TY - GEN
T1 - Preparation of Ag-doped calcium phosphates
AU - Gokcekaya, Ozkan
AU - Ueda, Kyosuke
AU - Narushima, Takayuki
AU - Ergun, Celaletdin
PY - 2013
Y1 - 2013
N2 - Ag-doped calcium phosphate (CaP) powders were prepared by a precipitation method to obtain antibacterial properties from aqueous solutions of calcium nitrate, silver nitrate, and ammonium phosphate. The atomic ratios of (Ca+Ag)/P and Ag/(Ca+Ag) were varied from 1.33 to 1.67 and from 0 to 0.10, respectively. The chemical compositions, phases, and morphologies of as-precipitated powders and sintered compacts were examined by ICP-AES, XRD, and TEM. The amount of Ag in the as-precipitated CaP powders was lower than the corresponding nominal value whereas the (Ca+Ag)/P ratios were enhanced. Only the hydroxyapatite (HA) phase was observed from as-precipitated powders under all investigated conditions. The shapes of HA particles changed from plate-like/needle-like to ellipsoidal with increasing Ag addition, and Ag nanoparticles were observed on HA particles. After sintering, tricalcium phosphate and HA phases were detected on the basis of an atomic ratio of (Ca+Ag)/P= 1.33, and further, the existence of HA, CaO, tetracalcium phosphate, and metallic Ag phases was inferred from the ratio (Ca+Ag)/P=1.67. Since the X-ray diffraction peaks of HA and tricalcium phosphate shifted upon Ag addition, this shift was taken as evidence of Ag doping in CaPs.
AB - Ag-doped calcium phosphate (CaP) powders were prepared by a precipitation method to obtain antibacterial properties from aqueous solutions of calcium nitrate, silver nitrate, and ammonium phosphate. The atomic ratios of (Ca+Ag)/P and Ag/(Ca+Ag) were varied from 1.33 to 1.67 and from 0 to 0.10, respectively. The chemical compositions, phases, and morphologies of as-precipitated powders and sintered compacts were examined by ICP-AES, XRD, and TEM. The amount of Ag in the as-precipitated CaP powders was lower than the corresponding nominal value whereas the (Ca+Ag)/P ratios were enhanced. Only the hydroxyapatite (HA) phase was observed from as-precipitated powders under all investigated conditions. The shapes of HA particles changed from plate-like/needle-like to ellipsoidal with increasing Ag addition, and Ag nanoparticles were observed on HA particles. After sintering, tricalcium phosphate and HA phases were detected on the basis of an atomic ratio of (Ca+Ag)/P= 1.33, and further, the existence of HA, CaO, tetracalcium phosphate, and metallic Ag phases was inferred from the ratio (Ca+Ag)/P=1.67. Since the X-ray diffraction peaks of HA and tricalcium phosphate shifted upon Ag addition, this shift was taken as evidence of Ag doping in CaPs.
KW - Calcium phosphate
KW - Precipitation method
KW - Silver doping
UR - http://www.scopus.com/inward/record.url?scp=84904133426&partnerID=8YFLogxK
U2 - 10.1002/9781118792148.ch211
DO - 10.1002/9781118792148.ch211
M3 - Conference contribution
AN - SCOPUS:84904133426
SN - 9781632660008
T3 - 8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
SP - 1679
EP - 1685
BT - 8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
PB - John Wiley and Sons Inc.
T2 - 8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
Y2 - 4 August 2013 through 9 August 2013
ER -