Carbonation and dehydroxylation of apatite during high energy milling of biphasic Ca-phosphate ceramics

Titorenkova, Rositsa; Dyulgerova, Elena; Petkova, V.; Ilieva, Radost

doi:10.1016/j.ceramint.2018.12.204

Cited by 20 publications

(12 citation statements)

References 28 publications

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“…These bands are consistent with a hydroxyapatite-type calcium phosphate (HA) [18][19][20][21] , agreeing with CP/CNT 1.0 g/L and CP/CNT 1.5 g/L powders. Likewise, the bands at 1418 cm −1 and 1463 cm −1 are present for the samples with the highest quantity of nanotubes, due to the vibration of the carbonate group (CO 3 2− ) that replaces the www.nature.com/scientificreports www.nature.com/scientificreports/ PO 4 3− groups in the structure of the HA, being an HA carbonated type B, where the carbonate replaces the phosphate groups instead of the hydroxyl groups (type A), because when the carbonated hydroxyapatite is type A, the bands are 1455-1545 cm −122, 23 .…”

Section: Discussionmentioning

confidence: 99%

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Montañez

Carreño

Escobar

et al. 2020

Sci Rep

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Polymers such as polycaprolactone (PCL) possess biodegradability, biocompatibility and affinitywith other organic media that makes them suitable for biomedical applications. in this work, a novel biocomposite coating was synthesised by mixing pcL with layers of calcium phosphate (hydroxyapatite, brushite and monetite) from a biomineral called otolith extracted from Teleost fish (Plagioscion Squamosissimus) and multiwalled carbon nanotubes in different concentrations (0.5, 1.0 and 1.5 g/L). The biocomposite coating was deposited on an osteosynthesis material Ti6Al4V by spin coating and various tests such as fourier transformation infrared spectroscopy (ftiR), Raman spectroscopy, scanning electron microscopy (SeM), transmission electron microscopy (teM), scratch tests, Mtt reduction cytotoxicity, HoS cell bioactivity (human osteosarcoma) by alkaline phosphatase (ALP) and fluorescence microscopy were performed to comprehensively evaluate the newly developed biocoating. it was found that an increase in the concentration of carbon nanotube induced microstructural phase changes of calcium phosphate (cp) leading to the formation of brushite, monetite and hydroxyapatite. While we discovered that an increase in the concentration of carbon nanotube generally improves the adhesion of the coating with the substrate, a certain threshold exists such that the best deposition surfaces were obtained as PCL/CP/CNT 0.0 g/L and PCL/CP/CNT 0.5 g/L.Metallic biomaterials used in implantology are usually inert, since there is no ion active exchange. This property allows the cells to recognize the microenvironment, proliferate and differentiate in a better way. For this reason, biocompatible materials in coatings such as calcium ceramics with a chemical nature like bone, or natural or synthetic polymers allows easy incorporation of bioactive materials or active ingredients making the recovery of hard tissue faster.One of the widely used polymers in tissue engineering is polycaprolactone (PCL -poly ε-caprolactone). It possesses semi-crystalline state, hydrophobic character, good solubility, low melting point, adequate degradation rate and excellent compatibility 1-3 , making it a good candidate for use as a biocoating material. One drawback as with many other polymers that the PCL has is its low mechanical strength which is proposed to be modified in this paper via addition of functionalised multiwalled carbon nanotubes (MWCNT) (Fig. 1). Recently, it has been shown that PCL and carbon nanotubes can forms an interface that improves certain properties in the composite 4 . Besides, carbon nanotubes can be functionalized, allowing other molecules to be adhered to the walls and ends, improving the properties of the materials. This strategy has been widely used to incorporate calcium phosphates (CP) like hydroxyapatite 5-7 , CaCO 3 2 or polymers for applications such as cancer treatment, drug transport, biotechnological applications and energy [8][9][10] . As Surmenev et al. indicate, much of the in vitro results of inorganic Ca-P coatings show...

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Section: Discussionmentioning

confidence: 99%

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Montañez

Carreño

Escobar

et al. 2020

Sci Rep

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“…Symmetrical doublet bands at 1421 cm −1 and 1473 cm −1 are associated with the carbonate CO 3 2− ion in the single structural environment for B-type CHA, which is the characteristic signal of the planar carbonate anions substituted the crystallographic site of tetragonal phosphates. Inevitable existence of AB-type remains in the materials synthesized via high energy milling method up to 100 h [55]. The transmittance intensity of carbonate vibrations at 1421 and 1471 cm −1 decreased with the incretion of K 2 CO 3 amount, indicating the carbonate content is increased gradually from 1.6 wt% to 4.7 wt%.…”

Section: Effect Of Carbonate Source On the Structure Of Carbonated Hy...mentioning

confidence: 93%

Pourbaix-Guided Mineralization and Site-Selective Photoluminescence Properties of Rare Earth Substituted B-Type Carbonated Hydroxyapatite Nanocrystals

Liu

Yuan

et al. 2021

Molecules

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Rare-earth labeling in biological apatite could provide critical information for the pathologic transition (osteoclastic) and physiologic regeneration (osteogenesis) of bone and teeth because of their characteristic site-sensitive fluorescence in different coordinative conditions of various tissues in many biological processes. However, the rare-earth labeling method for biological apatites, i.e., carbonated-hydroxyapatite, has been rarely found in the literature. In this paper, we report a Pourbaix-diagram guided mineralizing strategy to controllable carbonation and doping of rare-earth ions in the hydroxyapatite (HA) lattice. The carbonation process of hydroxyapatite was achieved by controllable mineralization in hydrothermal condition with K2CO3 as the carbonate source, which results into the pure B-type carbonated hydroxyapatite (CHA) with tunable carbonate substitution degree. All of the as-synthesized materials crystalized into P63/m (No. 176) space group with the lattice parameter of a decreases and c increases with the increasing of carbonate content in the reactants. Structural refinement results revealed that the substitution of planar CO32− is superimposed on one of the faces of PO43− tetrahedral sub-units with a rotation angle of 30° in reference to c-axis. All of the hydrothermally synthesized CHA nanocrystals show hexagonal rod-like morphology with the length of 70–110 nm and diameter of 21–35 nm, and the decreasing length/diameter ratio from 3.61 to 2.96 from low to high carbonated level of the samples. Five rare-earth cations, of Pr3+, Sm3+, Eu3+, Tb3+, and Ho3+, were used as possible probe ions that can be doped into either HA or CHA lattice. The site-preference of Tb3+ doping is the same in the crystallographic site of HA and CHA according to characteristic emission peaks of 5D4–7Fj (j = 3–6) transitions in their photoluminescent spectroscopy. Our work provides a controllable carbonation method for rare-earth labeling hydroxyapatite nanomaterials with potential biologically active implant powders for bone repair and tissue regeneration.

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“…The bands at 3502 cm -1 and 1648 cm -1 are assigned as symmetric stretching vibration and symmetric bending vibration, respectively of structurally bonded O-H. At 647 cm -1 is situated libration mode of structural bonded OH − [40,41,43,44].…”

Section: Ftir Spectroscopymentioning

confidence: 99%

TG/DTG-DSC and high temperature in-situ XRD analysis of natural thaumasite

et al. 2021

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This paper investigated thermal properties of natural thaumasite, such as phase composition and reaction mechanism of thermal decomposition using simultaneous TG/DTG-DSC in Ar and Air medium up to 1673 K, coupled with masspectrometer for analysis of evolving gases, and in-situ powder X-ray diffraction measurements. The transitional solid phases, grown with increasing of temperature at thaumasite thermal decomposition, are calcium hydrogen carbonate (Ca(HCO 3) 2) and hydrogen sulphate (Ca(HSO 4) 2), calcite, anhydrite, calcium silicates (wolastonite and larnite), calcium silico-carbonate (spurrite), and calcium silico-sulphate (ternesite). The thermal decomposition in both gaseous media includes the stages of dehydration, dehydroxylation, dacarbonation and desulphuration with obtaining a solid residue of varying degrees of crystallinity. The main solid phase, grown at the highest temperatures, is larnite. Based on the obtained results it was proposed the scheme of chemical reactions, which presents the reaction mechanism of thaumasite thermal decomposition. The defined scheme has both fundamental importance by adding new details of reference data, and practical application for thaumasite identification in chemical archaeology, and in the chemistry of cement and cement-based materials.

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Carbonation and dehydroxylation of apatite during high energy milling of biphasic Ca-phosphate ceramics

Cited by 20 publications

References 28 publications

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Pourbaix-Guided Mineralization and Site-Selective Photoluminescence Properties of Rare Earth Substituted B-Type Carbonated Hydroxyapatite Nanocrystals

TG/DTG-DSC and high temperature in-situ XRD analysis of natural thaumasite

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