Comparative study of hydroxyapatite/gelatin composites reinforced with bio-inert ceramic particles

Kailasanathan, C.; Selvakumar, N.

doi:10.1016/j.ceramint.2011.12.073

Cited by 41 publications

(16 citation statements)

References 31 publications

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“…The splitted weak bands 400–525 cm −1 could be assigned to the zirconia; the bands at 427.5 cm −1 at x = 0.2 and 525.1 cm −1 at x = 1.0 could be attributed to Zr–O-Zr stretching mode283637. Considerably, the small amount of doped zirconia, makes it difficult to differentiate between the bands attributed to HAP and ZrO 2 as observed from FTIR spectra.…”

Section: Resultsmentioning

confidence: 98%

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

Mansour

El-Dek

Ahmed

2017

Sci Rep

138

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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: Resultsmentioning

confidence: 98%

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

Mansour

El-Dek

Ahmed

2017

Sci Rep

138

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“…FT-IR spectra of initial complete nano-HAP, PLLA and the nano-HAP combined with 1wt % PLLA is shown in Figure 4 ( Kailasanathan and Selvakumar, 2012). The peaks at 1758 cm -1 , 1188 cm -1 , 1455 cm -1 represent the vibration of C=O, C-O, and CH(CH3) respectively in the spectrum of PLLA ( Figure 4a).…”

Section: Ft-ir Analysismentioning

confidence: 97%

Optimization of β-carotene production by a newly isolated Serratia marcescens strain

Shuai

Nie

Gao

et al. 2012

Electron. J. Biotechnol.

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Cracks often occur when nano-hydroxyapatite bone scaffolds are fabricated with selective laser sintering, which affect the performance of scaffolds. In this study, a small amount of poly (l-lactide acid) (PLLA) was added into nano-hydroxyapatite (nano-HAP) powder by mechanical blending in order to improve the sintering properties. The nano-HAP powder combined with 1wt % PLLA was sintered under different laser power (5W, 7.5W, 10W, 12.5W, 15W and 20W). The fabricated scaffolds were characterized using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Micro Hardness Tester. The results showed that nano-HAP particles grew up quickly with the laser power increasing, and there were many strip-like cracks on the surface of sintering zone. The cracks gradually reduced until disappeared when the laser power increased to 15W, together with a great improvement of density. Large pores were observed on the specimen when the laser power further increases, accompanied with the decomposition of HAP into β-tricalcium phosphate (β-TCP) and tetracalcium phosphate (TTCP). And the optimum parameters were eventually obtained with laser power of 15W, scanning speed of 1000 mm/min, powder bed temperature of 150ºC, laser spot diameter of 2 mm and layer thickness of 0.2 mm. We summarized that the molten PLLA enhanced the particle rearrangement of nano-HAP by capillary force and may absorb thermal stress in laser sintering process, while PLLA would be oxidized gradually until completely excluded from the sintered nano-HAP scaffolds, which was confirmed by FTIR analysis. This study provides a novel method to improve the sintering properties of nano-HAP with no adverse effects which would be used in the application of bone tissue engineering potentially.

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“…These were the results of the gradual dehydroxylation of HAP powder. This can be explained by the following reaction [38]: In case of HAP at 468 °C the x is 1.12 and 56.103% of -OH group was eliminated, this being calculated from the weight loss results accompanied with OH group elimination ratio.…”

Section: Determination Of the Thermal Stability Of The Compositesmentioning

confidence: 99%

Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

Barabáş

Katona

Bogya

et al. 2015

Ceramics International

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Comparative study of hydroxyapatite/gelatin composites reinforced with bio-inert ceramic particles

Cited by 41 publications

References 31 publications

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

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

Optimization of β-carotene production by a newly isolated Serratia marcescens strain

Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

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