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5324862 
Journal Article 
Molecular Mechanism of Nano-Hydroxyapatite Surface Changes from Hydrophilic to Hydrophobic 
Ran, Xu; Yu, X; He, Jin; Xiao, Zhe 
2014 
Yes 
Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 
26 
17 
5355-5359 
WOS:000343769500010 
The hydroxyapatite was modified via a stearic acid with different content. The microstructure, surface structure and surface element binding energy of the modified hydroxyapatite were investigated. Furthermore, the activation ratio of the modified hydroxyapatite was also tested. The FTIR and XPS detection revealed that the stearic acid molecules had been grafted onto the hydroxyapatite's surface through ionic bonds, which had been formed through a reaction between the carboxyl groups of the stearic acid molecules and the calcium ions on the hydroxyapatite's surface. The result of the activation ratio test demonstrated that in the presence of a critical value of stearic acid, the hydroxyapatite's surface was then modified to a nearly complete hydrophobic state. 
Hydroxyapatite; Hydrophilicity change; Molecular mechanism.