
出处
《过程工程学报》
CAS
CSCD
北大核心
2011年第1期137-142,共6页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20925621
20706015
20906027)
上海市启明星计划基金资助项目(编号:09QH1400700)
上海市重点实验室专项基金资助项目(编号:09DZ2202000
10DZ2211100)
上海市纳米专项基金资助项目(编号:0952nm02000
0952nm02100
1052nm02300)
关键词
多重射流燃烧
纳米氧化铝
晶相转变
生长机理
multi-jet flame combustion
nano-Al2O3
phase transformation
growth mechanism
