Research On Preparation Of Ultrafine SnO₂ Power By Sol-Gel Method Combined With Ultrasonic Wave

The properties, applications and preparation of ultrafine powder materials are reviewed on the basis of studying lots of literature at home and abroad. Ultrafine SnO2 powder, which has the surface structure and physical function, has been widely used in the fields of function ceramics, information materials and photosensitive materials as a new type of function materials and are comprehensively discussed in this paper. The distinctive functions of ultrasonic wave on the preparation of ultrafine powder materials are introduced and the ultrasonic wave-sol-gel method is determined in this paper to prepare ultrafine SnO2 powder.Based on the experimental results, the mechanism of ultrasonic wave inthis work has been proved and the problems existing in this work and the corresponding improvements have been pointed out. Then the influence of ultrasonic wave, reaction time and temperature on the quality of products has also been studied. Experimental results manifest that ultrasonic wave has the advantage of restraining the formation of greater grains and keep higher surface activation of the ultrafme powder in the preparation of the SnO2 powder.The basic technological process of preparation of ultrafine SnO2 powder is put forward according to ultrasonic wave combined with sol-gel method. In this process, SnCl4 solution is added and react with NH3 H2O under the use of ultrasonic wave, controlling the acidity pH, reaction time and temperature and the sol can be got. Then sol changes into gel. After washing, dehydration, drying and roasting the gel, ultrafine SnO2 powder can be obtained. Kinetics features and reunion problems in chemical method of producing single dispersing particles in liquid are discussed and some improvements are given. After extensive conditional experiments such as reactant concentration, acidity pH, temperature and time of reaction have been done, and the factors influencing the sol stability such as washing method, drying temperature and roasting temperature and time have been discussed, the best conditions in this work are given.Some properties of the product have been determined by TEM, XRD, IR and TG-DSC techniques. The conclusion is that ultrasonic waye-sol-gel method is a promising and recommendable technique for its simple procedure, lower cost and better properties of the products.