摘要
利用喷雾热解技术，以二水合醋酸锌为前驱体合成ＺｎＯ超细粒子，研究了操作参数对粒子形态和组成的影响．研究发现，产物粒子分解程度随反应温度的提高，溶液浓度和流量的降低而增大，随压力的提高先增大后略有减小．粒子形态与分解程度密切相关，只有当分解程度高于９０％以上才能获得形态规则粒度均匀的产物粒子．确定本实验体系优化的工艺条件为：温度６５０～７５０℃，浓度０．２０～０．５０ｍｏｌ／Ｌ，流量２．０～５．０ｍＬ／ｍｉｎ，压力０．４５～０．５５ＭＰａ，在此条件下制得粒度２０～３０ｎｍ高纯六方晶系ＺｎＯ粒子．由理论计算和实验结果的比较推断粒子形成机理为一次粒子成核－分裂机理．
Ultrafine ZnO particles were prepared by spray pyrolysis method from the aqueous solution of zinc acetate dihydratc, and the influence of operation paramcters on the morphology and composition of the particles was investigated. The decomposition degree of particles inereased with reaction temperature,decreased with solution concentration and flow rate, and it firstly increased then slightly decreased with air pressure. The particle morphology was related closely with its decomposition degree, uniform sized particles were obtained only at decomposition degree above 90%. For the experimental system, optimum operation conditions were: reaction temperature 650-750℃, solution concentration 0.20￣0.50mol/L, solution flow rate 2.0￣5.0mL/min, air pressure 0.45￣0.55MPa. Pure hexagonal ZnO particles with uniform size of 20￣30nm were synthesized under these conditions. A primary particle nucleation-spliting mechanism was established on the base of theoretical analysis and experimental results.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第4期611-616,共6页
Journal of Inorganic Materials
基金
国家自然科学基金
关键词
喷雾热解
氧化锌
超细粒子
热分解
spray pyrolysis, zine oxide, ultrafine particles, thermal decomposition, primary particle
