Calcium hydroxyapatite, Ca10(PO4)6(OH)2 ceramics prepared by aqueous sol–gel processing

Bogdanovičienė, Irma; Beganskienė, Aldona; Tõnsuaadu, Kaia; Gläser, Jochen; Meyer, H.‐Jürgen; Kareiva, Aivaras

doi:10.1016/j.materresbull.2006.02.016

Cited by 112 publications

(71 citation statements)

References 62 publications

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“…SEM images (figure 4) confirm the results of surface area analysis by the BET method as they indicate that the particles are of submicron size and highly porous. Bogdanoviciene et al [15] prepared hydroxyapatite by the sol-gel method using tartaric acid as a complexing agent and reported a microrod-shaped morphology, whereas the SEM images (figure 4) of our samples indicate agglomerated spherical particles. This shows that a different processing method leads to a change in morphology, as expected.…”

Section: Resultscontrasting

confidence: 51%

Effect of metal-ion-to-fuel ratio on the phase formation of bioceramic phosphates synthesized by self-propagating combustion

Swamiappan

Vijayaraghavan

2008

Science and Technology of Advanced Materials

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Synthetic calcium hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) is a well-known bioceramic material used in orthopedic and dental applications because of its excellent biocompatibility and bone-bonding ability due to its structural and compositional similarity to human bone. Here we report, for the first time, the synthesis of HAP by combustion employing tartaric acid as a fuel. Calcium nitrate is used as the source of calcium and diammonium hydrogen phosphate serves as the source of phosphate ions. Reaction processing parameters such as the pH, fuel-oxidant ratio and autoignition temperature are controlled and monitored. The products were characterized by powder x-ray diffraction, which revealed the formation of a hexagonal hydroxyapatite phase. Fourier transform infrared spectroscopy (FT-IR) spectra showed that the substitution of a carbonate ion occurs at the phosphate site. The morphology of the particles was imaged by scanning electron microscopy, which also revealed that the particles are of submicron size. Thermal analysis showed that the phase formation takes place at the time of combustion. Surface area and porosity analysis showed that the surface area is high and that the pores are of nanometer size. The mean grain size of the HAP powder, determined by the Debye-Scherrer formula, is in the range 20-30 nm. Chemical analyses to determine the Ca : P atomic ratio in synthesized ceramics were performed, and it was found to be 1 : 1.66.

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Section: Resultscontrasting

confidence: 51%

Effect of metal-ion-to-fuel ratio on the phase formation of bioceramic phosphates synthesized by self-propagating combustion

Swamiappan

Vijayaraghavan

2008

Science and Technology of Advanced Materials

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“…However, the presence of Gr increased the crystalline domain size of the hydroxyapatite grains, since the reported value for pure hydroxyapatite electrochemically synthesized at the same pH and current density was 21.6 nm [29], indicating that there were interactions between the hydroxyapatite and graphene sheets. http://carbonlett.org broad peak at around 300°C in the DTG curve, corresponds to the combustion of the organic material, EDTA [44] and the unstable carbon in the graphene structure [45], as well as the beginning of hydroxyapatite dehydroxylation [14,15]. The third stage, observed between 420°C and 600°C, with 1.22 wt.…”

Section: Morphological Characterizationmentioning

confidence: 99%

Electrochemical synthesis of nanosized hydroxyapatite/graphene composite powder

Mišković‐Stanković¹,

Eraković²,

Jankovic³

et al. 2015

Carbon letters

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Electrochemical synthesis was employed to prepare a novel hydroxyapatite/graphene (HAP/ Gr) composite powder suitable for medical applications as a hard tissue implant (scaffold). The synthesis was performed in a homogeneous dispersion containing Na 2 H 2 EDTA·2H 2 O, NaH 2 PO 4 and CaCl 2 with a Ca/EDTA/PO 4 3− concentration ratio of 0.25/0.25/0.15M, along with 0.01 wt% added graphene nanosheets, at a current density of 137 mA cm −2 and pH value of 9.0. The field emission scanning electron microscopy and transmission electron microscopy observations of the composite HAP/Gr powder indicated that nanosized hydroxyapatite particles were uniformly placed in the graphene overlay. Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction confirmed graphene incorporation in the HAP/Gr powder. The electrochemically prepared HAP/Gr composite powder exhibited slight antibacterial effect against the growth of the bacterial strain Staphylococcus aureus.

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“…Compared to the conventional methods, the most attractive features of sol-gel process include (a) molecularlevel homogeneity can be easily achieved through the mixing of two liquids; (b) the homogeneous mixture containing all the components in the correct stoichiometry and ensures a much higher purity; and, (c) a lower heat treatment temperature to form polycrystalline ceramics is usually achieved without resorting to a high excessive temperature. As a result, several synthesis routes have been proposed for sol-gel synthesis of HA and HA/YSZ as well as different mixing conditions with various molar ratios among reactants (Han et al, 2004;Bogdanoviciene et al, 2006). (Vasconcelos & Barreto, 2011).…”

Section: Sol-gel Synthesis and Powder Consolidation On The Sinterabilmentioning

confidence: 99%

New Challenges in the Sintering of HA/ZrO2 Composites

Vasconcelos¹

2012

Sintering of Ceramics - New Emerging Techniques

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Calcium hydroxyapatite, Ca10(PO4)6(OH)2 ceramics prepared by aqueous sol–gel processing

Cited by 112 publications

References 62 publications

Effect of metal-ion-to-fuel ratio on the phase formation of bioceramic phosphates synthesized by self-propagating combustion

Effect of metal-ion-to-fuel ratio on the phase formation of bioceramic phosphates synthesized by self-propagating combustion

Electrochemical synthesis of nanosized hydroxyapatite/graphene composite powder

New Challenges in the Sintering of HA/ZrO2 Composites

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