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Chemical implant fixation using hydroxylapatite coatings

Chemical Implant Fixation Using Hydroxylapatite Coatings

The hypothetical mechanism of bone bonding is chemical. Hydroxyl-apatite coatings permit an implant fixation far superior to current methods using either cemented or cementless techniques. The plan is to study a human total hip prosthesis with hydroxyl-apatite coating for chemical fixation to bone.

Fast synthesis of Lasubstituted apatite by the dry

Fast Synthesis Of Lasubstituted Apatite By The Dry

Compared to pure apatite, La-substituted apatites have improved thermal, mechanical and biological characteristics. In this article, a fast synthesis of La-substituted apatites by a dry mechanochemical method is presented. Structural studies by X-ray diffraction and Fourier transform infrared spectroscopy indicated the formation of a single-phase nanosized product after 30 min of high-energy ...

Wet chemical synthesis of apatitebased waste forms A

Wet Chemical Synthesis Of Apatitebased Waste Forms A

Jun 14, 2017 In this paper, a novel wet chemical synthesis method has been described for immobilizing radioactive iodine obtained from caustic scrubber solutions and silver solid sorbents into the apatite, Pb 10 VO 4 6 I 2, at room temperature. The uptake of iodine for the synthesized waste form has been shown to be 94.6.

PDF Ionic conductivity of apatitetype rareearth

Pdf Ionic Conductivity Of Apatitetype Rareearth

Ionic conductivity of apatite-type rare-earth silicates prepared by mechanical milling. Journal of Alloys and Compounds, 2009. K. Gonzalez Fuentes. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.

PlasmaSprayed Coating of an ApatiteType Lanthanum

Plasmasprayed Coating Of An Apatitetype Lanthanum

Apr 06, 2020 other methods such as mechanochemical synthesis 10 and the sol-gel method 511 have been investigated, but these methods are not ideal either mechanochemical synthesis requires a long milling time and the sol-gel method is complicated by a need for several heating steps. In this study, pure apatite-type lanthanum silicate

Preparation of CalciumStrontium Apatite through

Preparation Of Calciumstrontium Apatite Through

The formation of a calcium-strontium apatite solid solution precursor via mechanochemical method was described. The precursor is formed by a process of ball-milling of a slurry consisting of a mixture of the starting materials CaHPO 4 2H 2 O, CaCO 3, SrHPO 4 and SrOH 4 8H 2 O in a zirconia pot mill for 24 h in the presence of water at room temperature over the entire CaCaSr ...

the Wettability of Apatite and Dolomite

The Wettability Of Apatite And Dolomite

the separation of dolomite from apatite for this kind of magnesium calcium phosphate ore, and an anionic collector, such as sodium oleate, is usually used in the acidic pulp for reverse otation 13. Flotation is a separation method based on the di erence of physical and chemical properties between valuable minerals and gangue minerals 4.

Preparation and Characterization of Nanostructure

Preparation And Characterization Of Nanostructure

this method 6. The method has many advantages such as simplicity and low cost. Pressure can be applied by conventional milling equipment such as attrition, planetary, or vibratory mills ranging from low-energy ball mills to high energy stirred mills 7. So far, extensive research has been conducted on the preparation and characterization

A facile highspeed vibration milling method to mass

A Facile Highspeed Vibration Milling Method To Mass

Apr 13, 2015 A high-speed vibration milling HSVM method was applied to synthesize water-dispersible silicon quantum dots SiQDs. Highly reactive free radicals HOOCCH 2 CH 2 produced from an acyl peroxide under HSVM conditions reacted with hydrophobic Si chips to produce highly water-dispersible SiQDs, which were characterized in detail by spectroscopic and microscopic techniques.

Machining surface finish chart comparator method degree

Machining Surface Finish Chart Comparator Method Degree

Machining surface finish chart, comparator, method, degree, Ra, Rz, RMS. As for machining to iron and steel castings, the surface finish smooth degree is also an important requirement. The following is the conversion chart is from dandong foundry, for Ra um, Ra micro inch, Rz um, RMS and finish degree in China and USA, including the ...

Cryogenic Milling Method to Fabricate Nanostructured

Cryogenic Milling Method To Fabricate Nanostructured

Cryogenic milling was demonstrated as a new and facile method to fabricate nanostructured battery electrode materials. SnSb anode material with 1.2 wt graphite was selected as a model system to demonstrate the feasibility and benefits of this method. Ball milling at a cryogenic temperature can suppress cold-welding, exfoliate bulk graphite powder into nanoplatelets, and evenly disperse them ...

Synthesis Structural Characterization Degradation Rate

Synthesis Structural Characterization Degradation Rate

in vitro by a direct contact method and MTT assay method. Cylindrical-shaped specimens diameter of 10mm, height 5mm were cut from a cylinder block. The milling time was varied for 3 hours, 5 hours, and 7 hours. The specimens were sterilized with an autoclave 121 C for 1 hour. On the direct contact method, specimens were put in a 12-well plate

Fabrication of continuous apatitegraded collagen sponges

Fabrication Of Continuous Apatitegraded Collagen Sponges

May 22, 2019 In this study, as an alternative to multi-layered scaffolds, collagen sponges with an apatite content gradient were fabricated via an electrolytic method. Electrolysis at a constant current mode of i 22 A m 2 with different electrode distances of 2, 3, or 4 cm was conducted for an acidic solution at pH 3.0, including collagen at 0.5 wt ...

An Unprecedented Fully HSubstituted Phosphate Hydride

An Unprecedented Fully Hsubstituted Phosphate Hydride

Nov 19, 2019 The hydride apatite Sr 5 PO 4 3 H Sr 5 PO 4 3 D was prepared by high-energy ball milling of dried Sr 3 PO 4 2 with excess of SrH 2 SrD 2 and subsequent annealing at 500 C for several days under inert conditions.

The high energy milling effect on positional

The High Energy Milling Effect On Positional

The high energy milling is an environmentally friendly technological alternative for ore processing, to the con-ventional acid leaching methods. The high energy milling creates defects in the apatite structure with simultaneous accumulation of mechanic energy. The impact of the mechanical forces over the solids is mostly revealed through the

Mechanical alloying and highrepetitionpulsedlaser

Mechanical Alloying And Highrepetitionpulsedlaser

These methods include calcium oxide CaO, sol-gel synthesized HAP, and diammonium phosphate DAP mechanical alloy. During the study, it was discovered that characterizing nanoparticles showed that nanophase HAP existed in three different forms, and the synthesis of the apatite phase happened in mechanically alloyed powders.

Synthetic Phase with the Structure of Apatite IntechOpen

Synthetic Phase With The Structure Of Apatite Intechopen

Jan 08, 2016 The previous chapters were dedicated to description of structure and properties of minerals from supergroup of apatite and introduction of method for identification and investigation of properties of phosphate minerals. The first synthesis of apatite was performed by Daubr e by passing the PCl3 vapor over red-hot lime. The fourth chapter of this book introduces techniques for the

An inverse method of modeling thermal histories from

An Inverse Method Of Modeling Thermal Histories From

Apatite fission-track FT ages and track length distributions are important sources of information about the thermal histories of rocks. Recent advances in the understanding of track annealing in apatite provide a solution to the forward problem of predicting FT ages and track length distributions that result from a given thermal history. In this paper, a method is presented to address the ...

Conductivity and solid state 29Si NMR studies of apatite

Conductivity And Solid State 29si Nmr Studies Of Apatite

Nov 09, 2011 Abstract Apatite-type lanthanum silicates are of great interest because of their high ionic conductivity in which it is potential to be used as electrolyte for the solid oxide fuel cell SOFC application. In the present work, we report 29 Si solid state NMR studies of several doped lanthanum apatite silicates prepared by hydrothermal method. For the undoped apatite La 9.33 Si 6 O 26 three ...

A new method for uninterrupted monitoring of solidstate

A New Method For Uninterrupted Monitoring Of Solidstate

Jul 20, 2021 A team of chemists from the Croatian Ruer Bokovi Institute RBI described a new, easy-to-use method for uninterrupted monitoring of mechanochemical reactions. These

Milling Machine Methods of Milling Milling Processes

Milling Machine Methods Of Milling Milling Processes

Jun 28, 2009 Milling is an important process of manufacturing technology and basically it refers to the removal of metal from the work piece using a tool which has several cutting points and is rotating about its axis. Thus each cutting point removes a little bit of the metal but since there are multiple such points and the tool is rotating at a fast speed, the overall removal is quite brisk.

Facile low temperature solid state synthesis of

Facile Low Temperature Solid State Synthesis Of

The apatite structure-type has been proposed as a potential waste form for the immobilization of long-lived fission products, such as I-129 however, it is difficult to synthesize iodoapatite without significant iodine loss due to its high volatility. In this study, we report a facile low temperature 50 C solid

Effects of ball milling time on porous Ti 3Ag alloy and

Effects Of Ball Milling Time On Porous Ti 3ag Alloy And

The ball milling time is a key factor in powder refining 26, which directly affects the surface energy of the powders. In this work, four different ball milling time were used to prepare TiAg alloy. The effect of ball milling time during powder metallurgy on porous Ti3Ag alloys and its apatite-inducing ability in a modified simulated body

Ultrastructural analyses of nanoscale apatite

Ultrastructural Analyses Of Nanoscale Apatite

Feb 01, 2008 The mineral films were thinned to 100 nm by thinning both the top and bottom surfaces using the ion-milling method on a cold stage. ... The presence of CO indicates that the calcium phosphate is carbonated apatite. 3, 5, 17 The carbonate content in the apatite prepared by this method is in the range of 38 wt, 5 equivalent to the ...

Carbonation and dehydroxylation of apatite during high

Carbonation And Dehydroxylation Of Apatite During High

Apr 15, 2019 Thermal methods can provide independent information about thermal stability and gasses released during decomposition of non-stoichiometric apatite , , . The aim of this study is to evaluate the isomorphic carbonate incorporation in the structure of hydroxylapatite during transformation of BCPs upon continuous high energy milling, using Raman ...

Synthesis method of hydroxyapatite A review

Synthesis Method Of Hydroxyapatite A Review

Jan 01, 2020 An XRD analysis of the samples showed that the calcium hydroxide phase had disappeared after milling for 15 min and the CaF 2 phase was completely removed after milling for 30 min, indicating that the formation of apatite had begun . The complete transformation of fluorapatite occurred after 6 h of milling.

US20120087850A1 Process for Obtaining Apatite

Us20120087850a1 Process For Obtaining Apatite

The present invention, named BungeFosfertil process, is applicable at different lithologies of phosphate ore with carbonated-silica matrix from igneous and sedimentary sources, i.e., consists of comminutioning the ore by crushing, homogenization, milling and disliming, prior to the apatite flotation. The dislimed and milled ore pulp with solids concentration above 40, being initialy ...

PDF Structural and thermal transformations on high

Pdf Structural And Thermal Transformations On High

In this work we investigated the isomorphic substitution and thermal decomposition of sedimentary fluor apatite FAp with CaP ratio 1.67 from Tunisia after high-energy-milling HEM ...

PDF Effect of highenergy milling and thermal treatment

Pdf Effect Of Highenergy Milling And Thermal Treatment

Effect of high-energy milling and thermal treatment on the solid-phase reactions in apatiteammonium sulphate system May 2014 Journal of Thermal Analysis and

The effects of particle size milling method and thermal

The Effects Of Particle Size Milling Method And Thermal

Various milling methods result in different particle size distributions and, in combination with mash and thermal treatment expandate of the feed, may have an impact on nutrient digestibility, pH of the digesta and subsequently the performance of an animal. Since this aspect has not been widely co

RoomTemperature Synthesis of ApatiteType Lanthanum

Roomtemperature Synthesis Of Apatitetype Lanthanum

In this paper we report the synthesis and structural characterization of Na0.96Ho9.04SiO46Cl0.02O1.98 apatite prepared by mechanical milling at room temperature, in which well crystallized ...

Sandia National Laboratories News Releases An apatite

Sandia National Laboratories News Releases An Apatite

Oct 20, 2015 PNNL will evaluate the apatite barrier in laboratory studies. If the laboratory studies indicate the apatite will hold uranium we will move on to field studies at the DOEs Uranium Mill Tailings Remedial Action field site near Rifle, Colorado, Rigali said. Another potential application is the remediation of Hanford tank waste.

Powder Xray diffraction studies of hydroxyapatite and

Powder Xray Diffraction Studies Of Hydroxyapatite And

May 01, 2018 Samples of sintered biphasic calcium phosphates hydroxyapatite Ca 10 PO 4 6 OH 2 and -tricalcium phosphate Ca 3 PO 4 2 subjected to high energy dry milling for different durations are studied by powder X-ray diffraction analysis. The Rietveld method as implemented in the FullProf program was applied in order to determine the quantities of the resulting crystalline phases and ...

Structural and thermal transformations on high energy

Structural And Thermal Transformations On High Energy

uor apatite FAp with CaP ratio1.67 from Tunisia after high-energy-milling HEM activation at different times from 10 to 600 min. The chemical composition of the material includes 29.6 ...

Rare Earth Doped Apatite Nanomaterials for Biological

Rare Earth Doped Apatite Nanomaterials For Biological

Mar 19, 2015 According to the literature, there are several methods reported to prepare RE doped apatite particles for biomedical application such as solid state synthesis method, chemical precipitation method, and sol gel method. 3.1. Solid State Reaction. As a simple procedure, solid state reaction can be employed in the mass production of apatite particles.