Nanosized hydroxyapatite powder synthesized from eggshell and phosphoric acid.
The present research describes synthesis of highly sinterable, nano-sized hydroxyapatite (HAp) powders using a wet chemical route with recycled eggshell and phosphoric acid as calcium and phosphorous sources. The raw eggshell was easily turned to CaO by the calcining process, and phosphoric acid was mixed with the calcined eggshell by the wet, ball-milling method. The crystalline development and microstructures of the synthesized powders and sintered samples were examined by X-ray diffractometry and scanning electron microscopy, respectively. The observed phases on the powder synthesis process were dependent on the mixing ratio (wt%) of the calcined eggshell to phosphoric acid and the heating temperature. The ball-milled, nano-sized HAp powder, which has an average particle size of 70 nm, was fully densified at 1300 degrees C for 1h. The Ca/P ratio for stoichiometric composition of HAp was controlled by adjustment of the mixing ratio.
Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 534-729, Korea.
Sang-Jin
SJ
Lee
Young-Soo
YS
Yoon
Myung-Hyun
MH
Lee
Nam-Sik
NS
Oh
D000818:Animals; D017610:Calcium Compounds / Q000737:chemistry*; D002645:Chickens; D003460:Crystallization / Q000379:methods*; D017886:Durapatite / Q000138:chemical synthesis*; D004528:Egg Shell / Q000737:chemistry*; D006358:Hot Temperature; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D010756:Phosphoric Acids / Q000737:chemistry*; D011208:Powders; D013499:Surface Properties
D017610:Calcium Compounds; D046911:Macromolecular Substances; D010087:Oxides; D010756:Phosphoric Acids; D011208:Powders; D017886:Durapatite; C016538:lime; C030242:phosphoric acid