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Wang Y, Lu G, Qiu Y, Sun W, Qin S, Lin Y, Deng B, Zhang D, Yu R. Synthesis and optical properties of novel apatite-type NaCa3Bi(PO4)3F:Dy3+ yellow-emitting fluorophosphate phosphors for white LEDs. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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2
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Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment. J CHEM-NY 2021. [DOI: 10.1155/2021/3833737] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). The synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). The removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. The combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. The HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. The thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. This work confirms the potential of HAP-clay composites in removing MB from water.
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3
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Comparative Study of Technologies for Tubule Occlusion and Treatment of Dentin Hypersensitivity. J Funct Biomater 2021; 12:jfb12020027. [PMID: 33925548 PMCID: PMC8167718 DOI: 10.3390/jfb12020027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 04/21/2021] [Accepted: 04/23/2021] [Indexed: 11/17/2022] Open
Abstract
This study aimed to evaluate the occluding/remineralization performance and resistance to acid attacks of the mineralization layer formed by a tooth-desensitizing gel containing amorphous calcium magnesium phosphate (ACMP) particles and compare it to six other desensitizing products available on the market. Similar comprehensive studies are few and there is especially a lack of studies that are up to date. A dentin-disc model was used for in vitro evaluation of the desensitizing toothpastes/gels. Application of the products was performed twice daily for seven days. One set of specimens were evaluated using scanning electron microscopy (SEM) directly after the final treatment and another set was evaluated after an acid challenge, exposing specimens to 2 wt% citric acid. The ACMP desensitizing gel was the only product resulting in complete occlusion by the formation of mineralized material on the dentin surface and inside the tubules. Particle deposition was dominant after treatment with the other desensitizing products, with little or no mineralization, resulting in partial occlusion only. Sensodyne Repair & Protect and Oral-B Pro-Expert showed the highest resistance toward acid attacks. Material inside the tubules remained relatively unaffected by acid attacks in all specimens. The results in this study indicated a great variability among the occluding agents in terms of occlusion and acid resistance of the mineralization layer. The high degree of occlusion and intra-tubular mineralization that could mitigate the effect of acid solubilization indicate that the ACMP desensitizing gel may be a superior option for the treatment of dentin hypersensitivity.
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4
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Nanostructured Strontium-Doped Calcium Phosphate Cements: A Multifactorial Design. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11052075] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Calcium phosphate cements (CPCs) have been extensively studied in last decades as nanostructured biomaterials for the regeneration of bone defects, both for dental and orthopedic applications. However, the precise control of their handling properties (setting time, viscosity, and injectability) still represents a remarkable challenge because a complicated adjustment of multiple correlated processing parameters is requested, including powder particle size and the chemical composition of solid and liquid components. This study proposes, for the first time, a multifactorial investigation about the effects of powder and liquid variation on the final performance of Sr-doped apatitic CPCs, based on the Design of Experiment approach. In addition, the effects of two mixing techniques, hand spatula (low-energy) and planetary shear mixing (high-energy), on viscosity and extrusion force were compared. This work aims to shed light on the various steps involved in the processing of CPCs, thus enabling a more precise and tailored design of the device, based on the clinical need.
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Degli Esposti L, Markovic S, Ignjatovic N, Panseri S, Montesi M, Adamiano A, Fosca M, Rau JV, Uskoković V, Iafisco M. Thermal crystallization of amorphous calcium phosphate combined with citrate and fluoride doping: a novel route to produce hydroxyapatite bioceramics. J Mater Chem B 2021; 9:4832-4845. [PMID: 33998626 DOI: 10.1039/d1tb00601k] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Amorphous calcium phosphate (ACP) is a material of high interest for dentistry, orthopedics, and other biomedical sectors. Being intrinsically metastable, the process of transformation of ACP into a crystalline phase upon heating is of high relevance for the development of innovative bioceramics. Here we have first studied the thermal behavior of a citrate-stabilized ACP (Cit-ACP) also doped with fluoride ions (Cit-FACP) prepared at three different nominal Cit/Ca ratios (i.e. 4, 2, 1) by differential thermal analysis. Next, the physico-chemical features of the crystalline products as well as the in vitro cell response to the materials were investigated. A citrate and fluoride free ACP sample was also tested as the blank. We have found that the activation energy of crystallization of Cit-(F)ACP samples is lower in comparison to the blank ACP and this is influenced by the nominal Cit/Ca molar ratio. Interestingly, we have discovered that the thermal treatment of Cit-(F)ACP at 800 °C yields hydroxyapatite (HA) or fluorapatite (FHA) as the main products differently from blank ACP that, like most of the ACPs reported in the literature, yields β-tricalcium phosphate. This was attributed to the Ca/P ratio of Cit-(F)ACP, which is similar to HA. A study of the crystalline products has revealed that all the (F)HA samples were non-cytotoxic, and retained carbonate ions in the crystal structure despite the heat treatment that should have induced decarbonation. The morphology of the products is influenced by the nominal Cit/Ca ratio and the presence of fluoride, ranging from spherical nanoparticles to micrometric hexagonal rods. Overall, our results prove that the thermal crystallization of Cit-(F)ACP is markedly different from classic ACP based materials and the thermal treatment of Cit-(F)ACP represents an attractive route for producing pure bioactive HA ceramics.
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Affiliation(s)
- Lorenzo Degli Esposti
- Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), Via Granarolo 64, 48018 Faenza, Italy.
| | - Smilja Markovic
- Institute of Technical Sciences of the Serbian Academy of Science and Arts, Knez Mihailova 35/IV, P. O. Box 377, 11000 Belgrade, Serbia
| | - Nenad Ignjatovic
- Institute of Technical Sciences of the Serbian Academy of Science and Arts, Knez Mihailova 35/IV, P. O. Box 377, 11000 Belgrade, Serbia
| | - Silvia Panseri
- Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), Via Granarolo 64, 48018 Faenza, Italy.
| | - Monica Montesi
- Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), Via Granarolo 64, 48018 Faenza, Italy.
| | - Alessio Adamiano
- Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), Via Granarolo 64, 48018 Faenza, Italy.
| | - Marco Fosca
- Institute of Structure of Matter (ISM), National Research Council (CNR), Via del Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Julietta V Rau
- Institute of Structure of Matter (ISM), National Research Council (CNR), Via del Fosso del Cavaliere 100, 00133 Rome, Italy and Sechenov First Moscow State Medical University, Institute of Pharmacy, Department of Analytical, Physical and Colloid Chemistry, Trubetskaya 8, Build. 2, 119991 Moscow, Russia
| | | | - Michele Iafisco
- Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), Via Granarolo 64, 48018 Faenza, Italy.
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6
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Siddiqui HA, Pickering KL, Mucalo MR. Study of biomorphic calcium deficient hydroxyapatite fibres derived from a natural Harakeke( Phormium tenax) leaf fibre template. BIOINSPIRATION & BIOMIMETICS 2020; 16:016015. [PMID: 32987371 DOI: 10.1088/1748-3190/abbc64] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 09/28/2020] [Indexed: 06/11/2023]
Abstract
The complex structure of natural bio-organic matter has inspired scientists to utilise these as templates to design 'biomorphic materials', which retain the intricate architecture of the materials while acting as a useful bioactive material. Biomorphic hydroxyapatite-based fibres were synthesised usingHarakekeleaf fibre as a template, which constitutes a powerful method for manufacturing bioactive ceramic fibres. Furthermore, in creating the hydroxyapatite-based fibres, a natural source of calcium and phosphate ions (from bovine bone) was utilised to create the digest solution in which the leaf fibres were immersed prior to their calcination to form the inorganic fibres. Chemical, thermogravimetric and microscopic characterisation confirmed that the final product was able to successfully replicate the shape of the fibres and furthermore be transformed into calcium deficient, bone-like hydroxyapatite.
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Affiliation(s)
- Humair A Siddiqui
- School of Engineering, University of Waikato, Hamilton 3240, New Zealand
- Department of Materials Engineering, Faculty of Chemical & Process Engineering, NED University of Engineering & Technology, Karachi 75270, Pakistan
| | - Kim L Pickering
- School of Engineering, University of Waikato, Hamilton 3240, New Zealand
| | - Michael R Mucalo
- School of Science, University of Waikato, Hamilton 3240, New Zealand
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7
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Robin M, Von Euw S, Renaudin G, Gomes S, Krafft JM, Nassif N, Azaïs T, Costentin G. Insights into OCP identification and quantification in the context of apatite biomineralization. CrystEngComm 2020. [DOI: 10.1039/c9ce01972c] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monitoring apatite formation throughin situRAMAN andex situssNMR spectroscopy.
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Affiliation(s)
- Marc Robin
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
| | - Stanislas Von Euw
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
| | - Guillaume Renaudin
- Université Clermont Auvergne
- CNRS
- ICCF
- SIGMA Clermont
- F-63000 Clermont-Ferrand
| | - Sandrine Gomes
- Université Clermont Auvergne
- CNRS
- ICCF
- SIGMA Clermont
- F-63000 Clermont-Ferrand
| | - Jean-Marc Krafft
- Sorbonne Université
- CNRS
- Laboratoire Réactivité de Surface
- LRS
- F-75005 Paris
| | - Nadine Nassif
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
| | - Thierry Azaïs
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
| | - Guylène Costentin
- Sorbonne Université
- CNRS
- Laboratoire Réactivité de Surface
- LRS
- F-75005 Paris
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8
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Rare-earth (Gd 3+,Yb 3+/Tm 3+, Eu 3+) co-doped hydroxyapatite as magnetic, up-conversion and down-conversion materials for multimodal imaging. Sci Rep 2019; 9:16305. [PMID: 31705047 PMCID: PMC6841688 DOI: 10.1038/s41598-019-52885-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 10/23/2019] [Indexed: 11/09/2022] Open
Abstract
Taking advantage of the flexibility of the apatite structure, nano- and micro-particles of hydroxyapatite (HAp) were doped with different combinations of rare earth ions (RE3+ = Gd, Eu, Yb, Tm) to achieve a synergy among their magnetic and optical properties and to enable their application in preventive medicine, particularly diagnostics based on multimodal imaging. All powders were synthesized through hydrothermal processing at T ≤ 200 °C. An X-ray powder diffraction analysis showed that all powders crystallized in P63/m space group of the hexagonal crystal structure. The refined unit-cell parameters reflected a decrease in the unit cell volume as a result of the partial substitution of Ca2+ with smaller RE3+ ions at both cation positions. The FTIR analysis additionally suggested that a synergy may exist solely in the triply doped system, where the lattice symmetry and vibration modes become more coherent than in the singly or doubly doped systems. HAp:RE3+ optical characterization revealed a change in the energy band gap and the appearance of a weak blue luminescence (λex = 370 nm) due to an increased concentration of defects. The "up"- and the "down"-conversion spectra of HAp:Gd/Yb/Tm and HAp:Gd/Eu powders showed characteristic transitions of Tm3+ and Eu3+, respectively. Furthermore, in contrast to diamagnetic HAp, all HAp:RE3+ powders exhibited paramagnetic behavior. Cell viability tests of HAp:Gd/Yb/Tm and HAp:Gd/Eu powders in human dental pulp stem cell cultures indicated their good biocompatibility.
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9
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Tampieri A, Ruffini A, Ballardini A, Montesi M, Panseri S, Salamanna F, Fini M, Sprio S. Heterogeneous chemistry in the 3-D state: an original approach to generate bioactive, mechanically-competent bone scaffolds. Biomater Sci 2019; 7:307-321. [PMID: 30468436 DOI: 10.1039/c8bm01145a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The present work investigates heterogeneous gas-solid reactions involved in the biomorphic transformation of natural wood into large 3-D hydroxyapatite (HA) scaffolds recapitulating physico-chemical, morphological and mechanical features typical of natural bone. In particular, we found that the use of a reactive CO2/H2O gas mixture, under supercritical conditions at high pressure, permits to control heterogeneous CaO-CO2 reactions throughout the whole bulk and to direct the nucleation-growth of CaCO3 at a relatively low temperature, thus obtaining a highly reactive 3-D precursor enabling the formation of a large biomorphic HA scaffold preserving fine nanostructure by a hydrothermal process. To the best of our knowledge, the application of heterogeneous chemical reactions in the 3-D state is an original way to generate large HA scaffolds maintaining bio-relevant ionic substitutions, with specific regard to Mg2+, Sr2+ and CO32- ions, conferring a superior ability to guide cell fate. We hypothesize that the original nanostructure of the final 3-D HA scaffold, not achievable by the classic sintering procedure, and the multi-scale hierarchical organization inherited by the original template, account for its high compression strength with damage-tolerant mechanical behaviour. The ability of the new scaffold to induce bone regeneration is attested by the overexpression of genes, early and late markers of the osteogenic differentiation pathway, and by the in vivo osteoinductivity. We hypothesize that the unique association of bioactive chemical composition, nanostructure and multi-scale hierarchy can synergistically act as instructing signals for cells to generate new bone tissue with organized 3-D architecture. These results point to its great applicative potential for the regeneration of large bone defects, which is a still unmet clinical need.
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Affiliation(s)
- Anna Tampieri
- Institute of Science and Technology for Ceramics, National Research Council, Via Granarolo 64, 48018 Faenza, Italy.
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Riley BJ, McFarlane J, DelCul GD, Vienna JD, Contescu CI, Forsberg CW. Molten salt reactor waste and effluent management strategies: A review. NUCLEAR ENGINEERING AND DESIGN 2019. [DOI: 10.1016/j.nucengdes.2019.02.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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Stock SR, Laugesen M, Birkedal H, Jakus A, Shah R, Park JS, Almer JD. Precision lattice parameter determination from transmission diffraction of thick specimens with irregular cross sections. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576718017132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Accurate determination of lattice parameters from X-ray diffraction requires that the diffraction angles be measured very precisely, and significant errors result if the sample–detector separation differs from that assumed. Transmission diffraction from bones, which have a complex cross section and must be left intact, is a situation where this separation is difficult to measure and it may differ from position to position across the specimen. This article describes a method for eliminating the effect of variable sample cross section. Diffraction patterns for each position on the specimen are collected before and after 180° rotation about an axis normal to the cross section of interest. This places the centroid of the diffracting mass at the center of rotation and provides the absolute lattice parameters from the average apparent lattice parameters at the two rotation angles. Diffraction patterns were collected across the cross section of three specimens: a 3D-printed elliptical cylinder of Hyperelastic Bone (HB), which is composed primarily of synthetic hydroxyapatite (hAp), a 3D-printed HB model of the second metacarpal bone (Mc2), and a modern human Mc2 containing nanocrystalline carbonated apatite (cAp). Rietveld refinement was used to determine precise unit-cell parameters a
apparent and c
apparent for each pattern of each scan, and these values determined the actual average 〈a〉 and 〈c〉 for each sample. The results indicate that the 0°/180° rotation method works well enough to uncover variations approaching 1 × 10−3 Å in cAp unit-cell parameters in intact bones with irregular cross sections.
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12
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Chai K, Cheng S, Li H, Dai B. Modulation of perovskite-related frameworks induced by alkaline earth metals in phosphate fluorides A 2MPO 4F (A = K, Rb; M = Ba, Ca). NEW J CHEM 2019. [DOI: 10.1039/c9nj01051c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A2CaPO4F (A = K, Rb) are isomorphs. The 1D zig-zag [FA4Ca2]∞ chains in the two compounds belong to the 1D perovskite-related structure.
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Affiliation(s)
- Kun Chai
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- School of Chemistry and Chemical Engineering
- Shihezi University
- Shihezi 832003
- China
| | - Shichao Cheng
- School of Physical Science and Technology
- Xinjiang University
- Urumqi 830046
- China
| | - Hongyi Li
- Quality of Products Supervision & Inspection Institute of Technology
- Xinjiang Uygur Autonomous
- China
| | - Bin Dai
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- School of Chemistry and Chemical Engineering
- Shihezi University
- Shihezi 832003
- China
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13
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Gomes S, Vichery C, Descamps S, Martinez H, Kaur A, Jacobs A, Nedelec JM, Renaudin G. Cu-doping of calcium phosphate bioceramics: From mechanism to the control of cytotoxicity. Acta Biomater 2018; 65:462-474. [PMID: 29066420 DOI: 10.1016/j.actbio.2017.10.028] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 10/09/2017] [Accepted: 10/17/2017] [Indexed: 02/08/2023]
Abstract
In this study, the Cu-doping mechanism of Biphasic Calcium Phosphate (BCP) was thoroughly investigated, as was its ionic release behavior, in order to elucidate cytotoxicity features of these bioceramics. BCP are composed of hydroxyapatite (Ca10(PO4)6(OH)2) and β-TCP (Ca3(PO4)2). The two phases present two different doping mechanisms. Incorporation into the β-TCP structure is achieved at around 700 °C thanks to a substitution mechanism leading to the Cu-doped Ca3-xCux(PO4)2 compound. Incorporation into the HAp structure is achieved thanks to an interstitial mechanism that is limited to a Cu-poor HAp phase for temperatures below 1100 °C (Ca10Cux(PO4)6(OH)2-2xO2x with x < 0.1). Above 1100 °C, the same interstitial mechanism leads to the formation of a Cu-rich HAp mixed-valence phase (Ca10Cu2+xCu+y(PO4)6(OH)2-2x-yO2x+y with x + y ∼ 0.5). The formation of both high-temperature Cu-doped α-TCP and Cu3(PO4)2 phases above 1100 °C induces a transformation into the Cu-rich HAp phase on cooling. The linear OCuO oxocuprate entity was confirmed by EXAFS spectroscopy, and the mixed Cu+/Cu2+ valence was evidenced by XPS analyses. Ionic releases (Cu+/Cu2+, Ca2+, PO42- and OH-) in water and in simulated body media were investigated on as-synthesized ceramics to establish a pretreatment before biological applications. Finally the cytotoxicity of pretreated disks was evaluated, and results confirm that Cu-doped BCP samples are promising bioceramics for bone substitutes and/or prosthesis coatings. STATEMENT OF SIGNIFICANCE Biphasic Calcium Phosphates (BCP) are bioceramics composed of hydroxyapatite (HAp, Ca10(PO4)6(OH)2) and beta-Tricalium Phosphate (β-TCP, Ca3(PO4)2). Because their chemical and mineral composition closely resembles that of the mineral component of bone, they are potentially interesting candidates for bone repair surgery. Doping can advantageously be used to improve their biological behaviors; however, it is important to describe the doping mechanism of BCP thoroughly in order to fully appraise the benefit of the doping process. The present paper scrutinizes in detail the incorporation of copper cation in order to correctly interpret the behavior of the Cu-doped bioceramic in biological fluid. The understanding of the copper doping mechanism, related to doping mechanism of others 3d-metal cations, makes it possible to explain the rates and kinetic of release of the dopant in biological medium. Finally, the knowledge of the behavior of the copper doped ceramic in biological environment allowed the tuning of its cytotoxicity properties. The present study resulted on pre-treated ceramic disks which have been evaluated as promising biocompatible ceramic for bone substitute and/or prosthesis coating: good adherence of bone marrow cells with good cell viability.
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14
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Renaudin G, Gomes S, Nedelec JM. First-Row Transition Metal Doping in Calcium Phosphate Bioceramics: A Detailed Crystallographic Study. MATERIALS (BASEL, SWITZERLAND) 2017; 10:E92. [PMID: 28772452 PMCID: PMC5344588 DOI: 10.3390/ma10010092] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/06/2017] [Accepted: 01/18/2017] [Indexed: 11/16/2022]
Abstract
Doped calcium phosphate bioceramics are promising materials for bone repair surgery because of their chemical resemblance to the mineral constituent of bone. Among these materials, BCP samples composed of hydroxyapatite (Ca10(PO₄)₆(OH)₂) and β-TCP (Ca₃(PO₄)₂) present a mineral analogy with the nano-multi-substituted hydroxyapatite bio-mineral part of bones. At the same time, doping can be used to tune the biological properties of these ceramics. This paper presents a general overview of the doping mechanisms of BCP samples using cations from the first-row transition metals (from manganese to zinc), with respect to the applied sintering temperature. The results enable the preparation of doped synthetic BCP that can be used to tailor biological properties, in particular by tuning the release amounts upon interaction with biological fluids. Intermediate sintering temperatures stabilize the doping elements in the more soluble β-TCP phase, which favors quick and easy release upon integration in the biological environment, whereas higher sintering temperatures locate the doping elements in the weakly soluble HAp phase, enabling a slow and continuous supply of the bio-inspired properties. An interstitial doping mechanism in the HAp hexagonal channel is observed for the six investigated cations (Mn2+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+) with specific characteristics involving a shift away from the center of the hexagonal channel (Fe3+, Co2+), cationic oxidation (Mn3+, Co3+), and also cationic reduction (Cu⁺). The complete crystallochemical study highlights a complex HAp doping mechanism, mainly realized by an interstitial process combined with calcium substitution for the larger cations of the series leading to potentially calcium deficient HAp.
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Affiliation(s)
- Guillaume Renaudin
- Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France.
| | - Sandrine Gomes
- Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France.
| | - Jean-Marie Nedelec
- Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France.
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15
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Sprio S, Dapporto M, Montesi M, Panseri S, Lattanzi W, Pola E, Logroscino G, Tampieri A. Novel Osteointegrative Sr-Substituted Apatitic Cements Enriched with Alginate. MATERIALS (BASEL, SWITZERLAND) 2016; 9:E763. [PMID: 28773884 PMCID: PMC5457115 DOI: 10.3390/ma9090763] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 08/29/2016] [Accepted: 09/02/2016] [Indexed: 12/16/2022]
Abstract
The present work describes the synthesis of novel injectable, self-setting bone cements made of strontium-substituted hydroxyapatite (Sr-HA), obtained by single-phase calcium phosphate precursors doped with different amounts of strontium and enriched with alginate. The addition of alginate improved the injectability, cohesion, and compression strength of the cements, without affecting the hardening process. A Sr-HA cement exhibiting adequate hardening times and mechanical strength for clinical applications was further tested in vivo in a rabbit model, in comparison with a commercial calcium phosphate cement, revealing the maintenance of biomimetic composition and porous microstructure even after one month in vivo, as well as enhanced ability to induce new bone formation and penetration.
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Affiliation(s)
- Simone Sprio
- Institute of Science and Technology for Ceramics, National Research Council of Italy, Via Granarolo 64, Faenza 48018, Italy.
| | - Massimiliano Dapporto
- Institute of Science and Technology for Ceramics, National Research Council of Italy, Via Granarolo 64, Faenza 48018, Italy.
| | - Monica Montesi
- Institute of Science and Technology for Ceramics, National Research Council of Italy, Via Granarolo 64, Faenza 48018, Italy.
| | - Silvia Panseri
- Institute of Science and Technology for Ceramics, National Research Council of Italy, Via Granarolo 64, Faenza 48018, Italy.
| | - Wanda Lattanzi
- Institute of Anatomy and Cell Biology, Università Cattolica del Sacro Cuore, Largo F Vito, 1, Rome 00168, Italy.
- Latium Musculoskeletal Tissue Bank, Largo F Vito, 1, Rome 00168, Italy.
| | - Enrico Pola
- Orthopaedics and Traumatology, Università Cattolica del Sacro Cuore, Largo F Vito, 1, Rome 00168, Italy.
| | - Giandomenico Logroscino
- Orthopaedics and Traumatology, Università Cattolica del Sacro Cuore, Largo F Vito, 1, Rome 00168, Italy.
| | - Anna Tampieri
- Institute of Science and Technology for Ceramics, National Research Council of Italy, Via Granarolo 64, Faenza 48018, Italy.
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Lübke A, Enax J, Wey K, Fabritius HO, Raabe D, Epple M. Composites of fluoroapatite and methylmethacrylate-based polymers (PMMA) for biomimetic tooth replacement. BIOINSPIRATION & BIOMIMETICS 2016; 11:035001. [PMID: 27159921 DOI: 10.1088/1748-3190/11/3/035001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Synthetic composite materials that mimic the structure and composition of mammalian tooth enamel were prepared by mixing fluoroapatite rods (diameter 2-3 μm, thickness about 0.5 μm) and methylmethacrylate (MMA), followed by polymerization either during or immediately after ultracentrifugation, using either a tertiary amine/radical initiator for polymerization at room temperature or a radical initiator for thermal polymerization. This led to mineral-rich composites (mineral content between 50 and 75 wt%). To enhance the mechanical stability and the interaction between fluoroapatite and polymer matrix, small amounts of differently functionalized MMA monomers were added to the co-monomer mixture. Another approach was the coating of the fluoroapatite rods with silica and the polymerization in the presence of a siloxane-functionalized MMA monomer. The hardness of the composites was about 0.2-0.4 GPa as determined by Vickers indentation tests, about 2 times higher than the polymer matrix alone. The composites had a good resistance against acids (60 min at pH 3, 37 °C).
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Affiliation(s)
- Alwina Lübke
- Institute of Inorganic Chemistry and Centre for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, D-45117 Essen, Germany
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17
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Frølich S, Leemreize H, Jakus A, Xiao X, Shah R, Birkedal H, Almer JD, Stock SR. Diffraction tomography and Rietveld refinement of a hydroxyapatite bone phantom. J Appl Crystallogr 2016. [DOI: 10.1107/s1600576715022633] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A model sample consisting of two different hydroxyapatite (hAp) powders was used as a bone phantom to investigate the extent to which X-ray diffraction tomography could map differences in hAp lattice constants and crystallite size. The diffraction data were collected at beamline 1-ID, the Advanced Photon Source, using monochromatic 65 keV X-radiation, a 25 × 25 µm pinhole beam and translation/rotation data collection. The diffraction pattern was reconstructed for each volume element (voxel) in the sample, and Rietveld refinement was used to determine the hAp lattice constants. The crystallite size for each voxel was also determined from the 00.2 hAp diffraction peak width. The results clearly show that differences between hAp powders could be measured with diffraction tomography.
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Abstract
Phosphate is added to drinking water in the UK to minimise the release of lead from lead water pipes. The phosphate encourages the formation of insoluble lead apatites on the walls of the pipe. Hydroxylpyromorphite Pb5(PO4)3OH is the lead apatite that is most often used to model lead levels in tap water; however, its presence has not been confirmed. Our aims were to identify the lead pipe apatite and synthesise it. The synthetic mineral would then be used in future solubility studies to produce better predictions of lead levels in tap water. XRD and FTIR were used to characterise the minerals on a range of lead pipes. Pyromorphite and hydroxylpyromorphite were absent and instead a range of mixed calcium lead apatites were present. For every five lead ions in the general formula Pb5(PO4)3X between one and two ions were replaced with calcium and there was evidence of substitution ofPO43-by eitherCO32-orHPO42-. Calcium lead apatites with similar unit cell dimensions to those found on lead water pipes were then synthesised. The calcium : lead ratio in these reaction mixtures was in excess of 500 : 1 and the resulting crystals were shown by TEM to be nanosized rods and flakes. The synthetic apatites that most closely resembled the unit cell dimensions of the apatites on lead water pipes were shown to be Pb3.4Ca1.3(PO4)3Cl0.03OH0.97, Pb3.6Ca1.2(PO4)3Cl0.07OH0.93, and Pb3.6Ca1.2(PO4)3Cl0.27OH0.73.
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19
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Dorozhkin SV. Calcium orthophosphates (CaPO 4): occurrence and properties. Prog Biomater 2015; 5:9-70. [PMID: 27471662 PMCID: PMC4943586 DOI: 10.1007/s40204-015-0045-z] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 11/05/2015] [Indexed: 01/02/2023] Open
Abstract
The present overview is intended to point the readers' attention to the important subject of calcium orthophosphates (CaPO4). This type of materials is of the special significance for the human beings because they represent the inorganic part of major normal (bones, teeth and antlers) and pathological (i.e., those appearing due to various diseases) calcified tissues of mammals. For example, atherosclerosis results in blood vessel blockage caused by a solid composite of cholesterol with CaPO4, while dental caries and osteoporosis mean a partial decalcification of teeth and bones, respectively, that results in replacement of a less soluble and harder biological apatite by more soluble and softer calcium hydrogenorthophosphates. Therefore, the processes of both normal and pathological calcifications are just an in vivo crystallization of CaPO4. Similarly, dental caries and osteoporosis might be considered as in vivo dissolution of CaPO4. In addition, natural CaPO4 are the major source of phosphorus, which is used to produce agricultural fertilizers, detergents and various phosphorus-containing chemicals. Thus, there is a great significance of CaPO4 for the humankind and, in this paper, an overview on the current knowledge on this subject is provided.
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Horiuchi N, Endo J, Wada N, Nozaki K, Nakamura M, Nagai A, Katayama K, Yamashita K. Dielectric properties of fluorine substituted hydroxyapatite: the effect of the substitution on configuration of hydroxide ion chains. J Mater Chem B 2015; 3:6790-6797. [DOI: 10.1039/c5tb00944h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dielectric properties of fluoridated hydroxyapatite (F-HAp; Ca5(PO4)3(OH)1−xFx) were measured. The results show that the F-substitution induces the specific configuration that contains hydrogen bonds in F-HAp.
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Affiliation(s)
- N. Horiuchi
- Department of Inorganic Materials
- Institute of Biomaterials & Bioengineering
- Tokyo Medical and Dental University
- Tokyo 101-0062
- Japan
| | - J. Endo
- Department of Applied Chemistry
- Tokai University
- Hiratsuka
- Japan
| | - N. Wada
- Department of Inorganic Materials
- Institute of Biomaterials & Bioengineering
- Tokyo Medical and Dental University
- Tokyo 101-0062
- Japan
| | - K. Nozaki
- Department of Inorganic Materials
- Institute of Biomaterials & Bioengineering
- Tokyo Medical and Dental University
- Tokyo 101-0062
- Japan
| | - M. Nakamura
- Department of Inorganic Materials
- Institute of Biomaterials & Bioengineering
- Tokyo Medical and Dental University
- Tokyo 101-0062
- Japan
| | - A. Nagai
- Department of Inorganic Materials
- Institute of Biomaterials & Bioengineering
- Tokyo Medical and Dental University
- Tokyo 101-0062
- Japan
| | - K. Katayama
- Department of Applied Chemistry
- Tokai University
- Hiratsuka
- Japan
| | - K. Yamashita
- Department of Inorganic Materials
- Institute of Biomaterials & Bioengineering
- Tokyo Medical and Dental University
- Tokyo 101-0062
- Japan
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21
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Kumar PN, Kannan S. Quantitative analysis of the structural stability and degradation ability of hydroxyapatite and zirconia composites synthesized in situ. RSC Adv 2014. [DOI: 10.1039/c4ra02441a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Gomes S, Kaur A, Nedelec JM, Renaudin G. X-ray absorption spectroscopy shining (synchrotron) light onto the insertion of Zn2+in calcium phosphate ceramics and its influence on their behaviour under biological conditions. J Mater Chem B 2014; 2:536-545. [DOI: 10.1039/c3tb21397h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Sprio S, Guicciardi S, Dapporto M, Melandri C, Tampieri A. Synthesis and mechanical behavior of β-tricalcium phosphate/titania composites addressed to regeneration of long bone segments. J Mech Behav Biomed Mater 2013; 17:1-10. [DOI: 10.1016/j.jmbbm.2012.07.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 07/17/2012] [Accepted: 07/22/2012] [Indexed: 11/15/2022]
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24
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Shepherd JH, Shepherd DV, Best SM. Substituted hydroxyapatites for bone repair. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2335-2347. [PMID: 22389101 DOI: 10.1007/s10856-012-4598-2] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 02/17/2012] [Indexed: 05/31/2023]
Abstract
Calcium phosphates such as hydroxyapatite have a wide range of applications both in bone grafts and for the coating of metallic implants, largely as a result of their chemical similarity to the mineral component of bone. However, to more accurately mirror the chemistry, various substitutions, both cationic (substituting for the calcium) and anionic (substituting for the phosphate or hydroxyl groups) have been produced. Significant research has been carried out in the field of substituted apatites and this paper aims to summarise some of the key effect of substitutions including magnesium, zinc, strontium, silicon and carbonate on physical and biological characteristics. Even small substitutions have been shown to have very significant effects on thermal stability, solubility, osteoclastic and osteoblastic response in vitro and degradation and bone regeneration in vivo.
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Affiliation(s)
- Jennifer H Shepherd
- Department of Materials Science and Metallurgy, University of Cambridge, New Museum's Site, Pembroke Street, Cambridge CB2 3QZ, UK.
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Low HR, Avdeev M, Ramesh K, White TJ. Zinc hydroxyapatite catalyst for decomposition of 2-propanol. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:4175-4179. [PMID: 22714569 DOI: 10.1002/adma.201104755] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 02/22/2012] [Indexed: 06/01/2023]
Affiliation(s)
- Hou Ran Low
- School of Materials Science and Engineering, Nanyang Technological University, Singapore.
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Reconstructions of electron density by the Maximum Entropy Method from X-ray powder diffraction data based on incomplete and complete crystal structure models: a case study of apatites with different intercalated metal atoms. Z KRIST-CRYST MATER 2012. [DOI: 10.1524/zkri.2012.1533] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Enax J, Prymak O, Raabe D, Epple M. Structure, composition, and mechanical properties of shark teeth. J Struct Biol 2012; 178:290-9. [PMID: 22503701 DOI: 10.1016/j.jsb.2012.03.012] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/18/2012] [Accepted: 03/21/2012] [Indexed: 11/17/2022]
Abstract
The teeth of two different shark species (Isurus oxyrinchus and Galeocerdo cuvier) and a geological fluoroapatite single crystal were structurally and chemically characterized. In contrast to dentin, enameloid showed sharp diffraction peaks which indicated a high crystallinity of the enameloid. The lattice parameters of enameloid were close to those of the geological fluoroapatite single crystal. The inorganic part of shark teeth consisted of fluoroapatite with a fluoride content in the enameloid of 3.1 wt.%, i.e., close to the fluoride content of the geological fluoroapatite single crystal (3.64 wt.%). Scanning electron micrographs showed that the crystals in enameloid were highly ordered with a special topological orientation (perpendicular towards the outside surface and parallel towards the center). By thermogravimetry, water, organic matrix, and biomineral in dentin and enameloid of both shark species were determined. Dentin had a higher content of water, organic matrix, and carbonate than enameloid but contained less fluoride. Nanoindentation and Vicker's microhardness tests showed that the enameloid of the shark teeth was approximately six times harder than the dentin. The hardness of shark teeth and human teeth was comparable, both for dentin and enamel/enameloid. In contrast, the geological fluoroapatite single crystal was much harder than both kinds of teeth due to the absence of an organic matrix. In summary, the different biological functions of the shark teeth ("tearing" for Isurus and "cutting" for Galeocerdo) are controlled by the different geometry and not by the chemical or crystallographic composition.
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Affiliation(s)
- Joachim Enax
- Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany
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Gomes S, Nedelec JM, Renaudin G. On the effect of temperature on the insertion of zinc into hydroxyapatite. Acta Biomater 2012; 8:1180-9. [PMID: 22186160 DOI: 10.1016/j.actbio.2011.12.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Revised: 12/03/2011] [Accepted: 12/05/2011] [Indexed: 10/14/2022]
Abstract
Rietveld analysis of X-ray powder diffraction patterns recorded from 28 hydroxyapatite (HAp) samples containing various amounts of zinc (0, 1.6, 3.2 and 6.1wt.% Zn) and heat treated at various temperatures (between 500°C and 1100°C) has enabled the Zn insertion mechanism into the HAp crystal structure to be finely characterized. The formation of Zn-doped HAp was achieved above 900°C only. Zn-doped HAp has the Ca(10)Zn(x)(PO(4))(6)(OH)(2-2)(x)O(2)(x) (0<x⩽0.25) chemical composition with a constant Ca/P ratio of 1.67 due to the insertion mechanism into the hexagonal channel (partial occupancy of the 2b Wyckoff site with the formation of linear O-Zn-O entities). Samples heat treated at 500°C were almost single phase, HAp did not incorporate Zn and about half of the Zn atoms incorporated during the synthesis are not observable by X-ray powder diffraction (contained in an amorphous compound or physisorbed at the HAp surface). The reversible formation of Zn-doped β-TCP phase was observed at 600°C, reached its maximum content at 900°C and had almost vanished at 1100°C. The results presented here strengthen the recently described mechanism of Zn insertion in the interstitial 2b Wyckoff position of the HAp structure, and explain the origin of the contradictory reports in the corresponding literature.
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Gomes S, Renaudin G, Mesbah A, Jallot E, Bonhomme C, Babonneau F, Nedelec JM. Thorough analysis of silicon substitution in biphasic calcium phosphate bioceramics: a multi-technique study. Acta Biomater 2010; 6:3264-74. [PMID: 20188871 DOI: 10.1016/j.actbio.2010.02.034] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Revised: 02/16/2010] [Accepted: 02/19/2010] [Indexed: 10/19/2022]
Abstract
Four samples of composition Ca(10)(PO(4))(6-x)(SiO(4))(x)(OH)(2-x), with x=0.0, 0.1, 0.2 and 0.5, were prepared and characterized using powder X-ray and neutron powder diffraction, and (1)H, (31)P and (29)Si nuclear magnetic resonance (NMR) spectroscopy. The composition of the Si-substituted HAp phases was determined by joint Rietveld refinements from powder X-ray and powder neutron diffraction data. Taking into account electroneutrality, a chemical formula for the Si-substituted HAp phases with indication of the incorporated silicate amount is proposed. Solid-state (29)Si NMR confirms the presence of only Q(0) species, in good agreement with the presence of substituted HAp and beta-TCP phases only. Thanks to NMR spectroscopy, two types of protons in the Si-substituted HAp phase were identified, the new site corresponding to species engaged in hydrogen bonding with silicate anions. This allowed further refinement of the formulae for these phases with very good quantitative agreement for populations derived from the refinement and integration of NMR data.
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Veselinović L, Karanović L, Stojanović Z, Bračko I, Marković S, Ignjatović N, Uskoković D. Crystal structure of cobalt-substituted calcium hydroxyapatite nanopowders prepared by hydrothermal processing. J Appl Crystallogr 2010. [DOI: 10.1107/s0021889809051395] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A series of cobalt-exchanged hydroxyapatite (CoHAp) powders with different Ca/Co ratios and nominal unit-cell contents Ca10−xCox(PO4)6(OH)2,x= 0, 0.5, 1.0, 1.5 and 2.0, were synthesized by hydrothermal treatment of a precipitate at 473 K for 8 h. Based on ICP (inductively coupled plasma) emission spectroscopy analysis, it was established that the maximum amount of cobalt incorporation saturated at ∼12 at.% under these conditions. The effects of cobalt content on the CoHAp powders were investigated using ICP emission spectroscopy, particle size analysis, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) analyses as well as X-ray powder diffraction (XRPD) including Rietveld analysis. According to XRPD, all the materials are single-phase HAp and CoHAp of low crystallinity. Rietveld analysis shows that Co enrichment causes theccell parameter to decrease at a faster rate than theacell parameter. A microstructural analysis showed anisotropic X-ray line broadening due to crystallite size reduction. In CoHAp there is significant crystal elongation in [001], and the average size decreases with increasing cobalt content. The crystallite morphology transforms from rod-like for the pure HAp to lamellae at the highest degree of Co substitution. The results of Rietveld refinement (symmetry, size and morphology of the crystallites) were confirmed by TEM and HRTEM analysis.
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Low HR, Ritter C, White TJ. Crystal structure refinements of the 2H and 2M pseudomorphs of ferric carbonate-hydroxyapatite. Dalton Trans 2010; 39:6488-95. [DOI: 10.1039/c001612h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gomes S, Renaudin G, Jallot E, Nedelec JM. Structural characterization and biological fluid interaction of Sol-Gel-derived Mg-substituted biphasic calcium phosphate ceramics. ACS APPLIED MATERIALS & INTERFACES 2009; 1:505-513. [PMID: 20353243 DOI: 10.1021/am800162a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Sol-Gel chemistry has been used to prepare undoped and Mg-substituted biphasic calcium phosphate (BCP) ceramics composed of hydroxyapatite (HAp) and whitlockite (beta-TCP) phases. Different series of samples have been synthesized with different Mg-doping levels (from 0 to 5 atomic % of Ca atoms substituted) and different temperatures of calcination (from 500 to 1100 degrees C). All of the powdered samples were systematically treated by Rietveld refinement to extract the quantitative phase analysis and the structural and microstructural parameters, to locate the Mg crystallographic sites, and to refine the composition of the Mg-substituted phases. The temperature dependence of the weight amount ratio between HAp and beta-TCP is not monotonic because of the formation of minor phases such as Ca(2)P(2)O(7), CaO, MgO, and CaCO(3) and certainly an amorphous phase. On the other hand, the Mg stabilizing feature on the beta-TCP phase has been evidenced and explained. The mechanism of stabilization by small Mg(2+) is different from that by large Sr(2+). Nevertheless, in both cases, the beta-TCP stabilization is realized by an improvement of the environment of the Ca4 site unusually face-coordinated to a PO(4) tetrahedron. The substitution of a Mg atom in the Ca5 site allows considerable improvement of the bond valence sum of the unusual Ca4 polyhedron. The temperatures of calcination combined with the amount of Mg atoms introduced allow monitoring of the phase composition of the BCP ceramics as well as their microstructural properties. The bioactivity properties of the BCP samples are improved by the presence of Mg atoms in the structure of the beta-TCP phase. The mechanism of improvement is mainly attributed to an accelerated kinetic of precipitation of a calcium phosphate layer at the surface comprising HAp and/or beta-TCP phases.
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Affiliation(s)
- S Gomes
- Laboratoire des Matériaux Inorganiques, CNRS UMR 6002, Universite Blaise Pascal & Ecole Nationale Supérieure de Chimie de Clermont-Ferrand, Clermont Université, 24 avenue des Landais, Aubière Cedex, France
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Low HR, Phonthammachai N, Maignan A, Stewart GA, Bastow TJ, Ma LL, White TJ. The Crystal Chemistry of Ferric Oxyhydroxyapatite. Inorg Chem 2008; 47:11774-82. [DOI: 10.1021/ic801491t] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. R. Low
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
| | - N. Phonthammachai
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
| | - A. Maignan
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
| | - G. A. Stewart
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
| | - T. J. Bastow
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
| | - L. L. Ma
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
| | - T. J. White
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Laboratoire CRISMAT, UMR CNRS 6508, ENSICAEN, 6 Bd du Marechal Juin, 14050 Caen, Cedex, France, School of Physical, Environmental and Mathematical Sciences, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia, and CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia
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Renaudin G, Laquerrière P, Filinchuk Y, Jallot E, Nedelec JM. Structural characterization of sol–gel derived Sr-substituted calcium phosphates with anti-osteoporotic and anti-inflammatory properties. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b804140g] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Synthesis and Eu3+ luminescence in new oxysilicates, ALa3Bi(SiO4)3O and ALa2Bi2(SiO4)3O [ACa, Sr and Ba] with apatite-related structure. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.08.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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37
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Rodríguez-Lorenzo LM. Studies on calcium deficient apatites structure by means of MAS-NMR spectroscopy. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2005; 16:393-8. [PMID: 15875247 DOI: 10.1007/s10856-005-6977-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2004] [Accepted: 11/01/2004] [Indexed: 05/02/2023]
Abstract
The development of synthetic apatites that replicate the features and properties of the contained in natural tissues will help to diminish the misfit between artificial implants and natural hostesses but the structure of these compounds is still under discussion. The variability in Ca/P ratio of calcium deficient apatites has been explained through different models: surface adsorption, lattice substitution and intercrystalline mixtures of hydroxyapatite and octacalcium phosphate. This work investigates which of the models mentioned suits better in a range of samples. Hydroxyapatites obtained by precipitation, by hydrolysis of dicalcium phosphate and calcined samples with Ca/P ratio between 1.50 and 1.77 and specific surface area between 7 and 108 m2/g have been analysed. OCP and surface adsorption models suit better for great SSA particles and low Ca/P ratio while for smaller SSA particles the lattice substitution model is more accurate. SSA also plays the main role when the capacity to absorb substances is studied though their chemistry can not be explained solely in terms of surface reactivity.
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Gross KA, Rodríguez-Lorenzo LM. Sintered hydroxyfluorapatites. Part I: Sintering ability of precipitated solid solution powders. Biomaterials 2004; 25:1375-84. [PMID: 14643612 DOI: 10.1016/s0142-9612(03)00565-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The presence of fluoride within apatites occurring naturally within the body provides the basis for investigating the sintering ability of fluoride containing hydroxyapatites for use as biomaterials. Hydroxyfluorapatites were synthesized and then calcined to produce a 0%, 20%, 40%, 60%, 80% and 100% replacement of the hydroxyl ions with fluoride in the hydroxyapatite structure. Fluoride ion occupancy within the apatites was found to be about 90% of the anticipated value. Pycnometry results revealed a constant true density for powders of low to medium fluoride content followed by a rapid increase to the fluorapatite composition. Powders were uniaxially pressed, cold-isostatically pressed and sintered at 1150 degrees C, 1200 degrees C and 1250 degrees C. All hydroxyfluorapatite powders displayed a comparable ability for densification except when hydroxyl groups and fluoride ions were present at a comparable concentration. The grain size revealed that this composition also exhibited the smallest grain size and displayed the highest activation energy for grain growth. The lower diffusion created by similar amounts of fluoride and hydroxide within the lattice decreases grain growth and densification.
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Affiliation(s)
- Kārlis A Gross
- School of Physics and Materials Engineering, Building 69, Monash University, Victoria 3800, Australia.
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