Proposal of flame synthesis method for nanoparticles using flash boiling spray (TiO2 particle characteristics influenced by injection condition and equivalence ratio)

Abstract

The nanoparticles whose diameter is less than 100 nm are used as the ceramics, electrical material and cosmetics. It is important to produce homogeneous characteristics of the particles for high performance property. The particle generation method to form homogeneous characteristics is difficult. The nanoparticle generation method with the flame has several advantages such as easy to accomplish high temperature by using simple apparatus construction and continuous produce. The authors proposed that the novel nanoparticle synthesis method by using flashing spray with flame in order to improve the problems. In this method the precursor and low boiling point organic solvent mixed solution is used as the start solution to improve the characteristics of the precursor evaporation characteristics. The injected solution from the nozzle is evaporated by flash boiling and form the homogeneous vapor. The nanoparticles are produced by the combustion energy of the flame. In this paper, the relationship between the flame and injection characteristics, and TiO2 particle characteristics were investigated to demonstrate the method. As the result, the particle distribution has two peaks as 0.1 and from 1 to 3 μm when the low injection frequency and the anatase phase of mass fraction increases by increasing injection frequency. The particle diameter distribution has wide distribution in the case of high equivalence ratio because the aggregation is promoted. The anatase phase of mass fraction changes at the equivalence ratio equal to 0.4, drastically.

Keywords

• nanoparticles
• flame synthesis method
• flash boiling spray
• injection frequency