Preparation of needle‐like hydroxyapatite by homogeneous precipitation under hydrothermal conditions

Yoshinobu Fujishiro, Hiroshi Yabuki, Kunio Kawamura, Tsugio Sato, Akitsugu Okuwaki

    Research output: Contribution to journalArticlepeer-review

    83 Citations (Scopus)


    Preparation of hydroxyapatite was carried out by a homogeneous precipitation technique using hydrothermal reactions of Ca(EDTA)2‐ and PO4 3‐ at 130–250°C and pH 4–10. Hydroxyapatite and monetite were formed above pH 6 and below pH 4, respectively. Needle‐like hydroxyapatite was formed at high temperatures above 130°C. The length of the needle‐like hydroxyapatite crystal increased with increasing working solution pH and temperature.

    Original languageEnglish
    Pages (from-to)349-353
    Number of pages5
    JournalJournal of Chemical Technology & Biotechnology
    Issue number4
    Publication statusPublished - 1993 Jan 1


    • calcium‐EDTA chelate
    • homogeneous precipitation
    • hydrothermal reaction
    • hydroxyapatite
    • needle‐like crystal

    ASJC Scopus subject areas

    • Biotechnology
    • Chemical Engineering(all)
    • Renewable Energy, Sustainability and the Environment
    • Fuel Technology
    • Waste Management and Disposal
    • Pollution
    • Organic Chemistry
    • Inorganic Chemistry


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