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A new phenomenon is described in this paper: the formation of macroscopic channel structures on the bottom of copper ingots which were used as the target for the synthesis of copper nanoparticles by high-power electron beam evaporation and condensation. In the synthesis experiment, the cylindrical copper ingot is melted and partially evaporated in a graphite crucible. The channel structures were originally observed after a series of nanoparticle synthesis experiments in varying conditions. In the present work, various process conditions are varied in order to recreate the structures and identify their mechanism of formation. Conditions in which the channel structures form and do not form are identified and interesting microstructures are observed near the channel structures. OPEN ACCESSMetals 2015, 5 429

Annotation This article presents data on the use of Janus-like and core-shell composite nanoparticles consisting of two substances—metal and semiconductor—in nanophotonics and spectroscopy. Investigations were carried out of the mechanism of formation of composite nanoparticles, based on the principle of minimum surface energy of the system and the results of molecular dynamics modelling. Integral representation was employed to analyse size distribution function of nanoparticles, and it was concluded that coagulation predominates during particle formation.

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