Ribbon-like and rod-like hydroxyapatite crystals deposited on titanium surface with electrochemical method |
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| Affiliation: | 1. Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;2. Department of Electronics and Electrical Communication Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;1. Department of Metallurgical Engineering, PSG College of Technology, Coimbatore641 004, India;2. Department of Production Engineering, PSG College of Technology, Coimbatore 641 004, India;3. Department of Mechanical Engineering, Saveetha School of Engineering, Chennai 602 105, India;1. Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 446–701 Yongin, Republic of Korea;2. Department of Chemistry, Inha University, Incheon, Republic of Korea |
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| Abstract: | Homogeneous coatings were attained by electrochemical method in electrolytes containing Ca2+ and PO43? ions with Ca/P ratio being 1.67. SEM observation showed that the hydroxyapatite (HAp,Ca10(PO4)6(OH)2) crystals prepared with higher concentration electrolyte (4 × 10? 2 M Ca2+) are ribbon-like with thickness of nanometer size, a morphology seldom reported previously. In an electrolyte of lower concentration (6 × 10? 4 M Ca2+), the HAp crystals formed are rod-like with a hexagonal cross section and diameter of about 70–80 nm. XRD patterns and IR spectra confirmed that the coatings consist of HAp crystals. TEM micrographs and SAD indicated that the longitude direction for both ribbon-like and rod-like crystal is 002], and the flat surface of the ribbon is (110). HRTEM showed that the ribbon-like crystal is a mixture of HAp and octacalcium phosphate (OCP, Ca8H2(PO4)6.5H2O). |
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