Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7869791 | Materials Science and Engineering: C | 2015 | 7 Pages |
Abstract
Hydroxyapatite (HAp) samples were synthesized under various amounts of citric acid using the sol-gel method. Before and after immersion in simulated body fluid (SBF) for 14 and 28Â days, the structural properties of HAp samples were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy with energy dispersive X-ray (EDX) spectroscopy and dielectric measurements. The crystallite size (D) was found to be in the range of 25.17-33.06Â nm with the crystallinity percent (XC%) of 69.53-86.09. The lattice parameters of a and c were calculated to be in the ranges of 9.373-9.434Â Ã
and 6.828-6.896Â Ã
, respectively. The morphology of the as-synthesized samples was changed with the amount of citric acid and soaking period in SBF. The Ca/P molar ratios indicated a decrease with increasing immersion time, and Ca-deficiency was observed. The relative permittivity (εâ²) and dielectric loss (εâ³) were significantly affected by citric acid content and soaking period in SBF. It was seen that the alternating current conductivity (Ïac) increased with increasing frequency and the Ïac values changed with increasing soaking period and amount of citric acid.
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Authors
Omer Kaygili, Serhat Keser, Tankut Ates, Cengiz Tatar, Fahrettin Yakuphanoglu,