Influence of the calcination temperature on morphological and mechanical properties of highly porous hydroxyapatite scaffolds

Scalera, Francesca; Gervaso, Francesca; Sanosh, K.P.; Sannino, Alessandro; Licciulli, Antonio

doi:10.1016/j.ceramint.2012.11.076

Cited by 82 publications

(49 citation statements)

References 36 publications

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“…Under such conditions, the hydroxyapatite support undergoes sintering phenomena. A similar effect was observed in works [61,62] and is related with changes in the shape of DHAp particles. Fig.…”

Section: Catalysts Characterizationsupporting

confidence: 61%

Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

Cichy

Dobosz

Borowiecki

et al. 2017

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This paper presents reports on the glycerol steam reforming reaction. The studies were performed over four nickel catalysts with different metal loading (up to 10 wt%) supported on calcium deficient hydroxyapatite (DHAp). The support was synthetized by the microwave assisted hydrothermal method. The steam reforming reaction was performed under atmospheric pressure in the 650-800°C temperature range using 10 mg of catalyst sample and a glycerol/water mixture with S/C = 3. All catalysts were well characterized by physicochemical methods (XRD, XRF, TPR, HRTEM). The catalytic tests results were presented by means of glycerol conversion, hydrogen and carbon containing gases selectivity. The most promising results were obtained for catalyst with moderate Ni content (*7.5 wt%), which proved to be stable during a few hours on-stream and provided glycerol conversion at least 94% at reaction temperature above 750°C.

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Section: Catalysts Characterizationsupporting

confidence: 61%

Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

Cichy

Dobosz

Borowiecki

et al. 2017

Reac Kinet Mech Cat

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“…Biodegradation of a scaffold occurs from the time of implantation in vivo to the completion of bone regeneration [24,25]. Controlling the biodegradation rate of any scaffold to match the bone tissues regeneration rate requires a balance between degradability and on the other hand a sufficient mechanical integrity.…”

Section: Discussionmentioning

confidence: 99%

Phase Composition and Crystallinity of Hydroxyapatite With Various Heat Treatment Temperatures

et al. 2018

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Objective: This study investigated effects of heat treatment on the crystallinity and phase composition of hydroxyapatites (HAs) of different heat treatment.Methods: HA powder was synthesized by the chemical precipitation method based on the reaction between the phosphorous acid and calcium hydroxide. Synthesized HA was divided into three groups for which each group was then given heat treatment at 100°C, 900°C, or 1300ºC. Phase identification, analyses and the crystallinity of the synthesized HAs were determined using the X-ray diffraction coupled with the Rietveld refinement. Results:The synthesized HAs with each heat treatment were identified as HA phase containing hexagonal structure. Those treated at 100°C or 900°C revealed with crystallinity of 48% and 68%, respectively, with no additional phase; whereas, those treated at 1300°C produced a crystallinity of 72% and contained dicalcium and tricalcium phosphates. Conclusion:The synthesized HAs treated at 100°C, 900°C, or 1300°C were HA phase with hexagonal structure. The variable crystallinity of the synthesized HAs yielded from different heat treatment temperature correspondingly determines different phase composition.

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“…FTIR spectrum and EDX of the synthesized NHA powder are shown in figures 8 and 9, respectively. From the FTIR spectra in figure 8, two peaks for stretching and bending modes of P-O are identified at 1029.93 and 603.52 cm −1 , respectively, indicating the presence of PO 4− 3 ions [6,9]. Furthermore, at wavelength of 825 cm −1 presence of acidic phosphate group [11].…”

Section: Properties Of the Synthesized Nha Powdermentioning

confidence: 95%

“…BET analysis provides a precise specific surface area from which the particle size of synthesized NHA was calculated. Based on the theoretical density (3.156 g cm −3 ) of NHA [9], the particle size was calculated using…”

Section: Characterization Testsmentioning

confidence: 99%

Nanohydroxyapatite synthesis using optimized process parameters for load-bearing implant

et al. 2016

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In this study, nanohydroxyapatite (NHA) was synthesized using calcium nitrate tetrahydrate and diammonium hydrogen phosphate via the precipitation method assisted with ultrasonication. Three independent process parameters: temperature (T) (70, 80 and 90 • C), ultrasonication time (t) (20, 25 and 30 min), and amplitude (A) (60, 65 and 70%) were studied and optimized using response surface methodology based on 3 factors and 5 level central composite design. The responses of the model were analysed with the help of the particle size measured from field-emission scanning electron microscopy and Brunauer-Emmett-Teller (BET). The surface area of particle was measured with BET and the thermal stability of the powder was measured using thermogravimetric analysis. Finally, with the optimized process parameters obtained from the model, the NHA powder was synthesised and validated against the predicted value. The results show a good agreement with an average error 8% between the actual and predicted values. Moreover, the thermal stability and porosity of synthesized NHA was further improved after calcination. This improvement could be due to the removal of impurities from the NHA powder after calcination as indicated by the Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy.

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Influence of the calcination temperature on morphological and mechanical properties of highly porous hydroxyapatite scaffolds

Cited by 82 publications

References 36 publications

Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

Phase Composition and Crystallinity of Hydroxyapatite With Various Heat Treatment Temperatures

Nanohydroxyapatite synthesis using optimized process parameters for load-bearing implant

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