Preparation of Ba-hexaferrite nanocrystals by an organic ligand-assisted supercritical water Process

Dinesh Rangappa, Takashi Naka, Satoshi Ohara, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


We are reporting a novel synthetic approach to prepare organic modified Ba-hexaferrite nanocrystals with controlled size and morphology under a supercritical water (SCW) flow reactor process. The surface of the Ba-hexaferrite nanocrystal was capped with oleic acid ligand to control the particle growth, size, and morphology. The results showed that the concentration of oleic acid reagent played a key role in controlling the cubic and octahedral shape of Ba-hexaferrite nanocrystals. This indicates that the size and morphology of nanocrystals were greatly influenced by the organic modification under the SCW process, resulting in a drastic reduction in the particle size from 30 to 9 nm. The organic ligand capped Ba-hexaferrite nanocrystals exhibit a higher coercivity (about 2800 Oe) at 5 and 280 K temperature. This study provides a novel approach for large-scale production of complex metal oxide colloidal nanocrystals with uniform size, well-defined shape, and controlled surface chemistry.

Original languageEnglish
Pages (from-to)11-15
Number of pages5
JournalCrystal Growth and Design
Issue number1
Publication statusPublished - 2010 Jan 6

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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