Document Detail

Nanosized hydroxyapatite powder synthesized from eggshell and phosphoric acid.
MedLine Citation:
PMID:  18047119     Owner:  NLM     Status:  MEDLINE    
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.
Sang-Jin Lee; Young-Soo Yoon; Myung-Hyun Lee; Nam-Sik Oh
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of nanoscience and nanotechnology     Volume:  7     ISSN:  1533-4880     ISO Abbreviation:  J Nanosci Nanotechnol     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-11-30     Completed Date:  2008-01-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101088195     Medline TA:  J Nanosci Nanotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4061-4     Citation Subset:  IM    
Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 534-729, Korea.
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MeSH Terms
Calcium Compounds / chemistry*
Crystallization / methods*
Durapatite / chemical synthesis*
Egg Shell / chemistry*
Hot Temperature
Macromolecular Substances / chemistry
Materials Testing
Molecular Conformation
Nanostructures / chemistry*,  ultrastructure*
Nanotechnology / methods*
Oxides / chemistry*
Particle Size
Phosphoric Acids / chemistry*
Surface Properties
Reg. No./Substance:
0/Calcium Compounds; 0/Macromolecular Substances; 0/Oxides; 0/Phosphoric Acids; 0/Powders; 1305-78-8/lime; 1306-06-5/Durapatite; 7664-38-2/phosphoric acid

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