Preparation of (NH_4)_0.15 MoO_3 ultrafine particles by the phase transfer

摘要

In recent decades much attenation has been paid to study on ultrafine particles~1. Although the unusual properties of ultrafine particles and their mechanism of formation as well as their stabilization have attracted the attention of theoretical and experimental scientists in the last 10 years, the most of the studies was development of preparation method of ultrafine particles. Many methods have been developed, the evaporation-condensation in only suitable for preparation of metal ultrafine particles. The synthesis of oxdic ultrafine particles often adapts chemical method. A better synthetic method should be of following features~2: 1. Operation is simple and easily controlled. 2. The purity of product is very high, i.e. that of clean surface. 3. The cost is not too much. 4. the batch of product is larger. 5. The ultrafine particles prepared are of monodispersity and of rather stability. The monodispersity is very important for ultrafine particle application. Matijevic has made much progresses in this aspect~3.