Transparent CoAl2O4 hybrid nano pigment by organic ligand-assisted supercritical water

Dinesh Rangappa, Takashi Naka, Akitsugu Kondo, Masahiko Ishii, Toshikatsu Kobayashi, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)


Transparent types of inorganic pigments are important as they can be used in a variety of applications, such as metallic finishing, contrast enhancing luminescent pigments, high-end optical filters, and so on. Currently, the difficulty in producing monodisperse and stable binary metal oxide nano pigments at low temperature hampers the applicability and realization of transparent blue nano pigments. Here, for the first time, we report organic ligand capped CoAl2O4 hybrid transparent nano pigment, which has a particle size less than 8 nm with well-stabilized single nanocrystals, using organic ligand-assisted supercritical water as the reaction medium. The organic ligand capping could effectively inhibit the particle growth and also control the size of nanocrystals. This helps to diminish the scattering effect of the nano blue pigment, realizing a transparent cobalt blue nano pigment without any postheat treatment.

Original languageEnglish
Pages (from-to)11061-11066
Number of pages6
JournalJournal of the American Chemical Society
Issue number36
Publication statusPublished - 2007 Sept 12

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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