Nanografi Nanotechnology

The preparation of metallic nanoparticles by pyrolysis was discussed in the last article, metallic nanoparticles part III (pyrolysis). We saw how different metallic, metallic oxide nanoparticles and nanocomposite can be prepared by the transformation of the precursor solution into aerosols and the evaporation of solvent by excessive heat to form solid particles. Here we take a look at gas condensation method for the preparation of the metallic nanoparticles. Inert gas condensation is one of the first and easiest methods for the synthesis of metallic nanoparticles. There are two steps in gas condensation. First, a metallic or inorganic material is vaporized using evaporation sources. Second, a rapid controlled condensation is done to produce the required particle size. Evaporation of the source can be done by thermal evaporation, laser vaporization, sputtering, electrical arc discharge or plasma heating. The rapid condensation is achieved by collecting the particles on a cold surfa...