CaP Precipitation on Titanium under UV Lighting and Effect of Urea Concentration

Volume 7, Issue 2, April 2022     |     PP. 32-45      |     PDF (1767 K)    |     Pub. Date: June 24, 2022
DOI: 10.54647/materials43184    97 Downloads     161668 Views  

Author(s)

Qing Zhou, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Liang-Liang Zhang, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Ming-Li Xie, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China

Abstract
This paper reports the precipitation of calcium phosphate (CaP) on alkaline hydrothermally treated titanium alloy under ultraviolet (UV) lighting. Urea (NH2CONH2) with different concentrations were added into a simulated body fluid buffered by sodium lactate. CO2 and NH3 gas release during immersion tests were detected. The pH values were also examined during the tests. The results show that the detected NH3 and CO2 concentrations near the solution are larger than those in the air. The release of NH3 and CO2 due to the hydrolysis of urea was confirmed both under UV lighting and under dark. It is shown by SEM photographs that the precipitated CaP particles are surrounded by organic which is supposed to be lactate deposition after 14 days immersion. A structure of embedded CaP particles in organic deposition matrix is considered as a primary stage of the formation of CaP-CO-NaCl layer. UV lighting causes the contents of Na and Cl increased, but C and O decreased.

Keywords
CaP biomineralization, photocatalysis, NH3 release, CO2 release, urea, titanium alloy

Cite this paper
Qing Zhou, Liang-Liang Zhang, Ming-Li Xie, CaP Precipitation on Titanium under UV Lighting and Effect of Urea Concentration , SCIREA Journal of Materials. Volume 7, Issue 2, April 2022 | PP. 32-45. 10.54647/materials43184

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