Abstract:
In recent years, Hydroxyapatite (HAp) has garnered significant attention from researchers in the biomedical field. To emulate natural bone appetite, various combinations of elements are being utilized for substitution within the Hydroxyapatite lattice. In this study, HAp, and modified Hydroxyapatite (by substituting Sr2+, Mg2+, and Ag+ ions) powders were synthesized via wet precipitation method and then coated onto stainless steel (SS 316L) through spin coating. The XRD and FTIR analyses confirmed the formation of HAp and modified HAp. For the characteristic HAp XRD peaks, e.g., for (211), a peak shift from 31.7 to 30.9 with peak broadening was also observed. The FTIR analysis also shows the HAp characteristic absorption spectra for -OH, CO32-, PO3-4 and HPO42- groups at 3400 cm-1 to 3600 cm-1 with specific peak at 3570 cm-1, 1400 cm-1 to 1650 cm-1, 560 cm-1 to 650 cm-1 and 1040 cm-1 respectively. Moreover, a peak broadening for -OH and CO32- groups were observed after the substitution of Sr2+, Mg2+, and Ag+ ions. The morphology of the prepared powdered samples was studied using Scanning Electron Microscopy (SEM). For the HAp and modified HAp powdered samples, the SEM analysis shows agglomerated particles with approximate round and flaky shapes, respectively. For the measurement of coating thickness of modified HAp, a few cross-sections were prepared, and the SEM analysis confirmed a dense and uniform coating with a thickness of 100 ± 2 µm. The surface roughness of modified HAp was 2.35 ± 0.02 µm which was observed using optical profilometry. Corrosion resistance testing results were obtained using three electrode cell assembly via Gamry (potentiostate) in which Rp value increase from 71.92×103 to 174.7×103, whereas corrosion rate decreases from 6.846 Mpy to 284.9 ×10-3 Mpy, and antibacterial properties of the prepared samples were investigated using disc diffusion method. The results of the modified HAp coating samples show improved antibacterial, corrosion, and surface properties, unequivocally highlighting their potential as ideal candidate for orthopedic implant .
