The composition and structure of bone apatite and synthetic hydroxyapatite powder prepared by precipitation method, sol-gel method was studied by FTIR, EMPA, AFM in this paper. The results showed that the compositio...The composition and structure of bone apatite and synthetic hydroxyapatite powder prepared by precipitation method, sol-gel method was studied by FTIR, EMPA, AFM in this paper. The results showed that the composition and phase structure of apatite powder prepared by sol-gel method was most similar with that in the bone. The caleium phosphate ratios of apatite prepared two kinds of wet precipitation was 1.69, and 1.73 respectively. The culcium phosphate ratio of apatite prepared by sol-gel method was 1.66. The apatite powder prepared by sol-gel nwthod was hoped to be more bionctive and biocompatible compared with apatite powder prepared by wet precipitation method. The EMPA results prored thor the bone consisted of Ca, P,O, Na, Mg , K, Cl, etc elemeuts. The amount of aptaite decreased while amount of collagen increased from the outer layer to inner layer of the bone. AFM results showed that HA particle, with the size about 150-450 nm in length, 100- 150 nm in width, 15-40 nm in thickness, grown layer upon layer regularly. The long axis was not always parallel to the eollagen fiber. The angle between eollagen fiber and aputite lamellar was about 30-45 degree.展开更多
This study aimed at exploring the effect of surface morphology of dense phosphate calcimn （Ca-P） ceramics upon the formation of bone-like apatite in static or dynamic simulated body fluid （SBF）. Dense and sandblas...This study aimed at exploring the effect of surface morphology of dense phosphate calcimn （Ca-P） ceramics upon the formation of bone-like apatite in static or dynamic simulated body fluid （SBF）. Dense and sandblasted calcium phosphate ceramics were immersed into dynamic SBF flowing at normal physiological speed of body fluid of skeletal muscle. The changes were characterized using SEM, XPS, IR and XRD. Changes can be observed after the sandblasted surface of dense calcium phosphate ceramics had been immersed in SBF for 14 days. XPS analysis results showed that the flake-like structure was composed of Ca, P, C, O; IR analysis result of surface structure of samples showed that there were specific peaks for CO3^2-; XRD results indicated the decrease in crystallinity and the increase in amorphous structure. The rough surface was advantageous for the formation of bone-like apatite. Increasing the Ca^2＋, HPO4^2- concentration of SBF could also enhance the bonelike apatite formation. All the results demonstrated that local concentration is a key factor affecting nucleation.展开更多
文摘The composition and structure of bone apatite and synthetic hydroxyapatite powder prepared by precipitation method, sol-gel method was studied by FTIR, EMPA, AFM in this paper. The results showed that the composition and phase structure of apatite powder prepared by sol-gel method was most similar with that in the bone. The caleium phosphate ratios of apatite prepared two kinds of wet precipitation was 1.69, and 1.73 respectively. The culcium phosphate ratio of apatite prepared by sol-gel method was 1.66. The apatite powder prepared by sol-gel nwthod was hoped to be more bionctive and biocompatible compared with apatite powder prepared by wet precipitation method. The EMPA results prored thor the bone consisted of Ca, P,O, Na, Mg , K, Cl, etc elemeuts. The amount of aptaite decreased while amount of collagen increased from the outer layer to inner layer of the bone. AFM results showed that HA particle, with the size about 150-450 nm in length, 100- 150 nm in width, 15-40 nm in thickness, grown layer upon layer regularly. The long axis was not always parallel to the eollagen fiber. The angle between eollagen fiber and aputite lamellar was about 30-45 degree.
文摘This study aimed at exploring the effect of surface morphology of dense phosphate calcimn （Ca-P） ceramics upon the formation of bone-like apatite in static or dynamic simulated body fluid （SBF）. Dense and sandblasted calcium phosphate ceramics were immersed into dynamic SBF flowing at normal physiological speed of body fluid of skeletal muscle. The changes were characterized using SEM, XPS, IR and XRD. Changes can be observed after the sandblasted surface of dense calcium phosphate ceramics had been immersed in SBF for 14 days. XPS analysis results showed that the flake-like structure was composed of Ca, P, C, O; IR analysis result of surface structure of samples showed that there were specific peaks for CO3^2-; XRD results indicated the decrease in crystallinity and the increase in amorphous structure. The rough surface was advantageous for the formation of bone-like apatite. Increasing the Ca^2＋, HPO4^2- concentration of SBF could also enhance the bonelike apatite formation. All the results demonstrated that local concentration is a key factor affecting nucleation.
