Temperature Effect on Hydroxyapatite Preparation by Co-precipitation Method under Carbamide Influence

Abstract

Abstract. Hydroxyapatite crystal was prepared by homogeneous co-precipitation method using a mixture of Calcium nitrate and diammonium phosphate as raw materials and carbamide as the buffering agent. To analyzed the influence of temperature on hydroxyapatite crystal morphology, the phase composition, crystal morphology and growth orientation were characterized by X-ray diffraction , scanning electron microscope and infrared spectrum respectively. The results show that when the reaction temperature increase from 70 to 95 the phases composition of crystal transform from the two phases of tricalcium phosphate and eight calcium phosphate to hydroxyapatite single crystal; the morphology of the hydroxyapatite crystals transforms from nodular whisker to perfectly and compactly acicular whisker.

Biocomposite scaffold preparation from hydroxyapatite extracted from waste bovine bone

“…This result shows that reaction rate increased with increasing reaction temperature and at 90°C high impurity HA was created. This agrees with the results of Luo [19]. Moreover, besides increasing intensity, the HA peaks also become sharper which means that crystallinity increased with increasing reaction temperature.…”

Effect of Nitrate Acid Treated Dolomite on the Tensile Properties of Ultra-High Molecular Weight Polyethylene (UHMWPE) Composites

“…Additionally, the presence of hno₃ slows down or even prevents the nucleation of Ca 10 (Po 4 ) 6 (oh) 2 crystals due to the inhibitory properties of the compound [16]. using a chemical method, luo et al [17] synthesized Ca 10 (Po 4 ) 6 (oh) 2 by employing Ca(No 3 ) 2 •4h 2 o as the calcium source and (Nh 4 ) 2 hPo 4 as the phosphate source. the resulting crystals of Ca 10 (Po 4 ) 6 (oh) 2 exhibited a complete formation and displayed a smooth surface.…”