Effect of Na4O7P2 on Cu powder preparation from Cu2O-water slurry system

J. G. Ahn, T. H. Hoang, D. J. Kim, M. S. Kim, C. O. Kim, H. S. Chung

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A unique approach is presented for preparing highly dispersed ultrafine copper particles from cuprous oxide slurry using a wet chemical reaction with hydrazine (N2H4) as a reductant along with an appropriate addition of sodium pyrophosphate (Na4O7P2) as a surfactant. It was found that very thin oxidized surfaces on the copper particles are formed during the reaction in the solution and subsequently sodium pyrophosphate plays an important role in the zeta potential of the particles, affecting their dispersion and growth significantly. The copper particles at low zeta potential easily aggregate and grow to bigger ones, whereas they at high zeta potential keep away each other and grew individually to ultrafine size. Additionally, a model for the copper particles growth in accordance with dispersion is proposed.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - 2008 Mar 1
Externally publishedYes


  • Dispersion
  • Slurry
  • Sodium pyrophosphate
  • Ultrafine copper powders
  • Zeta potential

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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