Preparation of Copper Particles in Concentric Microreactor and Bach Reactor

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  • Kimata Mitsumasa
    Department of Chemistry and Chemical Engineering, Yamagata University
  • Hirohara Kiwako
    Department of Chemistry and Chemical Engineering, Yamagata University
  • Matsuda Keigo
    Department of Chemistry and Chemical Engineering, Yamagata University
  • Hasegawa Masahiro
    Department of Chemistry and Chemical Engineering, Yamagata University

Abstract

Copper particles were synthesized in a batch reactor and concentric microreactor by the reduction-precipitation method. The products were observed by scanning electron microscopy, and their composition and crystal structure were measured by energy dispersive X-ray spectroscopy elemental analysis and powder X-ray diffraction (XRD), respectively. Spherical copper nanoparticles were prepared using a concentric microreactor. It was found that these particles had diameter less than 100 nm and contained copper and cuprous oxide. In addition, polyhedral particles were prepared in the batch reactor. Cubic particles could also be synthesized under certain conditions, and the size of the polyhedral and cubic particles was about 1 μm. Compared with the microreactor, the batch reactor produced particles that were larger and more varied in shape. However, the crystal structure of the particles prepared in each type of reactor was similar, as determined by XRD. The oxygen content changed with reaction time and the molar ratio of the reactants.

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