The spontaneous nucleation of apatite crystals on the surface of Ti/Si and Si substrates was activated by applying positive constant potentials. The surface morphology and microstructure of these films …
1. Introduction. Biological apatite is an inorganic calcium phosphate salt (CaPs) in apatite form with a biological derivation. As the main inorganic component of …
Figure 4f shows the NaCl content of the films. The NaCl concentration is small for all samples, regardless of the ionic strength (Na at% < 2.5% and Cl at% < 2%), which is consistent with the expectations because of the high solubility of NaCl. ... Solutions 3 and 4 showed slower apatite film growth kinetics, but they showed the most adhered ...
Apatite ores are the most important phosphate materials used for the agricultural and livestock chemical production. With the global demand for phosphorous compounds, apatite and other phosphorus-bearing ores are being depleted. The main method of apatite ore enrichment at the moment is the flotation process, the efficiency …
It is important that the fabricated apatite films by the spray process have the characteristic network structures. The materials with these CA films are nontoxic and have the excellent bonding ability to bone tissues. ... Additionally, Siebers et al. assayed the cell proliferation, alkaline phosphatase activity, and osteocalcin concentration of ...
Thick-film (60–100 μm) areas as a result of strong discharge during anodization were also observed by cross-sectional FE-SEM image shown later in Fig. 4 a. EDX maps on the PEO film, presented in Fig. 1 b–d, detected O, P and Mg as the main components of the oxide film with concentrations of 56.98, 13.74, and 19.15 at
Hydroxyapatite (HAp) is a member of the calcium apatite family that has been widely employed as an implant material in bone tissue regeneration (osteogenesis) and as a drug carrier in the drug delivery system. HAp exhibits excellent biocompatibility, high bioactivity, excellent osteoconduction, osteointegration, and osteoinductive …
Introduction. Recent investigations [1, 2] and earlier works [3, 4] have shown that the mineral of cardiovascular pathological deposits consists of poorly crystalline …
The formation of apatite from F--free MCP solutions was limited in a dilute MCP concentration region. At relatively high MCP concentrations brushite …
1. Introduction. Biological apatite is an inorganic calcium phosphate salt (CaPs) in apatite form with a biological derivation. As the main inorganic component of both bones and teeth, it is distributed in the organic constituents with certain sequence and direction [].By serving as the fillers in such biological tissues, biological apatite is critical …
The overall aim of the study is to evaluate the implications for future smelting experiments aimed at concentration and recovery of the REEs. ... "Unlocking Rare Earth Elements from European Apatite-Iron Ores," presented at the 1st European Rare Earth Resources Conference (ERES), Milos (Greece), (2014), 10. Google Scholar
[13][14][15][16] Manso et al. used both AFM and HRTEM to study the structure of thin (<0.3 mm) sodium-and carbonate-containing HAP that was grown from a basic solution (pH 9.1) on Si (100) and Ti ...
Partition coefficient of REE between apatite and groundmass in dacites. Ratios of REG in apatite to whole-rock of'granite are also plotted: the Torihama apatite the Ito apatite (Ito) the Ito apatite (Tsumaya) (~)), the Ata apa- tite and the Takakuma apatite (a). data are only for pluto~nic reeks. not for volcanic rocks.
Phosphate concentrations from 6 h in solution were very low in agreement with previous studies 6,53, and this result has been associated with a rapid phosphorus release before the first time point ...
O concentration in apatite by IR approaches parts per million level for wafers of 0.1 mm thickness. The accuracy based on our calibration is 5–10% relative. Keywords: Apatite, water concentration, IR spectroscopy, ERD analysis introduction Apatite is a common accessory mineral in igneous rocks on
SURFACE AND INTERFACE ANALYSIS Surf. Interface Anal. 2001; 31: 1104–1109 Apatite films produced by electrodeposition: characterization by TEM and AFM Miguel Manso,1∗ Carmen Jiménez,1 Carmen Morant,1 Pilar Herrero2 and J. M. Martı́nez-Duart1 1 Departamento de Fı́sica Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, …
A new substance was found to form on the anatase thin film. The thicknesses of the anatase and apatite layers were approximately 0.9 and 0.7 mm, respectively. Apatite crystals were thin platelets, as shown in Fig. 4. According to the results of weight measurement before and after soaking in PBS, 0.9 g/mm of apatite formed on the …
The SBF used in this study was a modified solution, with a concentration of Ca 2+ and HPO 4 2 ... Apatite films biomimetically nucleated and grown on PLGA substrates consisted of differently oriented carbonated apatite crystals and some ACP. Needle-shaped apatite was single crystalline. The biomimetically formed mineral is an …
It additionally adheres to the demineralized porosities and establishes a constant apatite film [24, 25]. ... The samples were applied with the 20% concentration …
develop an approach for estimating melt concentrations of F and Cl from apatite inclusions contained in zircon, draw-ing upon recent advancements in apatite F–Cl–OH exchange modelling (Li and Hermann 2017; Li and Costa 2020), data from published apatite-melt experiments, and Ti-in-zircon thermometry. We discuss the mechanisms …
Dissolution at Tundulu and Kangankunde occurs in an unusual core-outward manner, and may be due to the lower stability of "original" CO 3-bearing apatite. The REE concentrations of the turbid apatite cores (reactant apatite) are HREE enriched and the clear apatite rims (product apatite) are LREE-enriched, with apatite crystallization ...
Fabrication of Apatite Films on Ti Substrates of Simple and Complicated Shapes by Using Stable Solutions of Ca Complex November 2018 DOI: 10.5772/intechopen.80409
Abstract. Apatite can incorporate significant amounts of H 2 O and CO 2, potentially recording volatile abundance and behavior during magma evolution.Here we conducted in situ measurements of CO 2 and H 2 O concentrations in apatite, along with elemental compositions, from two contemporaneous alkaline volcanic suites (Tianbao …
The retention processes differ depending on the supersaturation of the solution with respect to calcium phosphate phases: at low calcium concentrations (69.8 ± 3.9 mg·L−1), hydroxyapatite ...
Effect of nano-hydroxyapatite concentration on remineralization of initial enamel lesion in v itro (2009) Dr. B's notes: This is an older study out of China which studied four different concentrations of nano-hydroxyapatite (1%, 5%, 10% and 15% by weight).The 10% and 15% demonstrated efficacy, however, this is for a micro particle of …
Bioactive glasses convert to a biomimetic apatite when in contact with physiological solutions; however, the number and type of phases precipitating depends …
Apatite is the name for a group of minerals with the general formula A 5 (TO 4) 3 Z (Gaines et al., 1997, pp. 854–868), in which A represents a range of cations, usually calcium, but may be strontium, lead, barium, uranium, or rare earths; T is usually P, but As and V do form other minerals that crystallize with the same hexagonal or pseudohexagonal crystal …
The macroscopic and nanoscopic morphology of apatite coatings deposited from SBF are influenced by calcium and phosphate concentration, pH, temperature, and the presence of other inorganic and organic molecules.3, 10, 11, 12 The morphology and structure of apatites, in turn, dictate the biomechanical and biochemical properties.2, 3, …
Introduction. Apatite is a widespread accessory mineral found in a range of igneous rocks, metamorphic rocks and sediments. Although nominally Ca 5 (PO 4) 3 (F,OH,Cl), apatites typically contain high concentrations of an extensive range of trace elements, including U, Th, Sr and Rare Earth Elements (REEs) (Belousova et al., 2002; …
2.1.1. Igneous apatite geochemistry. In magmatic rocks apatite is a minor yet ubiquitous accessory phase. Apatite is occasionally a rock forming mineral in some cumulates and rare igneous rock types such as nelsonites and certain pegmatites (Piccoli and Candela, …
Chlorine measurements in apatite have conventionally required electron probe microanalysis (EPMA). Laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) is increasingly used in apatite fission-track dating to determine U concentrations and also in simultaneous U-Pb dating and trace element measurements …
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 …
cium and phosphate concentration, pH, temperature, and the presence of other inorganic and organic mol- ... properties.2,3,5,13–16 However, few ultrastructural-level studies (from 0.1 to 100 nm) on apatite films deposited from SBF have been conducted, and most transmission a)Address all correspondence to this author. e-mail: [email protected] ...
The response of osteoblastic cells to a thin film of poorly crystalline calcium phosphate apatite crystals (PCA) was examined in vitro. The PCA thin film was prepared on polystyrene culture dishes using highly metastable calcium phosphate ion solution at low temperatures. The PCA thin film was formed through fusion and …
Details of apatite formation and development in bone below the nanometer scale remain enigmatic. Regulation of mineralization was shown to be governed by the activity of non-collagenous proteins ...