Rapid and continuous synthesis of cobalt aluminate nanoparticles under subcritical hydrothermal conditions with in-situ surface modification

Jinfeng Lu, Kimitaka Minami, Seiichi Takami, Tadafumi Adschiri

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The synthesis and in-situ organic surface modification of spinel cobalt aluminate nanoparticles were carried out under subcritical reducing hydrothermal conditions (250°C, 30MPa). Single nanoparticles of cobalt aluminate were obtained using a continuous flow-type reactor; in contrast, Co1-xAlx layered double hydroxide (Co-Al-LDHs) became the main product when a batch-type reactor was used. The addition of a surface modifier, hexanoic acid, to the flow-type reaction system changed the hydrophilic surface of the nanoparticles to a hydrophobic surface. Cobalt aluminate nanoparticles modified with hexanoic acid were well dispersed in hexane. The in-situ surface modification during the synthesis of the nanoparticles reduced the particle size from 15nm to 10nm.

Original languageEnglish
Pages (from-to)50-54
Number of pages5
JournalChemical Engineering Science
Volume85
DOIs
Publication statusPublished - 2013 Jan 14

Keywords

  • Cobalt aluminate
  • Dispersion
  • Materials processing
  • Mixing
  • Particle
  • Surface modification

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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