TY - JOUR
T1 - Integrity and zeta potential of fluoridated hydroxyapatite nanothick coatings for biomedical applications
AU - Ge, Xiang
AU - Leng, Yang
AU - Ren, Fuzeng
AU - Lu, Xiong
PY - 2011/10
Y1 - 2011/10
N2 - Fluoridated hydroxyapatite (FHA) coatings exhibit great potential for applications on implants which require good bioactivity and high antibacterial activity. This work is a comparative study of chemical stability, adhesive strength and zeta potential of a nanothick (about 200 nm) FHA coating which is densely and uniformly deposited on a titanium substrate electrochemically. The chemical stability of the nanothick coatings was evaluated using a dissolution test in a simulated physiological solution. The dissolution tests indicate that the fluorine-containing calcium phosphate (CaP) coating with an appropriate heat treatment is chemically stable in a physiological environment, even more so than its HA counterpart. The adhesive strength of FHA coatings was evaluated by the critical load obtained from nanoscratching tests. The critical load which caused coating failure in scratching was determined by a method which correlated the scratching morphology with a sudden change in friction coefficient. The adhesive strength of a nanothick FHA coating was 147% larger than that of HA coating with the same thickness level. The fluorine addition does not have a significant effect on the characteristics of the negative zeta potential of apatite coatings. The solid integrity of this nanothick FHA coating makes it an excellent candidate for biomedical applications.
AB - Fluoridated hydroxyapatite (FHA) coatings exhibit great potential for applications on implants which require good bioactivity and high antibacterial activity. This work is a comparative study of chemical stability, adhesive strength and zeta potential of a nanothick (about 200 nm) FHA coating which is densely and uniformly deposited on a titanium substrate electrochemically. The chemical stability of the nanothick coatings was evaluated using a dissolution test in a simulated physiological solution. The dissolution tests indicate that the fluorine-containing calcium phosphate (CaP) coating with an appropriate heat treatment is chemically stable in a physiological environment, even more so than its HA counterpart. The adhesive strength of FHA coatings was evaluated by the critical load obtained from nanoscratching tests. The critical load which caused coating failure in scratching was determined by a method which correlated the scratching morphology with a sudden change in friction coefficient. The adhesive strength of a nanothick FHA coating was 147% larger than that of HA coating with the same thickness level. The fluorine addition does not have a significant effect on the characteristics of the negative zeta potential of apatite coatings. The solid integrity of this nanothick FHA coating makes it an excellent candidate for biomedical applications.
KW - Dissolution behavior
KW - Electrochemical deposition
KW - Fluoridated hydroxyapatite
KW - Nanoscratching test
KW - Nanothick coating
KW - Zeta potential
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000294187500014
UR - https://openalex.org/W2004523423
UR - https://www.scopus.com/pages/publications/79960563876
U2 - 10.1016/j.jmbbm.2011.03.013
DO - 10.1016/j.jmbbm.2011.03.013
M3 - Journal Article
SN - 1751-6161
VL - 4
SP - 1046
EP - 1056
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
IS - 7
ER -