Structural and mechanical investigations of magnesium and fluoride doped nano calcium phosphates

Download

index.pdf

Date

2009

Author

Sun, Zehra Pınar

Metadata

Show full item record

Item Usage Stats

193
views

86
downloads

The aim of this study was to investigate the microstructure and mechanical properties of pure and Mg2+ and F- doped nano-calcium phosphate (CaP) powders, which were synthesized by precipitation method. After the drying and calcination processes, the samples were sintered at 1100ºC for 1 hour. High densities were achieved except for the 7.5 % mole Mg doped samples. Microstructure of the CaPs were investigated by X- ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Due to the Mg substitution, β-TCP phase was detected besides HAp, resulting in the formation of HAp/ β-TCP biphasic composites with different compositions. The substitutions of the ions have been verified by the decrease in the hexagonal unit cell volumes of the doped CaPs. FTIR spectra revealed the characteristic absorption bands of HAp, β-TCP and the ones that were resulted from the F-OH bonds and substitution of the Mg2+ ions. The SEM results revealed the grain sizes in the range of ~197 nm-740 nm. In general, the micro hardness and diametral tensile strength tests revealed that Mg2+ ions in large amounts (7.5 % mole) had negative effects on the mechanical properties of the samples, while substitution of the F- ions had a positive effect on their mechanical properties.

Subject Keywords

Nanotechnology., Bioceramics., Magnesium.

URI

http://etd.lib.metu.edu.tr/upload/2/12610764/index.pdf
https://hdl.handle.net/11511/18564

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Structural and mechanical investigations of magnesium and fluoride doped nanosize calcium phosphates Evis, Zafer (2010-12-01) Pure and Mg2+ and F doped nano-calcium phosphates (CaP), which were synthesized by a precipitation method to investigate their microstructural and mechanical properties. After the drying and calcination processes, the samples were sintered at 1100 degrees C for 1 hour. High densities were achieved except for the 7.5% mole Mg doped samples. Due to the Mg2+ substitution, beta-TCP phase was detected besides HAp, resulting in the formation of HAp/ beta-TCP biphasic composites with different compositions. The su...
Structural and electronic properties of PFOS and LiPFOS Erkoç, Şakir; Erkoc, F (2001-08-13) The structural and electronic properties of perfluorinated surfactants perfluorooctane sulfonate (PFOS) and lithium perfluorooctane sulfonate (LiPFOS) have been investigated theoretically by performing semi-empirical molecular orbital theory at the level of AM I calculations. The optimized structure and the electronic properties of the molecules are obtained. (C) 2001 Elsevier Science BN. All rights reserved.
Structural and mechanical characteristics of hydroxyapatite and tri-calcium phosphates doped with Al3+ and F- ions Tahmasebifar, A.; Evis, Zafer (2013-08-01) In this study, doping of aluminum (Al3+) and/or fluoride (F-) ions into tri-calcium phosphate (TCP)-hydroxyapatite (HA) composites at various compositions were performed to investigate their microstructure and mechanical properties. Composites were synthesized by a precipitation method and sintered at 1100 degrees C for 1 hr and 5 hrs. Densities of the sintered materials were increased by extending the sintering time and increasing the amount of Al3+ and F- doping. beta-TCP was observed as the main phase in...
Structural and electronic properties of rubreneperoxides Erkoç, Şakir (2002-02-14) The structural and electronic properties of rubrene and three rubreneperoxide isomers have been investigated by performing molecular mechanics and semi-empirical AMI molecular-orbital self-consistent field calculations. It has been found that isolated rubrene and rubreneperoxide isomers have non-planar structure, and are stable but endothermic.
Structural and electronic properties of borazine cyclacenes Erkoç, Şakir (2001-05-04) The structural and electronic properties of borazine cyclacenes (BNn) have been investigated by performing semiempirical molecular orbital self-consistent field calculations at the level of AM1 method within the RHF formulation. It has been found that as the number of borazine rings increases in the arenoid belt the structures become more exothermic.

Citation Formats

Z. P. Sun, “Structural and mechanical investigations of magnesium and fluoride doped nano calcium phosphates,” M.S. - Master of Science, Middle East Technical University, 2009.