Size-controlled synthesis of metal oxide nanoparticles with a flow-through supercritical water method

Kiwamu Sue, Muneyuki Suzuki, Kunio Arai, Tomotsugu Ohashi, Haruo Ura, Keitaro Matsui, Yukiya Hakuta, Hiromichi Hayashi, Masaru Watanabe, Toshihiko Hiaki

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Hydrothermal synthesis of metal oxide (AlOOH/Al2O3, CuO, Fe2O3, NiO, ZrO2) nanoparticles from metal nitrate aqueous solution was carried out at 673 K and pressures ranging from 25 MPa to 37.5 MPa with a flow-through supercritical water method. Size, phase and crystallinity of the obtained particles were characterized by TEM, XRD and TG, respectively. Effect of the difference of the metals in starting materials, pressures and concentrations on particle size and crystallinity was analyzed on the basis of supersaturation, which was evaluated by estimated metal oxide solubility. The result suggests that supersaturation should be set to higher than around 104 in this method to obtain particles under 10 nm in diameter. Further, crystallinity of the obtained particles was evaluated as weight loss through TG analysis. It was found that higher supersaturation decreased the crystallinity. This result can be explained that high supersaturation led to the inclusion of water molecules during the formation of particles.

Original languageEnglish
Pages (from-to)634-638
Number of pages5
JournalGreen Chemistry
Volume8
Issue number7
DOIs
Publication statusPublished - 2006 Jul 3

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

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    Sue, K., Suzuki, M., Arai, K., Ohashi, T., Ura, H., Matsui, K., Hakuta, Y., Hayashi, H., Watanabe, M., & Hiaki, T. (2006). Size-controlled synthesis of metal oxide nanoparticles with a flow-through supercritical water method. Green Chemistry, 8(7), 634-638. https://doi.org/10.1039/b518291c