Affordable Access

Publisher Website

Homogeneous and heterogeneous nucleations in the polyol process for the preparation of micron and submicron size metal particles

Authors
Journal
Solid State Ionics
0167-2738
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0167-2738(89)90222-1

Abstract

Abstract The polyol process concerns the preparation of metallic powders by reduction of inorganic compounds in liquid polyols; it essentially applies to cobalt, nickel, copper and precious metals. A general reaction on model has been established with a reaction via the solution: dissolution of the solid precursor; reduction in solution; homogeneous nucleation and growth of the metallic phase from the solution. In the standard conditions the cobalt, nickel and copper particles are isotropic, in the micron range with a narrow size distribution. These characteristics are explained by the homogeneous nucleation model with an effective separation between the nucleation and growth steps. The temperature effect is discussed in relation to this model. Heterogeneous nucleation can be substituted for homogeneous nucleation; it allows, to some extent, a control of the particle size in the submicron range.

There are no comments yet on this publication. Be the first to share your thoughts.