Effect of processing conditions on the crystallinity and structure of carbonated calcium hydroxyapatite (CHAp)

Garškaité, Edita; Gross, Kārlis Agris; Yang, Sung Wei; Yang, Thomas C.-K.; Yang, Jen Chang; Kareiva, Aivaras

doi:10.1039/c4ce00119b

Cited by 126 publications

(82 citation statements)

References 42 publications

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“…Calcium hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , CHA) is very important macroporous bone mineral (55-70% interconnected porosity) from the scientific point of view and view of application [1][2][3][4]. Synthetic calcium hydroxyapatite is used as bioceramic coating for medical implants due to excellent biocompatibility and osteoconductivity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of sol–gel derived calcium hydroxyapatite thin films spin-coated on silicon substrate

Malakauskaite-Petruleviciene

Stankevičiūtė

Niaura

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of sol–gel derived calcium hydroxyapatite thin films spin-coated on silicon substrate

Malakauskaite-Petruleviciene

Stankevičiūtė

Niaura

et al. 2015

Ceramics International

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“…6). 2,39 The absorption bands in the regions of 1190-900 cm -1 are due to the triply degenerated asymmetric stretching mode, ) appears due to the adsorbed water molecules. The assignment of all obtained bands in FT-IR spectra is summarised in Table 3.…”

Section: Structure and Carbonate Determination Through Ir Spectroscopymentioning

confidence: 99%

“…09-0432, hexagonal crystal system, space group of P63/m) which is consistent with literature (data not presented). 2 The crystallite size for powders annealed at 600, 680 and 800 °C was calculated to be 17, 22 and 26 ± 1 nm, respectively. The unit cell parameters a = b and c of HAP (PEG) were calculated to be 9.439 Å and 6.898 Å, respectively.…”

Section: Crystallinity and Phase Purity Of Bulk Samplesmentioning

confidence: 99%

“…15 The degree of crystallinity can also be varied by changing the post-synthetic annealing temperature. 2,16 Generally, the higher the annealing temperature is, the higher degree of crystallinity is observed. Studies performed by Juang and Hon demonstrated a poor resorbability of sintered hydroxyapatite-based materials and that was attributed to the loss of nanocrystallinity.…”

Section: Introductionmentioning

confidence: 99%

“…1 The carbonate groups can substitute both the hydroxyl (OH -) and the phosphate (PO4 3-) ions, resulting to the A-type (Ca10(PO4)6(OH)2-2x(CO3)x, where 0 ≤ x ≤ 1) and B-type (Ca10-y(PO4)6-y(CO3)x(OH)2-x, where 0 ≤ y ≤ 2) carbonation, respectively. [2][3][4] The presence of carbonate ions in the apatite crystal lattice not only defines the properties of produced material, but also determines the biological responses. For instance, it has been reported that as the carbonate content is increased, the sintering temperature required for a given degree of densification is decreased.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a composite of nanocrystalline carbonated hydroxyapatite (cHAP) with polylactic acid (PLA) and its surface topographical structuring with direct laser writing (DLW)

et al. 2016

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The fabrication of polylactic acid (PLA)-carbonated hydroxyapatite (cHAP) composite material from synthesised phase pure nano-cHAP and melted PLA by mechanical mixing at 220-235 °C has been developed in this study. Topographical structuring of PLA-cHAP composite surfaces was performed by direct laser writing (DLW). Microstructured surfaces and the apatite distribution within the composite and formed grooves were evaluated by optical and scanning electron microscopies. The influence of the dopant concentration as well as the laser power and translation velocity on the composite surface morphology is discussed. The synthesis of carbonated hydroxyapatite (cHAP) nanocrystalline powders via wet chemistry approach from calcium acetate and diammonium hydrogen phosphate precursors together with crosslinking and complexing agents of polyethylene glycol, poly(vinyl alcohol) and triethanolamine is also reported.Thermal decomposition of the gels and formation of nanocrystalline cHAP were evaluated by thermal analysis, mass spectrometry and dilatometry measurements. The effect of organic additives on the formation and morphological features of cHAP was investigated. The phase purity and crystallinity of the carbonated apatite powders were evaluated by X-ray diffraction analysis and FT-IR spectroscopy.2

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Surface organo‐modification of hydroxyapatites to improvePLA/HAcompatibility

Rocha

Chávez‐Flores

Zuverza‐Mena

et al. 2020

J of Applied Polymer Sci

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Polylactide/hydroxyapatite (PLA/HA) composites are promising tissue engineering materials because of the PLA biodegradability and HA as a natural bone component. PLA/HA composites without HA modification lead to mechanical failure due to the interfacial immiscibility. In this study, an effective chemical surface methodology is used to modify HA to obtain PLA/HA composites with superior mechanical properties. The HA particles are modified with fatty acids (adipic, sebacic, lauric, and linoleic) and incorporated into a PLA matrix by polymer solution casting, using chloroform as the solvent. After the HA modification, the films exhibited an improvement in tensile strength, elongation at break, and elastic modulus. Yet, the best results observed are by sebacic and adipic acid modification. These increments are attributed to a higher affinity of the organo‐modified HA particles within the PLA matrix. Therefore, the development of materials for osteo‐regeneration engineering based on these systems is quite promising.

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Effect of processing conditions on the crystallinity and structure of carbonated calcium hydroxyapatite (CHAp)

Cited by 126 publications

References 42 publications

Synthesis and characterization of sol–gel derived calcium hydroxyapatite thin films spin-coated on silicon substrate

Synthesis and characterization of sol–gel derived calcium hydroxyapatite thin films spin-coated on silicon substrate

Fabrication of a composite of nanocrystalline carbonated hydroxyapatite (cHAP) with polylactic acid (PLA) and its surface topographical structuring with direct laser writing (DLW)

Surface organo‐modification of hydroxyapatites to improvePLA/HAcompatibility

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