Effect of substrate nature on the electrochemical deposition of calcium-deficient hydroxyapatites

[摘要] Calcium phosphates were obtained by reducing nitrate ions to produce hydroxide ions on TiO2/stainless steel and TiO2/titanium electrodes. TiO2coatings on metallic substrates were prepared by sol-gel dip-coating method. The morphology of deposits was observed by FESEM. Chemical nature of calcium phosphate deposits was identified by Raman micro-spectroscopy and FESEM/EDS microanalysis. Electrochemical behavior of nitrate and nitrite reduction on stainless steel and titanium electrodes was studied by linear sweep voltammetry. In addition, voltammetric study of the calcium phosphate electrodeposition on both electrodes was performed. From these measurements was selected the potential to form a calcium phosphate. A catalytic current associated to nitrate reduction reaction was obtained for stainless steel electrode, leading to significant deposition of calcium phosphate. Ca/P ratio for both substrates was less than 1.67. The formation of calcium deficient hydroxyapatite was confirmed by Raman spectroscopy.

[发布机构] Universidad Industrial de Santander, CMN, Piedecuesta-Santander, Colombia^1;Universidad Santiago de Cali, Cali, Colombia^2

[效力级别] 化学

[关键词] Calcium deficient hydroxyapatite;Electrochemical behaviors;Linear sweep voltammetry;Raman micro spectroscopy;Sol-gel dip-coating method;Stainless steel electrode;Titanium electrodes;Voltammetric studies