X-ray diffraction and fourier transform infrared analysis of nanophase apatite coatings prepared by electrocrystallization |
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| Affiliation: | 1. Lab for Nano-minerals and Mineral Materials, School of Resources & Environmental Engineering, Hefei University of Technology, Hefei, 230009, China;2. Institute of Atmospheric Environment & Pollution Control, School of Resources & Environmental Engineering, Hefei University of Technology, Hefei, 230009, China;1. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia;2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35,400-00, Brazil;3. Federal University of Itajubá, Campus Itabira, Itabira, MG, Brazil;1. Instituto Tecnológico de Cd. Madero, División de Estudios de Posgrado e Investigación, Juventino Rosas y Jesús Urueta S/N, Col. Los Mangos, 89440 Cd. Madero, Tam., Mexico;2. Universidad Autónoma del Estado de Hidalgo, Ciudad Universitaria Carretera Pachuca-Tulancingo, Mexico;3. Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Km. 107 Carretera Tijuana-Ensenada, Baja California, Mexico;1. Instituto Nacional de Investigaciones Nucleares, Departamento de Química, Carretera México-Toluca S/N La Marquesa, Ocoyoacac, C.P. 52750, Mexico;2. Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Carretera Toluca-Atlacomulco Km. 14.5, San Cayetano, Toluca, Estado de México, Mexico;3. Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón esq. Paseo Tollocan, S/N., C.P. 50180, Toluca, Mexico |
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| Abstract: | The concept of biological fixation of artificial joint prosthesis by using bioactive calcium phosphate coatings has generated considerable interest in recent years. This paper reports an electrocrystallization process for fabricating stoichiometric and non-stoichiometric hydroxyapatite (HA) coatings with nanometer size crystals similar to biogenic apatite. X-ray diffraction and Fourier Transform Infrared (FTIR) spectroscopy were used to characterize the structure and chemical composition of the HA coatings.As-deposited coatings at 65°C were poorly crystalline, Ca-deficient HA with a crystallite size of about 35 nm and exhibited apatitic characteristics similar to bone apatite. Post-treatment of coatings in steam at 125°C followed by calcining at 425°C resulted in the transformation of the initial phase to a well-defined stoichiometric HA with a crystallite size of about 100 nm. |
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