Temperature Influence on the Calcium Phosphate Coatings by Chemical Method

2016 ◽  
Vol 720 ◽  
pp. 197-200
Author(s):  
Daniel Navarro da Rocha ◽  
Leila Rosa de Oliveira Cruz ◽  
Dindo Q. Mijares ◽  
Rubens Lincoln Santana Blazutti Marçal ◽  
José Brant de Campos ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Chemical Deposition ◽  
Deposition Method ◽  
Temperature Influence ◽  
X Ray Diffraction ◽  
Phosphate Coatings ◽  
Chemical Deposition Method ◽  
Increasing Temperature ◽  
Calcium Phosphate Coatings ◽  
Titanium Substrates

The increasing interest in the use of brushite and monetite as resorbable calcium phosphate cements or graft materials is related to the fact of these phases being metastable under physiological environment, with higher solubility than hydroxyapatite phase. In this study, X-ray diffraction (XRD) and scanning electron microscopy with field emission gun (FEG-SEM) analyses were performed in order to assess the temperature influence on the production of calcium phosphate coatings by a chemical deposition method. Titanium substrates were successfully coated with brushite and monetite by a chemical deposition method and a brushite-monetite transformation was assessed with the increasing temperature. Brushite deposition was kinetically favored at low temperatures, whereas monetite was the major phase at higher temperatures.

Bioactivity Assessment of Calcium Phosphate Coatings

2016 ◽  
Vol 720 ◽  
pp. 193-196
Author(s):  
Daniel Navarro da Rocha ◽  
Leila Rosa de Oliveira Cruz ◽  
Dindo Q. Mijares ◽  
Rubens Lincoln Santana Blazutti Marçal ◽  
José Brant de Campos ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Titanium Substrate ◽  
Chemical Deposition ◽  
Hydroxyapatite Coating ◽  
Deposition Method ◽  
Phosphate Coatings ◽  
Chemical Deposition Method ◽  
Calcium Phosphate Coatings

Nowadays, bioactive coatings or modifications on titanium surface have been tested in vitro and in vivo. In this study, two types of calcium phosphate coatings were produced by a chemical deposition method and their bioactivity assay in cell culture medium were investigated. The calcium phosphate coatings were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with field emission gun (FEG-SEM) analyses. Titanium substrate was successfully coated with brushite using chemical deposition method and, after a second step of conversion, the hydroxyapatite coating was obtained. The hydroxyapatite coating showed a bioactivity property after 14 days’ incubation in McCoy medium culture.

Characterization of Calcium Phosphate with an Anodic TiO2 Nanotube Layer on Titanium Screw for Biomedical Application

2014 ◽  
Vol 852 ◽  
pp. 251-255
Author(s):  
Ya Jing Yan ◽  
Yong Huang ◽  
Qiong Qiong Ding ◽  
Xiao Feng Pang
Keyword(s):  
Calcium Phosphate ◽  
Biomedical Application ◽  
Calcium Phosphates ◽  
Alkaline Treatment ◽  
Calcium Phosphate Coating ◽  
X Ray Diffraction ◽  
Titanium Screw ◽  
Phosphate Coatings ◽  
Titanium Screws ◽  
Calcium Phosphate Coatings

The present paper reports a novel solution to develop a calcium phosphates (CaPs) coating with an anodic nanotubular TiO2layer on titanium screw by electrochemical disposition (ECD). The elemental composition of coatings was examined by energy dispersive spectroscopy (EDS), the surface mopholoy was characterized with scanning electron microscopy (SEM), and the functional groups and crystalline phase were analyzed using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Furthermore, the bioactivity was tested by immersion in simulated body fluid (SBF) for 7 days. The results showed that a nanotubular TiO2layer was established which has about 100 mm diameter and the calcium phosphate coatings have higher bioactivity and porosity compared with uncoated titanium screws, which make the coating more conductive to cell adhesion. Using alkaline treatment, the calcium phosphate coating could transform into hydroxyapatite (HAp), making the coating closer to the biological complement. This provides a valuable tool for biomedical applications.

Parascholzite Coatings on Niobium Substrates

2011 ◽  
Vol 493-494 ◽  
pp. 477-482
Author(s):  
Felipe Nobre Moura ◽  
Luis Henrique Leme Louro ◽  
Luciano Andrade Gobbo ◽  
Marcelo Henrique Prado da Silva
Keyword(s):  
Hydrothermal Process ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings ◽  
Titanium Substrates ◽  
New Phase ◽  
Scanning Electron

This study proposes a hydrothermal process to produce monetite and zinc-doped calcium phosphate coatings with different (Ca+Zn)/P molar ratios, in an attempt to incorporate zinc benefits on bone formation to hydroxyapatite precursors. The method consists of coating niobium and titanium substrates in an aqueous solution rich in (PO4)3-and calcium (Ca)2+ions under specific conditions (pH ≡ 3.7, 80°C). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were performed to characterize the coatings. From XRD analysis, we concluded that substitution of Ca by Zn was feasible up to 15% mol Zn, and the new phase obtained was parascholzite (JCPDS-01-086-2372).

Novel Method of Hydroxyapatite Coating on Titanium Using Chemical Deposition

2007 ◽  
Vol 361-363 ◽  
pp. 617-620 ◽  
Author(s):  
Ramin Rohanizadeh ◽  
Racquel Z. LeGeros
Keyword(s):  
Titanium Substrate ◽  
Chemical Deposition ◽  
Scratch Test ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
Phosphate Ions ◽  
Apatite Coating ◽  
Naoh Solution ◽  
Chemical Deposition Method ◽  
Novel Method

The aim of this study was to deposit an adherent apatite coating on titanium substrate using a two-step chemical deposition method. First, titanium substrates were immersed in an acidic solution containing calcium and phosphate ions, resulting in the deposition of a monetite (CaHPO4) coating. Second, the monetite crystals were converted to apatite by hydrolysis in NaOH solution. Composition and morphology of the initial and final coatings were identified using X-ray diffraction (XRD), Scanning Electron Microscopy, and Energy Dispersive Spectroscopy (EDS). The final coating was porous and the apatite crystals were agglomerated and followed the outline of the large monetite crystals. The average tensile bond of the coating was 5.2 MPa and cohesion failures were observed more frequently than adhesion failures. The coating adhesion measured using scratch test was 13.1N. In conclusion, this study showed the potential of a two-step chemical deposition method for depositing an adherent coating of apatite at low temperatures.

Study of Titanium Surface Topography Influence on Biomimetic Coating Deposition

2012 ◽  
Vol 727-728 ◽  
pp. 1622-1627
Author(s):  
Roseli Marins Balestra ◽  
Alexandre Antunes Ribeiro ◽  
M.C. Andrade ◽  
Luiz Carlos Pereira ◽  
Marize Varella
Keyword(s):  
Powder Metallurgy ◽  
Calcium Phosphate ◽  
Calcium Phosphates ◽  
Titanium Implants ◽  
Precipitation Method ◽  
Phosphate Coatings ◽  
Biomimetic Coating ◽  
Simplified Solution ◽  
Calcium Phosphate Coatings ◽  
Titanium Substrates

Studies show that calcium phosphate coatings on titanium implants improve osseointegration at the implant-bone interface, due to the mineral biocompatibility. Titanium implants can be coated with calcium phosphates by a biomimetic precipitation method. This work studied a biomimetic method under a simplified solution with calcium and phosphorus ions. As substrates, commercially dense titanium sheet and macroporous titanium samples produced by powder metallurgy were used, both ASTM F67 grade 2. The substrates were submitted to chemical and heat treatment and then immersed in the solution for 10 days. Samples characterization was performed by Optical Microscopy (OM), Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS), low angle X-ray Diffractometry (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Powder metallurgy successfully produced macroporous titanium substrates. Calcium phosphate coatings were deposited on both substrates, confirmed by FTIR bands. Such results indicated the potential of this methodology for calcium phosphate coatings on titanium substrates.

Synthesis and Characterization of SrSiO3 by Chemical Deposition Method

2012 ◽  
Vol 204-208 ◽  
pp. 3952-3955 ◽  
Author(s):  
Zheng Quan Zhang ◽  
Yu Ling Wang ◽  
Xiao An Yue ◽  
En Ze Wang ◽  
Li Zhen Zou
Keyword(s):  
Phase Composition ◽  
Sintering Temperature ◽  
Chemical Deposition ◽  
Raw Material ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Deposition Method ◽  
Strontium Silicate

Nitric acid strontium and potassium silicate as raw material, the strontium silicate was synthesized preparation the strontium silicate was synthesized by chemical deposition method， and the strontium silicate was sintered for three hours in 850 °C, 1000 °C and 1150 °C. The effect of sintering temperature on phase composition, microstructure and the influence of purity of strontium silicate was studied using X-ray diffraction and electron scanning electron microscope and differential thermal-hot heavy analyzer. The formation mechanism of strontium silicate by chemical deposition method was analyzed. The results show that: the sintering temperature is effect on phase composition and microstructure of the strontium silicate, Compared with traditional high temperature solid reaction process, the chemical deposition method could greatly reduce the sintering temperature, and improve the powder purity.

scholarly journals Effect of the Porosity, Roughness, Wettability, and Charge of Micro-Arc Coatings on the Efficiency of Doxorubicin Delivery and Suppression of Cancer Cells

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 664
Author(s):  
Mariya Borisovna Sedelnikova ◽  
Ekaterina G. Komarova ◽  
Yurii P. Sharkeev ◽  
Valentina V. Chebodaeva ◽  
Tatiana V. Tolkacheva ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
X Ray Diffraction ◽  
Oxidation Method ◽  
X Ray ◽  
Phosphate Coatings ◽  
Micro Arc Oxidation ◽  
Calcium Phosphate Coatings ◽  
Adsorption Desorption ◽  
Kinetics Of ◽  
Scanning Electron

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.

Principal Physics of Oblique Sputtering of Calcium Phosphate Coatings Using RF-Magnetron Discharge Plasma

2021 ◽  
Vol 63 (11) ◽  
pp. 1891-1897
Author(s):  
K. A. Prosolov ◽  
O. A. Belyavskaya ◽  
V. V. Lastovka ◽  
M. V. Chaikina ◽  
Yu. P. Sharkeev
Keyword(s):  
Calcium Phosphate ◽  
Discharge Plasma ◽  
Magnetron Discharge ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings
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