Title: Inserting of strontium during coating of hydroxyapatite compound on titanium substrate

Authors: E.A. Abdel-Aal

Addresses: Central Metallurgical Research and Development Institute (CMRDI), P.O. Box 87, Helwan, Cairo, Egypt

Abstract: For the first time, strontium hydrogen phosphate, SrHPO₄ (SrHP) with or without brushite (dicalcium phosphate dihydrate CaHPO₄.2H₂O) is electrocrystallised on titanium substrate by electrochemical deposition technique. SrHP is converted to strontiumapatite, Sr₁₀ (PO₄)₂(OH) ₂. Different Ca substitution percentages by Sr were applied ranged from 0% to 100%. The electrolyte was 0.167 M CaCl₂, 0.167 M SrCl₂ and 0.1 M NH₄H₂PO₄. The results showed that at all Sr substitution percentages (0%-100%) and at coating time of one hour, the coating layer is brushite or strontium hydrogen phosphate at 100% Ca substitution by Sr. Furthermore, with increasing Ca substitution by Sr percentages from 0% to 100%, the coating thickness is significantly decreased. Moreover, with increasing Ca substitution by Sr percentages (0%-100%), the morphology and composition are changed. Thickness and weight gain are decreased with sodium hydroxide treatment.

Keywords: biomaterials; thin films; electrochemical deposition; hydroxyapatite coatings; strontiumapatite; strontium hydrogen phosphate; titanium substrate; coating thickness; sodium hydroxide; titanium alloys; biomedical implants; bioengineering; biomedical engineering.

DOI: 10.1504/IJNP.2011.038254

International Journal of Nanoparticles, 2011 Vol.4 No.1, pp.77 - 92

Received: 13 May 2010
Accepted: 23 Jul 2010
Published online: 13 Mar 2015 *

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