Synthesis, characterization and organic modification of copper manganese oxide nanocrystals under supercritical water

Dinesh Rangappa, Satoshi Ohara, Mitsuo Umetsu, Takashi Naka, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Synthesis and in situ surface modification of copper manganese oxide nanoparticles have been carried out under supercritical water conditions. Flow type and batch type reactors were used in this study. Effect of different reactors on the phase formation was studied in detail. The addition of organic modifier into the reaction system has significant influence on the particle size, morphology and the dispersion of nanocrystal. The particle size was greatly reduced and single nanocrystal particles were formed by the in situ surface modification of nanoparticles with organic reagents during the synthesis. The surface modified particles showed a very high surface area when compared with unmodified particles. The particles are dispersed in a binary solvent system where organic-modified particles are dispersed in the upper organic solvent medium. In contrast, the particles without surface modification are settled down in the water phase.

Original languageEnglish
Pages (from-to)441-445
Number of pages5
JournalJournal of Supercritical Fluids
Volume44
Issue number3
DOIs
Publication statusPublished - 2008 Apr 1

Keywords

  • Catalyst
  • Copper manganese oxide
  • High surface area
  • Nanocrystals
  • Supercritical water
  • Surface modification

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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