Abstract
A new process for the preparation of ultrafine particles (UFP) of metals was developed by means of a rapid vapor condensation technique. In this method, the evaporated metal vapor was rapidly condensed by a cold fluid (such as liquid N 2 or liquid CO 2 ) and then deposited into a trap or a cyclone before being coalesced. The size of particles obtained by this method (Ag, Cu, Au, Fe-Ni, Pd-Si) was very fine (about 10-50 nm in diameter) and the size distribution was quite sharp
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