Using Micro Junction Device As Reactor For The Preparation Of Zinc Oxide Materials Research

Nano-materials is a crucial part of nanometer technology. The controllable synthesis ofnano-materials and their application ins in various areas have attracted increasing attention fromresearchers, and as a result, many amazing achievements have been reached. The preparation andapplication of new nanometer materials have become an important chemical research subject,many researchers have been devoting themselves to this field, and their research findings hasgreat significance for the developments of nanometer technology.The microstructure equipments can be used in synthesizing nano-materials, which havemany advantages, such as processing a reaction in small scale, accurately controlling the reactionconditions (e.g. temperature and pressure), quantitatively managing the degree of reaction, etc.The morphologies and properties of the products obtained by microstructure equipments aremuch more different from those obtained by general reactor. So, the use of microstructureequipments in the preparation of nano-materials makes the researches in this area moreopportunity and challenges.In this paper, we use the microfluidic channel reactor and membrane dispersion micro-structure reactor to synthesize ZnO products, and explore the products’ morphology andproperties.Using the microfluidic channel as reactor, we conducted the preparation of nano ZnO inhomogeneous system and liquid-liquid system respectively. In the homogeneous system, zincsulfate and ammonium bicarbonate were used as the reactants, water as the reaction medium, andCTAB as the surfactant. The products’ morphologies and the influences of reaction conditions,such as concentration of the reactants, rate of flow, and surfactants were investigated. Then, thehydrothermal progress was introduced after the microfluidic channel reactor, in order to produceproducts with better morphologies. The results show that the introduction of hydrothermalprogress greatly affects the products’ morphologies.In the liquid-liquid reaction system, the microfluidic channel reactor was applied and thetwo reactant solutions were zinc acetate glycol solution and ammonia water solution. The effectsof concentration of the reactants, flow velocity, and hydrothermal progress were alsoinvestigated. The results indicate that the hydrothermal progress may have great influence on theproducts’ morphologies, and rod-like zinc oxide obtained with uniform size. With the differentreactant concentration the zinc oxide morphologies change, the lengths of rod-like zinc oxidechange from1um rod into20um rod.Fininally, the membrane dispersion micro-structured reactor was used instead of themicrofluidic channel reactor. The reaction system was homogeneous phase reaction system, with the mobile phase being zinc sulfate and CTAB solution, and the dispersed phase beingammonium bicarbonate solution. The influence of the reactant concentration and surfactant onthe product’s morphology was investigated. Compared with the microfluidic channel reactor’slaminar form, in the membrane dispersion micro-structured reactor the liquid flow form isturbulent flow, which provides much better mixing properties and bigger reactingsupersaturation，and has great influence on the product properties.