Chemical reactions at nanometal particles

摘要

The concept of nanochemistry and the reactions involved are discussed. The work is focused on nanoparticles obtained from colloidal dispersions. The colloidal particles by transmission electron microscopy of low and high resolution were analyzed. The high resolution electron miscroscopy (HRTEM) allow us to classify the nanostructure of the metal particles in some polyhedral models: cubooctahedron, truncated octahedron, tetracai decahedron and icosahedron. Some HRTEM of Pd-2 propanol and Ge-2-propanol are analyzed. The Pd atoms exhibit a high crystalline nanoparticles, cubooctahedral arrangement in the [001] orientation. On the other hand, the Ge atoms are ordered in a pseudohexagonal arrangement. The spacing in the last system are typical of a diamond cubic Ge structure.