The pulsed laser deposition of calcium phosphate (apatite) thin films using targets with different optical absorptivities has been studied. It was found that the surface …
Therefore, such n-type oxides can show an insulator-to-metal transition at a few ppm ( 10 16 − 10 18 cm − 3 ) of oxygen vacancies and further enhanced conductivity at increased vacancy concentrations, such as that observed in the prototype oxide SrTiO 3. 7,44,45 On the other hand, p-type oxides typically show a metal-to-insulator ...
La spectrométrie de masse à source plasma couplée à l'ablation laser (LA-ICP-MS) est de plus en plus utilisé dans la datation sur traces de fission de l'apatite pour déterminer les concentrations en U et aussi pour la datation simultanées U-Pb et les mesures des éléments traces de l'apatite. Les mesures du Cl dans l'apatite par ICP-MS ...
Bioengineering. K. Ishikawa, ... K. Kawate, in Comprehensive Structural Integrity, 2003 9.05.6.3 Carbonate Apatite. Biological apatite —constituent of both tooth and bone—contains ∼3–5 wt.% of carbonate ion in its lattice sites for phosphate and hydroxyl ions (Elliot, 1994).Substitutions of carbonate ion for OH site and PO 4 site are defined as …
It additionally adheres to the demineralized porosities and establishes a constant apatite film [24, 25]. Moreover, nano-HA showed an extreme affinity to enamel and was considered to be one of the potent biologically compatible and bioactive materials that accomplished wide-ranging interests in dental medicine over the years [26, 27].
3. The geochemical behavior of gold in hydrothermal systems. The occurrence of gold mainly depends on temperature, pressure, pH values, Cl − concentration, and fugacity of H 2 S in a hydrothermal system. Gold mostly occurs as AuCl − 2 in a system with temperature higher than 400 °C (Gammons and Williams-Jones, 1997), and with …
Introduction. Hydroxyapatite (Ca 10 (PO 4) 6 (OH) 2, HAP) is a material mainly known for its special ability to contact bone tissue.In fact, HAP is part of the inorganic constituent of natural bone. Although the mechanical properties of bulk HAP only allow applications for small non-loaded structures [1], the possibility of depositing it into films …
Specifically, in the presence of 2 M NaCl, the stability of the films formed from the frother/PAX solutions significantly declined at higher frother concentrations, probably due to the generation ...
Apatite layer formation on all three polymers seemed to strongly depend on the concentration of the NaOH solution utilized (Fig. 1).On PEEK, pre-treated with different concentrations of NaOH and immersed in 1.5 SBF for up to 15 days, an apatite layer was first formed on the surface of the films on day 3 when the film was pre-treated with 10 M …
The synthesis of apatite silicated Ca10(PO4)6-x(SiO4)x(OH)2-x (SiHA) with 0≤x≤2 was investigated using a wet precipitation method followed by heat treatment using calcium carbonate CaCO3 and ...
Bone apatite-like films were deposited directly from deproteinized bone targets, without any grinding or calcination. Deposition was performed at room temperature and ha lf of the samples were
Concentration of phosphate was determined by a colorimetric method [27]. 2.3. Culture of cellsL929 fibroblasts (ATCC NCTC clone 929) and MC3T3 osteoblasts were cultured on thin films of apatite formed on various substrates such as culture plates (Corning, USA), without any other treatment of the surfaces.
gel d'apatite est caractérisé par une surface spécifique de 54 m 2 /g et une porosité de 82 % (ZAKARIA, 2012) . Pour M1 et M2 le gel est séché en étuve à 60 °C pendant une
Naturally-occurring phosphate apatite, which is formed geologically and in biomineralization processes, has extensive potential applications and is there ... nanoparticles (NPs) on conductive polypyrrole(PPy)-coated wool yarns. The titanium concentration in the reaction solution was varied between 8–50 mol% with respect to …
The microstructures of the composite films were characterized by Fourier transform infrared spectroscopy (FT-IR), and the effects of cinnamaldehyde concentrations on the thickness, transmittance ...
concentration in apatite (typically expressed as H 2 O wt% or ppm) has been estimated by combining electron microprobe analyses of F and Cl with knowledge of mineral …
Hydroxyapatite (HAP) belongs to the family of Ca apatite. Its natural composition and structure are similar to the inorganic phase of natural bone and teeth and has a wide range of applications in ...
At low concentrations, there is a decrease in the zeta potential values referring to chemisorption, but between oleate concentration 1 × 10 −5 and 1 × 10 −4 M, the potential remains constant. As the concentration increased, the negative value of zeta potential dramatically increased and reached a minimum potential of − 50 mV, which was ...
crystalline apatite particle layer on the surfaces of grooves in metallic titanium samples that are soaked in a simulated body fluid (SBF; Kokubo solution [16]) by applying thermal oxidation treatment at 500°C. The induction of apatite formation on the titanium oxide layer was confirmed using sub-millimeter spa-tial gaps instead of grooves [13 ...
1. Introduction. Calcium hydroxyapatite ("apatite"; Ca 5 (PO 4) 3 OH) is a naturally occurring mineral, whose carbonate-substituted form constitutes the inorganic part of mammalian bone and tooth [].Such a biomimetic hydroxy-carbonate apatite (HCA) phase forms also at the surface of a silicate-based bioactive glass (BG) on its exposure to body …
In addition, Kim et al. [16, 17] reported the production of poorly crystalline apatite thin film formed at low temperatures with similar crystallographic properties to that of natural bone. It ...
Les concentrations en chlore ont été déterminées par LA-ICP-MS (1140 analyses au total) pour dix-neuf occurrences d'apatite, et il y a une complète base de …
The apatite deposition on the raw silk fiber cloth was accelerated when the fibers were subjected to treatment with CaCl (2) solution at a concentration of at least 1 kmol/m (3) before immersion in 1.5SBF. Apatite deposition also was observed on the sericin film after the film was soaked in 1.5SBF for 7 days. These results indicate that apatite ...
This chapter focuses on the fabrication of apatite film on Ti substrate by chemical process used in the metal complexes. We …
Biological apatite in natural bone does not appear in the form of pure Hap, and it contains a considerable amount of carbonate ions [] (about 7.4 mass% with respect to total bone and 11.4 mass% with respect to the inorganic component in natural bone []).Carbonate apatite (CO 3 –Ap), which replaces and/or OH-ions with ions, is similar to …
content of Durango apatite range between 0.03and 0.09 wt.% (Baumer et al. 1985; Wang et al. 2011; Young et al. 1969) so the low end-member concentration of 0.03 wt.% was assigned to the Durango apatite reference material to pro-vide a worst-case scenario H 2O background. The resulting backgrounds calculated in this way were variable, ranging
This study assesses the possibility of routine LA- ICP-MS measurements of chlorine in apatite, an anion which is difficult to analyse by ICP-MS due to its high first ionisation …
1. Introduction [2] Apatite is a common U-bearing accessory mineral in magmatic, sedimentary, and metamorphic rocks, with a U-Pb closure temperature of 450–550°C [Cherniak et al., 1991] making U-Pb dating of apatite a potential widely applicable medium-temperature thermochronometer and a complement to the similar …
In this report, we describe the synthesis and characterization of a highly crystalline dahllite thin film assembled via a biomimetic pathway. A free-standing continuous precursor film …
thin films of carbonated apatite (dahllite). In this report, we describe the synthesis and characterization of a highly crystalline dahllite thin film assembled via a biomimetic pathway. A free-standing continuous precursor film of carbonated calcium phosphate in an …
A perfect matching between bound oxalate determined from conductivity measurements and the bound calcium (from ISE) was achieved considering a C 2 O 4:Ca ratio in the ion associates, n, of 2 ...
In this regard, the use of constant composition crystal growth (C3G) systems [30, 31], which keeps the pH, ionic strength, temperature, and relative concentrations …
Apatite found in bone and the enamel of teeth that are in the early stages of eruption is reported to be calcium-deficient. Microscopic observation of the cross-section of the specimen as shown in Fig. 2, revealed that an apatite film with a thickness of approximately 0.7 μm has formed on the approximately 0.3 μm thick titanium dioxide …
Fatty acids (a distilled tall oil containing approximately 91% oleic and linoleic acids, 6% rosin acid and 3% unsaponifiables) are used as the collector of iron oxides, the dosage of which is usually in the range of 0.45-0.67 kg/t [4, 5]. Conditioning was reported to be of critical importance for the direct flotation process.
To grow an apatite layer on the ACP precoating, the ACP-precoated specimen was immersed for 24 h in a simulated body fluid with ion concentrations approximately equal to those in human blood plasma. The plasma surface modification was necessary to create an adequate apatite coating and to improve the coating adhesion …
However, there was a high concentration of labile ions in the poorly crystalline apatite crystals in the PCA thin film [22, 23] or a high specific area due to the nanodimensional network in the ...