TITANIUM DIOXIDE AND APATITE COATED FIBROUS …
Figure 1 shows the thin-film X-ray diffraction patterns of the surface of the TiO2 coated fibrous ceramics after immersion in PBS for 1 day. The peaks indicate that the specimen has an anatase and an apatite. The broad diffraction peak of the apatite is thought that the apatite crystal is of a defective structure.
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Thin film of low-crystalline calcium phosphate apatite formed …
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.
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apatite
calibration or standards are needed to determine absolute hydrogen concentration using the ERD method (Tirira 1991; Aubaud et al. 2009; Bureau et al. 2009). Apatite wafers were polished with SiC sandpaper and 0.3 µm alumina powder on cloth. The Cerro sample was coated with a Ni film a few nanometers thick to prevent charge build up
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Bioinspired and osteopromotive polydopamine nanoparticle …
Hybrid membranes with optimized PDA NP content exhibit high quantities of apatite deposition and prominent cytocompatibility (cell attachment, spreading and reproduction) and osteo-differentiation ...
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Improvement of hydroxyapatite formation ability of …
The adhesion strength of the hydroxyapatite film formed in the above SBF test showed larger value as increasing the surface roughness of the specimens by adjusting the above acid etching condition depending on the kinds of Ti-based alloys. This is because the adhesion of the hydroxyapatite film occurred by the mechanical interlocking effect.
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Plasma Electrolytic Oxidation (PEO) Process—Processing, …
Here the surface structure and chemical composition of the surface oxide film can be modified by tuning the parameters such as electrolyte concentration and composition, electrical parameters, and substrate composition. ... The coating was used to further study the tendency of biomimetic apatite formation in simulated body fluid (SBF). …
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Development of Hydroxyapatite Coatings for …
PMCID: PMC10535049. PMID: 37764606. Development of Hydroxyapatite Coatings for Orthopaedic Implants from Colloidal Solutions: Part 1—Effect of Solution Concentration …
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Apatite | Phosphate, Calcium & Fluoride | Britannica
apatite, any member of a series of phosphate minerals, the world's major source of phosphorus, found as variously coloured glassy crystals, masses, or nodules. If not for its softness (Mohs hardness 5, compared with the 7 …
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Preparation and characterization of biomimetically and
Surface properties and corrosion resistance analyses of Ti–13Nb–13Zr coated by an oxide film (obtained by micro-arc oxidation at 300 V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their properties compared. …
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Exploration of fluorapatite bio-ceramic thin film deposition …
Another point to be addressed is the effect of solution concentration on the nature of the deposited films. The lower solution concentration (as in sample S8) led to the deposition of film and particles (Fig. S3 in the Online Resource 1) according to the fourth deposition mode. ... Prior studies have shown that rough apatite films have improved ...
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Apatite
Example of the calcium and phosphate ion concentration in a suspension of apatite cement containing tetracalcium phosphate and dicalcium phosphate anhydrous. ... there is incorporation of hydroxyls and carbonate from solution and crystallization of the CaO–P 2 O 5 film to HCA. Glass chemical composition is the variable that has the strongest ...
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(PDF) Influence of preferred orientation on the bioactivity …
After 21 days of immersion, calcium and phosphate mineral concentrations in SBF decreased by 66% and 83%, respectively. ... this apatite film hermetically seals . the tooth margin and thereafter, ...
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Electrodeposition of hydroxyapatite coatings in basic …
Hydroxyapatite films have been grown in this work by an electrodeposition method involving both physical and chemical processes and presenting several differences with respect to other reported works. Description of the coating formation is based on the evolution of current through the sample placed as positive electrode in the basic electrolyte.
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Apatite Flotation from Brazilite–Apatite–Magnetite Ore
Quanta 3D FEI Company). Slime films could be seen on the minerals. On the surface of apatite grain there were microinclusions, films and veins of alumosilicates and carbonates. According to the elemental composition analysis, areas 1–3 of apatite grain contained from 13.6 to 19.3% of СО2, from 1.9 to 4.6% of SiO2, area 1–0.34% of Al2O3 ...
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Effect of pulse current on structure and adhesion of …
Apatite films were deposited onto titanium (Ti) metal substrates by an electrodeposition method under a pulse current. Metastable calcium phosphate solution was used as the electrolyte. The ion concentration of the solution was 1.5 times that of human body fluid, but the solution did not contain magnesium ions at 36.5 °C.We
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Applied Sciences | Free Full-Text | Investigation on the
It must be noted that the formation of the tunnel wall (about 8 μm thick) shown in Figure 3d has similar characteristics to the apatite film (about 500 nm) observed under TEM . The results show that the concentration of calcium ions has a great influence on the type and thickness of apatite nanocrystal coating.
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Impartation of hydroxyapatite formation ability to ultra‐high …
After the EPD process, the substrate was washed with ethanol and air‐dried. The surfaces of the substrates were analysed by thin‐film XRD (Rint 2500, Rigaku, Tokyo, Japan) and SEM (ESEM‐2700, Nikon, Osaka, Japan). The thin film XRD measurements were carried out using Cu‐Kα radiation at 50 kV, 300 mA of tube voltage and current.
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apatite
concentration in apatite (typically expressed as H 2O wt% or ppm) has been estimated by combining electron microprobe analyses of F and Cl with knowledge of mineral stoichiometry (e.g., Mathez and Webster 2005; McCubbin and Nekvasil 2008). However, the X-ray intensity for the F Kα peaks when analyzing apatite varies as a function of electron ...
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Apatite
As can be seen, concentration of PO 4 3 − ion decreased significantly whereas Ca 2+ ion concentration showed the relatively stable value. In the case of cements with more than …
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Fluor-hydroxyapatite sol–gel coating on titanium substrate …
Hydroxyapatite (HA) and fluor-hydroxyapatite (FHA) films were deposited on a titanium substrate using a sol–gel technique. Different concentrations of F − were incorporated into the apatite structure during the sol preparation. Typical apatite structures were obtained for all coatings after dipping and subsequent heat treatment at 500°C.
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(PDF) Fabrication of Apatite Films on Ti Substrates of Simple …
The crystallite size, orientation factor and O/Ti ratio of rutile crystals in the R thin film and in the post-annealed R-PAn thin films [8]. The crystallite size of rutile was measured with a ...
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Effect of dehydration on structure and induction capability for apatite
The apatite-forming ability of the MAO film was improved greatly after chemical etching; however, that of the etched MAO film decreases after dehydration. The reason for this is that dehydrated Ca–Ti–O compounds on the surfaces of the etched and heat-treated MAO films are unfavorable for Ca ions release compared with the hydrous …
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Impartation of hydroxyapatite formation ability to …
1 Introduction. In the early 1970s, Hench invented the glass materials named Bioglass® as the world's first materials with the spontaneous bone-bonding ability [].Since this Hench's work, various types of bioactive ceramics bonded to living bone spontaneously without the use of cement such as sintered hydroxyapatite (HAp) [], glass-ceramic A/W [], …
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Nano-Hydroxyapatite Gel and Its Effects on Remineralization …
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].
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Calibration for IR measurements of OH in apatite
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: ... The Cerro sample was coated with a Ni film a few nanometers thick to prevent charge build up during ion beam analysis because it was observed to spark
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Hydroxyapatite: A Versatile Bioceramic for Tissue …
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 …
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Continuous Crystalline Carbonate Apatite Thin …
We have demonstrated a novel biomimetic strategy for synthesizing continuous macroscopic-scale films of both amor- phous carbonated calcium phosphate and crystalline carbonate apatite. The thin films of amorphous carbonated calcium phosphate …
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Fluor-Hydroxyapatite Sol–Gel Coating on Ti Substrate
Abstract. Hydroxyapatite (HA) and fluor-hydroxyapatite (FHA) films were deposited on a titanium substrate using a sol-gel technique. Different concentrations of F- were incorporated into the ...
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The effect of surface silanol groups on the deposition of apatite …
As such, the two materials are kept together by a number of hydrogen-bonding interactions between the silanol hydrogen atoms and oxygen ions in the apatite films (OH–O apatite distances between 1.92 and 2.28 Å, depending on the rotation of the apatite film), but without any interactions between surface Si and O atoms to apatite O …
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Apatite nanosheets inhibit initial smooth muscle cell …
The mineral phase would be degraded in endosomes/lysosomes to increase the concentration of intracellular calcium, which may initiate the cell death [32]. However, the interaction between docked nanostructured CaP and SMCs has not yet been studied to the same extent. ... Further, apatite thin film with plain structure, extract medium and …
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