摘要：以醋酸锌(Zn(CH3COO)2·2H2O)和氨水(NH3.H2O)为反应物,对比运用微通道和搅拌釜为反应器时所得产物氧化锌形貌的差别。运用同轴环管微通道作为反应器经过水热过程合成一种直径在0.5~1μm,长度在20~30μm左右新型的棒状氧化锌材料。结果表明,以搅拌釜为反应器得到的产物为不均匀的纳米颗粒,经过水热过程后转变成为直径在1μm左右的均匀星状结构。以在线高速照相机来观察液体在微通道中的流动状态,发现其为均匀的层流流动,讨论运用微通道合成氧化锌的成核和生长机理。
关键词：微通道反应器；搅拌釜；纳米材料；水热合成
Abstract：A microfluidic channel reactor and a stirring reactor were introduced to synthesize ZnO particles by using Zn(CH3COO)2·2H2O dissolved in ethylene glycol and ammonia liquor solution as feedstocks.The results showed that after the hydrothermal treatment,the products synthesized by microfluidic channel reactor were rod-liked ZnO particles with a length of 20~30 μm and a diameter of 0.5~1μm.When Zn(CH3COO)2·2H2O was dropped in the ammonia liquor solution into a stirring reactor,the morphology of the products was nonuniform nano-particles,and it changed into star-liked structure with a diameter of 1 μm after the hydrothermal treatment.To observe the fluid flow in the microchannel reactor,an online high-speed camera system was used.The images showed that the flow in the channel was a laminar flow.The mechanism of zinc oxide nucleation and growth was proposed.
Keywords： microfluidic channel reactor；stirring reactor；nano-sized materials；hydrothermal synthesis
