Characterization and annealing performance of calcium phosphate nanoparticles synthesized by co-precipitation method

Ahmed, Mohamed; Mansour, S.F.; El-Dek, S.I.; Abdelwahab, Sherif; Ahmed, M. K.

doi:10.1016/j.ceramint.2014.04.135

Cited by 75 publications

(31 citation statements)

References 61 publications

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“…9(d)). Accordingly, the anisotropy will be reduced3163. Consequently, the lattice strain is expected to decrease with increasing the annealing temperature, which agreed well with lattice strain results as shown in Fig.…”

Section: Discussionsupporting

confidence: 87%

Physico-mechanical and morphological features of zirconia substituted hydroxyapatite nano crystals

Mansour

El-Dek

Ahmed

2017

Sci Rep

141

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Zirconia doped Hydroxyapatite (HAP) nanocrystals [Ca10(PO4)6−x(ZrO2)x(OH)2]; (0 ≤ x ≤ 1 step 0.2) were synthesized using simple low cost facile method. The crystalline phases were examined by X-ray diffraction (XRD). The crystallinity percentage decreased with increasing zirconia content for the as-synthesized samples. The existence of zirconia as secondary phase on the grain boundaries; as observed from scanning electron micrographs (FESEM); resulted in negative values of microstrain. The crystallite size was computed and the results showed that it increased with increasing annealing temperature. Thermo-gravimetric analysis (TGA) assured the thermal stability of the nano crystals over the temperature from room up to 1200 °C depending on the zirconia content. The corrosion rate was found to decrease around 25 times with increasing zirconia content from x = 0.0 to 1.0. Microhardness displayed both compositional and temperature dependence. For the sample (x = 0.6), annealed at 1200 °C, the former increased up to 1.2 times its original value (x = 0.0).

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Section: Discussionsupporting

confidence: 87%

Physico-mechanical and morphological features of zirconia substituted hydroxyapatite nano crystals

Mansour

El-Dek

Ahmed

2017

Sci Rep

141

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“…Total weight loss of the brushite at pH 5, HAP at pH 9 and 12 was 21.15, 6.91 and 6.283 %, respectively, at the end of the experiment at 1200°C. This emphasizes the hypotheses that the higher pH values lead to higher thermal stability which is in good agreement with the reported work (Ahmed et al 2014). The advantage of thermal analysis is to specify the working temperature range at which the bioceramics are applicable.…”

Section: Semsupporting

confidence: 90%

“…Further investigation of the FTIR spectra revealed that the band at 1649 cm -1 was ascribed to the bending mode of H 2 O. The bands at 3166, 3287, 3489 and 3542 cm -1 corresponded to stretching vibration of water [m s (O-H)] (Singh et al 2010;Ahmed et al 2014). The bands between 3000 and 3600 cm -1 show the presence of DCPD but not in its anhydrous form DCPA (Singh et al 2010;Zou et al 2012).…”

Section: Ftir Analysismentioning

confidence: 99%

“…The presence of carbonate results from the ambient CO 2 dissolved during the crystallization process, whereas HAP crystals are very susceptible to CO 2 . It is observable that all samples are classified as B-type (where CO 3 2-substitutes phosphate position) (Ahmed et al 2014). It should be mentioned that carbonate substitution has a critical role in the crystal structure, stability and biological activity (Morales et al 2013;Minh et al 2013).…”

Section: Ftir Analysismentioning

confidence: 99%

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Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases

et al. 2015

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Hydroxyapatite (HAP) and dicalcium phosphate dihydrate (brushite) nanoparticles were prepared by co-precipitation method. The obtained products were characterized by X-ray powder diffraction (XRD), Fourier transformation infra-red spectroscopy (FTIR) and thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) and transmission electron microscope (TEM) were used to investigate the morphology of the powdered samples as well as their microstructure, respectively. Brushite samples were obtained in a spherical shape, while hydroxyapatite was formed in a needle and rice shape depending on the pH value.

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“…However pH can influence crystalinity and purity of HAp obtained and types of calcium salts produced. The crystallite size of HAp nanoparticles was determined using the Scherrer equation The previous research explained that variation of pH at 5,6,9, and 11 proved that at pH 11 was stable condition to synthesis Hap if compared with other pH [10] while other research learned that suitable pH was a crucial factor on synthesis HAp [11], also revealed that nano-crystaline of HAp can be produced if pH of solution was more than 9, and pH also be able to influence the morphology of Hap synthesized [12].…”

Section: Analysis Of Hap Synthesized By X-ray Diffractionmentioning

confidence: 99%

The Effect of pH on Synthesis of Hydroxyapatite from Geloina Coaxans Shell

Yanti

Nia

2017

IJPS

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The effect of pH on synthesis of hydroxyapatite from Geloina coaxans shell has been done by precipitation method. Geloina coaxans shells and several phosphate sources (NH4)2 HPO4 and H3PO4 were used as precursors on synthesis of HAp. Synthesis of HAp was done with molar ratio of precursors 1,67 and pH of solution were varied at 10, 12, 13, and 14. The result proved that nano-HAp can be obtained successfully and shown that pH value was a significant parameter variable on synthesis HAp that can influence crystalinity and purity of HAp. Using Schererr equation, particle size of HAp powder of (NH4)2HPO4 was 26,69 while H3PO4 was 40 nm respectively.Keywords: Geloina coaxans, HAp, (NH4)2HPO4 and H3PO4 ABSTRAK Pengaruh pH pada sintesis hidroksiapatit mengggunakan cangkang lokan (Geloina coaxans) telah dilakukan menggunakan metode pengendapan. Cangkang lokan (Geloina coaxans) dan beberapa sumber posfat seperti (NH4)2 HPO4 dan H3PO4 telah digunakan sebagai prekursor pada sintesis senyawa hidroksiapatit. Sintesis senyawa hidroksiapatit ini dilakukan dengan perbandingan molar prekursor 1,67 dan pH larutan divariasikan pada 10, 12, 13, dan 14. Hasil yang diperoleh menunjukkan bahwa nano-hidroksiapatit dapat diperoleh melalui variasi pH, dan membuktikan bahwa pH merupakan suatu parameter penting dalam sintesis hidroksiapatit yang dapat mempengaruhi kristalinitas dan kemurnian dari hidroksiapatit yang dihasilkan. Dengan menggunakan persamaan Schererr, ukuran partikel hidroksiapatit yang yang dihasilkan (NH4)2HPO4 adalah 26,69 sedangkan H3PO4 adalah 40 nm Kata kunci: Geloina coaxans, HAp, (NH4)2HPO4 and H3PO4

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Characterization and annealing performance of calcium phosphate nanoparticles synthesized by co-precipitation method

Cited by 75 publications

References 61 publications

Physico-mechanical and morphological features of zirconia substituted hydroxyapatite nano crystals

Physico-mechanical and morphological features of zirconia substituted hydroxyapatite nano crystals

Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases

The Effect of pH on Synthesis of Hydroxyapatite from Geloina Coaxans Shell

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