TY - JOUR
T1 - Na-doped hydroxyapatite coating on carbon/carbon composites
T2 - Preparation, in vitro bioactivity and biocompatibility
AU - Li, Hejun
AU - Zhao, Xueni
AU - Cao, Sheng
AU - Li, Kezhi
AU - Chen, Mengdi
AU - Xu, Zhanwei
AU - Lu, Jinhua
AU - Zhang, Leilei
PY - 2012/12/15
Y1 - 2012/12/15
N2 - Na-doped hydroxyapatite (Na-HA) coating was directly prepared onto carbon/carbon (C/C) composites using electrochemical deposition (ECD) and the mean thickness of the coating is approximately 10 ± 2 μm. The formed Na-HA crystals which are Ca-deficient, are rod-like with a hexagonal cross section. The Na/P molar ratios of the coating formed on C/C substrate is 0.097. During the deposition, the Na-HA crystals grow in both radial and longitudinal directions, and faster along the longitudinal direction. The pattern formation of crystal growth leads to dense coating which would help to increase the bonding strength of the coating. The average shear bonding strength of Na-HA coating on C/C is 5.55 ± 0.77 MPa. The in vitro bioactivity of the Na-HA coated C/C composites were investigated by soaking the samples in a simulated body fluid (SBF) for 14 days. The results indicate that the Na-HA coated C/C composites can rapidly induce bone-like apatite nucleation and growth on its surface in SBF. The in vitro cellular biocompatibility tests reveal that the Na-HA coating was better to improve the in vitro biocompatibility of C/C composites compared with hydroxyapatite (HA) coating. It was suggested that the Na-HA coating might be an effective method to improve the surface bioactivity and biocompatibility of C/C composites.
AB - Na-doped hydroxyapatite (Na-HA) coating was directly prepared onto carbon/carbon (C/C) composites using electrochemical deposition (ECD) and the mean thickness of the coating is approximately 10 ± 2 μm. The formed Na-HA crystals which are Ca-deficient, are rod-like with a hexagonal cross section. The Na/P molar ratios of the coating formed on C/C substrate is 0.097. During the deposition, the Na-HA crystals grow in both radial and longitudinal directions, and faster along the longitudinal direction. The pattern formation of crystal growth leads to dense coating which would help to increase the bonding strength of the coating. The average shear bonding strength of Na-HA coating on C/C is 5.55 ± 0.77 MPa. The in vitro bioactivity of the Na-HA coated C/C composites were investigated by soaking the samples in a simulated body fluid (SBF) for 14 days. The results indicate that the Na-HA coated C/C composites can rapidly induce bone-like apatite nucleation and growth on its surface in SBF. The in vitro cellular biocompatibility tests reveal that the Na-HA coating was better to improve the in vitro biocompatibility of C/C composites compared with hydroxyapatite (HA) coating. It was suggested that the Na-HA coating might be an effective method to improve the surface bioactivity and biocompatibility of C/C composites.
KW - Carbon/carbon composites
KW - Coating
KW - Electrochemical deposition
KW - Hydroxyapatite
KW - Simulated body fluid
UR - http://www.scopus.com/inward/record.url?scp=84869498112&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2012.09.022
DO - 10.1016/j.apsusc.2012.09.022
M3 - 文章
AN - SCOPUS:84869498112
SN - 0169-4332
VL - 263
SP - 163
EP - 173
JO - Applied Surface Science
JF - Applied Surface Science
ER -