Premium
Nucleation and growth of apatite on an anatase layer irradiated with UV light under different environmental conditions
Author(s) -
Uetsuki Keita,
Nakai Shinsuke,
Shirosaki Yuki,
Hayakawa Satoshi,
Osaka Akiyoshi
Publication year - 2013
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.34370
Subject(s) - apatite , anatase , nucleation , materials science , x ray photoelectron spectroscopy , titanium , simulated body fluid , chemical engineering , layer (electronics) , calcination , irradiation , mineralogy , nuclear chemistry , nanotechnology , photocatalysis , metallurgy , chemistry , organic chemistry , catalysis , physics , nuclear physics , engineering
Abstract Implant surfaces must sometimes be modified to form strong bonds to host tissues. The method of depositing an anatase layer on chemically pure titanium by chemical oxidation with H 2 O 2 and subsequent calcination (CHT) is known to deposit apatite under physiological conditions; it thus exhibits bone‐bonding ability. UV irradiation should affect the bonding ability because the CHT anatase layer would experience certain chemical modifications, such as a decrease or an increase in the number of TiOH and TiO(H)Ti sites; these sites are considered active sites for apatite nucleation. When in vitro apatite deposition was examined, using Kokubo's simulated body fluid, UV irradiation in air reduced the apatite‐forming ability of the CHT anatase layer, and UV irradiation on the samples in water enhanced the ability. These results were correlated to changes in the TiOH and TiO(H)Ti sites, as determined by O 1s X‐ray photoelectron spectroscopy. Analysis of the number and size of the semi‐spherical apatite particles and their surface coverage led to a model: proper assembly of the TiOH and TiO(H)Ti sites should only give rise to the induction of apatite nucleation, analogous to topotaxy effects. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 101A: 712–719, 2013.