Morphologies of Hydroxyapatite Crystal Deposited on Titanium Surface with Electrochemical Technique
Homogeneous coatings adhered strongly to titanium substrates were attained by electrochemical method in electrolytes containing Ca2+ and PO4 3- ions with Ca/P ratio being 1.67. SEM observation showed that the HAp crystals prepared with higher concentration electrolyte (4x10-2M Ca2+) are ribbon-like with thickness of nanometer size, a morphology seldom reported previously. In an electrolyte of lower concentration (6x10-4M Ca2+), the HAp crystals formed are rod-like with defined hexagonal cross section and diameter of about 70-80nm. The electrolyte of intermediary concentration (5x10-3M Ca2+) produced plate-like HAp crystals. XRD patterns and IR spectra confirmed that the coatings consist of HAp crystals.
Xingdong Zhang, Xudong Li, Hongsong Fan, Xuanyong Liu
W. Ye and X. X. Wang, "Morphologies of Hydroxyapatite Crystal Deposited on Titanium Surface with Electrochemical Technique", Key Engineering Materials, Vols. 330-332, pp. 601-604, 2007