title: Preparation of needle-like hydroxyapatite by homogeneous precipitation under hydrothermal conditions.
abstract: Preparation of hydroxyapatite was carried out by a homogeneous precipitation technique using hydrothermal reactions of Ca(EDTA)2- and PO4(3-) at 130-250 degrees 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 degrees C. The length of the needle-like hydroxyapatite crystal increased with increasing working solution pH and temperature.
authors.affiliation: Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University, Sendai, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Fujishiro
authors.forename: H
authors.initials: H
authors.lastname: Yabuki
authors.forename: K
authors.initials: K
authors.lastname: Kawamura
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: A
authors.initials: A
authors.lastname: Okuwaki
mesh_terms: D002118:Calcium / Q000737:chemistry; D011232:Chemical Precipitation; D003460:Crystallization; D004492:Edetic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006882:Hydroxyapatites / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D012996:Solutions; D013696:Temperature
chemical_list: D006882:Hydroxyapatites; D010710:Phosphates; D012996:Solutions; D004492:Edetic Acid; D002118:Calcium