| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schoenstein, Frédéric
Université Sorbonne Paris Nord
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023Microstructure effects on thermal and electrical conductivities in the intermetallic compound Ag$$_{3}$$Sn-based materials, sintered by SPS in view of die-attachment applicationscitations
- 2023Grain-size effect on Cr3+ and F-centres photoluminescence in nanophase MgAl2O4 ceramicscitations
- 2023Grain-size effect on Cr$^{3+}$ and F-centres photoluminescence in nanophase MgAl$_2$O$_4$ ceramicscitations
- 2022Spark Plasma Sintering of Nanostructured TiCrC Carbides Prepared via Mechanical Alloyingcitations
- 2022The Polyol Process and the Synthesis of ζ Intermetallic Compound Ag5Sn0.9citations
- 2020From Ni–P Metastable Alloy Nanoparticles to Bulk Submicrometer Grain-Sized MMCs with Tunable Mechanical and Magnetic Propertiescitations
- 2020Spin Coating and Micro-Patterning Optimization of Composite Thin Films Based on PVDFcitations
- 2020Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Fieldcitations
- 2019Morphology and luminescence of MgAl2O4 ceramics obtained via spark plasma sinteringcitations
- 2018Composite microstructures and piezoelectric properties in tantalum substituted lead-free K 0.5 Na 0.5 Nb 1-x Ta x O 3 ceramicscitations
- 2017Substitution effect of Me = Al, Bi, Cr and Mn to the microwave properties of polyaniline/BaMeFe 11 O 19 for absorbing electromagnetic wavescitations
- 2017Spark plasma sintering (SPS) of pure and doped alumina ceramics
- 2017Effect of stacking faults on the magnetocrystalline anisotropy of hcp Co-based nanowirescitations
- 2015Synthesis, microstructure and electromechanical properties of undoped (K0·5Na0·5)NbO3citations
- 2014Nanocrystalline Hydroxyapatite Ceramics Prepared by Hydrolysis in Polyol Medium, Microstructure and Mechanical Properties after Spark Plasma Sintering.citations
- 2014Spark Plasma Sintering constrained process parameters of sintered silver paste for connection in power electronic modules: Microstructure, mechanical and thermal propertiescitations
- 2014The effect of pH and the process of direct or inverse synthesis of silicon-Substituted hydroxyapatite prepared by hydrolysis in aqueous medium.citations
- 2014Piezoelectric performances of undoped (K,Na)NbO3 ceramics and crystals for transducers applications. citations
- 2014Effect of spark plasma sintering process on the microstructure and mechanical properties of Nano crystalline hydroxyapatite ceramics prepared by hydrolysis in polyol mediumcitations
- 2014Effect of spark plasma sintering process on the microstructure and mechanical properties of Nano crystalline hydroxyapatite ceramics prepared by hydrolysis in polyol mediumcitations
- 2014Electromechanical Properties and Microstructure of Undoped K0.5Na0.5NbO3 Ceramics and KNbO3-NaNbO3 Crystalscitations
- 2014High electromechanical performance with spark plasma sintering of undoped K0.5Na0.5NbO3 ceramicscitations
- 2013Synthesis and functional properties of piezoelectric lead free K0.5Na0.5NbO3 ceramics and single crystals.
- 2007CoFe2O4 NANOSTRUCTURED MAGNETIC MATERIALS : INFLUENCE OF NOT-CONVENTIONAL METHODS OF COMPACTION (SPS, HIP) ON THE MICROSTRUCTURE AND PHYSICAL CHARACTERISTICS.
Places of action
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article
The effect of pH and the process of direct or inverse synthesis of silicon-Substituted hydroxyapatite prepared by hydrolysis in aqueous medium.
Abstract
Nanosized hydroxyapatite with silicon substitution Ca10(PO4)6−x(SiO4)x(OH)2−x□x (0 ≤ x ≤ 2) of same silicon concentrations, variation of pH and the method of inverse and direct synthesis were successfully prepared first time by the theoretical maximum of incorporation of Si into the hexagonal apatite structure by precipitation method aqueous. The effects of the Si substitution on crystallite size, particle size and morphology of the powders were investigated. The crystalline phase, microstructure, morphology and particle size of hydroxyapatite and silicon substituted hydroxyapatites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), EDX coupled with SEM and transmission electron microscopy (TEM). The samples were successfully synthesized as a single-phase apatite, and crystallization of apatite was enhanced during heating. The results obtained in this study show that the kinetics between different direct and inverse process showed different reactivities, in the presence of varying pH. Compared with the two methods, the inverse method have higher kinetic in the formation of hydroxyapatite silicate because of the difference in lattice parameters. The grain size of Si-HA samples is clearly finer than that of pure HA sample and this decreases with increasing Si content. The growth of HA nanorods with temperature can be described by ―oriented attachment‖. According to this theory the adjacent HA crystallites would coalesce in one particular direction on the (1 1 0) high energy planes, creating templates to form elongated rod-like structure. Fourier Transform Infrared Spectroscopy analysis reveals, the silicon incorporation to hydroxyapatite lattice occurs via substitution of silicate groups for phosphate groups. Substitution of phosphate group by silicate in the apatite structure results in a increase in the lattice parameters in both a-axis and c-axis of the unit cell.