Preparation of needle-like hydroxyapatite by homogeneous precipitation under hydrothermal conditions.
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.
Fujishiro
Y
Y
Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University, Sendai, Japan.
Yabuki
H
H
Kawamura
K
K
Sato
T
T
Okuwaki
A
A
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
D006882:Hydroxyapatites; D010710:Phosphates; D012996:Solutions; D004492:Edetic Acid; D002118:Calcium