X-Ray Diffraction Method for the Quantitative Characterization of Calcium Phosphate Coatings

Porous calcium phosphate coatings were formed by the micro-arc oxidation method on the surface of titanium for the loading and controlled release of the anticancer drug doxorubicin. The coatings’ morphology and microstructure were examined by scanning electron microscopy. The phase composition was determined with the help of X-ray diffraction analysis. Studies of the hydrophilic properties of the coatings and their zeta potential were carried out. Data on the kinetics of doxorubicin adsorption-desorption were obtained. In addition, the effect of calcium phosphate coatings impregnated with doxorubicin on the viability of the Neuro-2a cell line was revealed. The coating formed at low voltages of 200–250 V contained a greater number of branched communicating pores, and therefore they were able to adsorb a greater amount of doxorubicin. The surface charge also contributes to the process of the adsorption-desorption of doxorubicin, but this effect is not fully understood and further studies are required to identify it.

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Effect of Substrate Temperature on Properties of Nano-Scale Functionally Graded Calcium Phosphate Coatings

Manufacturing Science and Engineering, Parts A and B ◽

10.1115/msec2006-21047 ◽

2006 ◽

Author(s):

Travis Blalock ◽

Xiao Bai ◽

Afsaneh Rabiei

Keyword(s):

Electron Microscopy ◽

Calcium Phosphate ◽

Substrate Temperature ◽

Ion Beam ◽

Processing Parameters ◽

Functionally Graded ◽

Cross Sectional ◽

X Ray ◽

Phosphate Coatings ◽

Calcium Phosphate Coatings

The effect of substrate temperature and processing parameters on microstructure and crystallinity of calcium phosphate coatings deposited on heated substrates in an Ion Beam Assisted Deposition (IBAD) system are being studied. The experimental procedures include mechanical testing and film thickness measurements using bonding strength and profilometery. Cross-sectional scanning transmission electron microscopy (STEM) with energy dispersive X-ray spectroscopy (EDX) through the thickness of the film as well as scanning electron microscopy (SEM) with EDX at the top surface of the film was performed to evaluate the microstructure of the film. The coating crystallinity was studied through X-ray diffraction (XRD). The information gained from current analysis on the set temperature coatings will be used to refine the processing techniques of the Functionally Graded Hydroxyapatite (FGHA) coating.

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Synthesis and Characterization of Zinc Doped Hydroxyapatite for Bone Substitute Applications

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.660.942 ◽

2014 ◽

Vol 660 ◽

pp. 942-946

Author(s):

Mohamad Firdaus Abdul Wahid ◽

C.M. Mardziah ◽

Koay Mei Hyie ◽

N.R. Nik Roselina

Keyword(s):

Crystal Size ◽

Diffraction Method ◽

Lattice Parameters ◽

Phase Changes ◽

Precipitation Method ◽

Zinc Ions ◽

Crystal Shape ◽

X Ray Diffraction ◽

X Ray

Hydroxyapatite was prepared by using precipitation method. The substitution of zinc ions in hydroxyapatite structure was studied by several characterization techniques. Several concentration of zinc ions were substituted into hydroxyapatite. Characterization technique such as X-ray diffraction method was used to study the phase changes and the lattice parameters with the addition of zinc. Field emission scanning electron microscopy was used to examine the influence of zinc on the crystal size and the morphology of the as-synthesized powders. Based on X-ray diffraction result, the addition of zinc affects the lattice parameters and phase. The result showed that zinc ions were substituted in the structure. As zinc substitution increased, the lattice parameters a and c decreased. The crystal shape of hydroxyapatite without zinc ions was regular shapes while hydroxyapatite with zinc ions was irregular and also tends to agglomerates with single particle was calculated about 28 - 34 nm .

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Growth and Characterization of Pure and Doped L-Alanine Tartrate Single Crystals

Journal of Materials ◽

10.1155/2013/613092 ◽

2013 ◽

Vol 2013 ◽

pp. 1-5 ◽

Cited By ~ 6

Author(s):

K. Rajesh ◽

B. Milton Boaz ◽

P. Praveen Kumar

Keyword(s):

Single Crystals ◽

Vickers Microhardness ◽

Diffraction Method ◽

Dielectric Studies ◽

X Ray Diffraction ◽

X Ray ◽

Cell Parameters ◽

Ft Ir ◽

Ft Ir Spectroscopy

Single crystals of pure and Lanthanum doped L-Alanine Tartrate were grown by slow evaporation method. The cell parameters were determined using single crystal X-ray diffraction method. To improve the physical properties of the LAT crystal, Lanthanum dopant was added by 2 mol%. ICP studies confirm the presence of Lanthanum in the grown LAT crystal. Transparency range of the crystal was determined using UV-VIS-NIR spectrophotometer. The functional groups of pure and doped LAT crystals were analyzed by FT-IR spectroscopy. Using Vickers microhardness tester, mechanical strength of the material was found. Dielectric studies of pure and doped LAT single crystals were carried out. The doped LAT crystal is found to have efficiency higher than that of pure LAT crystal.

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Study and Characterization of Powders Nanocomposites Calcium Phosphate/Silica-Gel (SiO2n) Obtained from Attrition Milling: For Biomedical Applications

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.396-398.615 ◽

2008 ◽

Vol 396-398 ◽

pp. 615-618

Author(s):

Rodrigo Brandão ◽

Fernando Pupio ◽

Nelson Heriberto A. Camargo ◽

E. Gemelli

Keyword(s):

Calcium Phosphate ◽

Silica Gel ◽

Biomedical Applications ◽

Bone Matrix ◽

Synthesis And Characterization ◽

X Ray Diffraction ◽

X Ray ◽

Attrition Milling ◽

Bone Calcium

The bioceramics nanostructured have made important characteristics in biomedical applications, especially the calcium phosphate ceramics. The aim of this work is synthesis and characterization of calcium phosphate and nanocomposites powders, the method of dissolution of CaO in liquid medium, precipitation and formation of bone calcium phosphate matrix, and nanocomposites by adding the solution of phosphoric acid (H3PO4). The nanocomposites powders were synthesized using as strengthening silica gel nanometer (20nm) at concentrations of 1%, 2%, 3% and 5% by volume and subjected to heat treatment to 900°C for 2 hours, seeking obtained HA (Hydroxyapatite). Later the bone matrix of calcium phosphate and nanocomposites powders were subjected from process attrition milling for 2 hours, by way of comparison. The studies characterizations were conducted through the technique of X-ray diffraction, scanning electron microscopy (SEM) and dilatometric test.

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Characterization Of Microstructure And Selected Properties of SnSbCu Alloy After FSP

10.21203/rs.3.rs-469608/v1 ◽

2021 ◽

Author(s):

Joanna Hrabia-Wiśnios ◽

Beata Leszczyńska-Madej ◽

Marcin Madej ◽

Aleksandra Węglowska

Keyword(s):

Flexural Strength ◽

Diffraction Method ◽

Compression Tests ◽

X Ray Diffraction ◽

Linear Speed ◽

X Ray ◽

Friction Stir ◽

Before And After ◽

Bearing Alloy

Abstract The paper presents the results of research on the microstructure and selected mechanical properties of the SnSbCu bearing alloy after friction stir processing (FSP). The Whorl tool was used for modification; the process was carried out using two rotational speeds of the tool: 280 and 450 RPM and a constant linear speed of 355 mm/min. Microstructure studies were performed employing the techniques of light microscopy and scanning electron microscopy along with analysis of the chemical composition of micro-areas. Additionally, the phase composition was investigated by means of the X-ray diffraction method and statistical analysis of the precipitates present in the investigated alloy. In addition, hardness, flexural strength and uniaxial compression tests were performed before and after FSP modification. It was proved that using FSP to modify the SnSbCu alloy promotes refinement and homogenization of the microstructure, as well as improvement of the flexural strength, whereas no changes in the hardness level were found.

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