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

研究成果: Article査読

105 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)634-638
ページ数5
ジャーナルGreen Chemistry
8
7
DOI
出版ステータスPublished - 2006 7月 3

ASJC Scopus subject areas

  • 環境化学
  • 汚染

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