Preparation of colloidal metal particles

Numerous ways of particle preparation may be divided into two main groups, one including physical and the other-chemical approaches. In the first group, metallic nanoparticles are either assembled from atoms in the process of metal vaporization and subsequent condensation on various supports, or obtained through the treatment of the bigger particles in colloidal dispersions by means of colloidal nulls. 

2) stabilizers forming micellar solutions where aggregation process takes place in the aqueous core of reverse micelles and growing particles are surrounded by the surfactant molecules [9], 

The preparation of nanomaterials is one of the most active fields in material science. Number of techniques have been used for the production of nanoparticles gas-evaporation [11], sputtering [12], sol-gel method [13], hydrothermal [14], microemulsion [15, 16], polyols [17], laser pyrolysis [18], sonochemical synthesis [19], chemical coprecipitation [20-22], and so on. Among them, the surfactant assembly mediated synthesis is attracting more attention because it allows for a good 

Conventional magnetic metal powders, with a microscopic grain size, are usually obtained by mechanical attrition, atomization, condensation of metal vapor, electrol3dic decomposition from solution, reduction of metal compounds, centrifugal atomization, decomposition of metal hydrides, etc. Hyperfine metals prepared by chemical method which offers the following principal advantageous [35]  

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Electron transfer processes leading to a product adsorbed in the interfacial region o are of practical interest. These processes include the deposition of a metal such as Cu or Pd at ITIES, the preparation of colloidal metal particles with catalytic properties for homogeneous organic reactions, or electropolymerization. 

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