SYNTHESIS AND CHARACTERIZATION OF CALCIUM
by centrifuging. The calcium phosphate obtained was dried at 120 ºC for 2.5 hours and calcined at 1050 ºC for 2.5 hours more. This thermal treatment made calcium phosphate more crystalline and destroyed and volatilized the nitrate and ammonium traces trapped in the solid. Characterization Specific surface of calcium phosphate was
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Thermal preparation of highly porous calcium phosphate
Mar 24 2010 · A sustainable marine-derived bioceramic with a unique porous structure has been developed for hard tissue repair. The conversion of alga was achieved through a novel technique involving well controlled thermal processing followed by low pressure–temperature hydrothermal synthesis. In its preparation a heat treatment step was required to remove the organic compounds
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Preparation and Properties of Biphasic Calcium Phosphate
A well-developed BCP scaffolds coated with multilayer of HA/PLLA nanocomposites with interconnectivity high porosity and moderate compressive strength as well as good biocompatibility were fabricated for bone tissue engineering. After being multiply coated with HA/PLLA nanocomposites the scaffolds maintained the BCP framework structure and the porous network structure of scaffolds
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EPB1Method of preparing porous calcium phosphate
EPB1 EPA EPA EPB1 EP B1 EP B1 EP B1 EP A EP A EP A EP A EP A EP A EP B1 EP B1 EP B1 Authority EP European Patent Office Prior art keywords morsels gelatin granules calcium phosphate powder Prior art date Legal
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Highly Porous Amorphous Calcium Phosphate for Drug
Amorphous calcium phosphate (ACP) has shown significant effects on the biomineralization and promising applications in bio-medicine. However the limited stability and porosity of ACP material restrict its practical applications. A storage stable highly porous ACP with Brunauer–Emmett–Teller surface area of over 400 m2/g was synthesized by introducing phosphoric acid to a methanol
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Preparation of Porous Biphasic Calcium Phosphate-Gelatin
A new porous structure as a bone tissue engineering scaffold was developed by a freeze-drying method. The porous nanocomposite was prepared from Biphasic Calcium Phosphate (BCP) which was a mixture of 70 hydroxy apatite and 30 ß-TCP (ß-Tricalcium Phosphate). Porogen was naphthalene and gelatin from bovine skin type B was used as polymer.
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EPA1Porous calcium phosphate bone replacement
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Evaluation of Two Highly Porous Microcrystalline Biphasic
A biphasic bone grafting biomaterial based on a mixture of calcium phosphates and beta-tricalcium phosphate (β-TCP) phases with high nanoporosity was synthesized. The synthesis route was based on calcium phosphate composition and the incorporation of glycolic acid as a pore former giving a material composed of 97 β-TCP and 3 calcium orthophosphates (CaPO4).
Get PriceEffect of Thermal Treatment of the Hydroxyapatite Powders
The effect of thermal treatment of the hydroxyapatite powders on the micropore structure of porous biphasic calcium phosphate (BCP) granules was examined. The porous BCP granules could be attained through mixing and sintering/fracturing thermally treated 60 wt hydroxyapatite powders and calcined 40 wt β-tricalcium phosphate powders. The observed Scanning electron microscopy (SEM
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Synthesis and Thermal Stability of Hydroxyapatite−β
Dec 08 2005 · The preparation of biphasic mixtures (HAP β-TCP) of controlled ratios with the combined substitution of essential biocompatible trace elements (Na Mg and F) was carried out by an aqueous precipitation method. The results showed that incorporated elements have played a significant role in the thermal stability of the apatites up to 1400 °C and that increased calcium deficiency in
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Effect of Thermal Treatment of the Hydroxyapatite Powders
Effect of Thermal Treatment of the Hydroxyapatite Powders on the Micropore and Microstructure of Porous Biphasic Calcium Phosphate Composite Granules 115 (from Spectrum USA) powders and 40 wt β-trical- cium phosphate powders in a distilled water. The -tri- β calcium phosphate powders were synthesized through a chemical precipitation reaction.
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Synthesis of tri-calcium phosphate sponges by interfacial
Porous films of β- or α-tri-calcium phosphate (TCP) were prepared by thermal transformation at 1000 °C or 1200 °C respectively of thin calcium phosphate/calcium carbonate precursor films precipitated at the air/water interface of a supersaturated carbonic acid solution containing 60 ppm sodium polyaspartate and a PO 4 3− CO 3 2− ratio of ca. 2 1.
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Preparation of Protein–Peptide–Calcium Phosphate
Protein–peptide–calcium phosphate composites were developed for achieving sustainable and controlled protein release. Bovine serum albumin (BSA) as a model acidic protein was efficiently encapsulated with basic polypeptides such as polylysine and polyarginine during the precipitation of calcium phosphate (CaP). The prepared composites were fully characterized in terms of their
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(PDF) Preparation of hydroxyapatite from animal bones
This study was performed to quantify the bony ingrowth and biodegradability of two porous calcium phosphate ceramics with four different pore size ranges (45-80 microm 80-140 microm
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Highly Porous Amorphous Calcium Phosphate for Drug
Amorphous calcium phosphate (ACP) has shown significant effects on the biomineralization and promising applications in bio-medicine. However the limited stability and porosity of ACP material restrict its practical applications. A storage stable highly porous ACP with Brunauer–Emmett–Teller surface area of over 400 m2/g was synthesized by introducing phosphoric acid to a methanol
Get PriceEffect of Thermal Treatment of the Hydroxyapatite Powders
The effect of thermal treatment of the hydroxyapatite powders on the micropore structure of porous biphasic calcium phosphate (BCP) granules was examined. The porous BCP granules could be attained through mixing and sintering/fracturing thermally treated 60 wt hydroxyapatite powders and calcined 40 wt β-tricalcium phosphate powders. The observed Scanning electron microscopy (SEM
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Porous calcium phosphate ceramics modified with PLGA
Mar 01 2007 · However the mechanical strengths of the porous hydroxyapatite-based calcium phosphate samples were far too low (≪ 1 MPa). After impregnating and coating with the bioactive glass (33 wt. )–PLGA composite the macropores of the sintered porous calcium phosphate (mainly hydroxyapatite) ceramics remained highly interconnected.
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Preparation and properties of a porous calcium phosphate
Materials Science-Poland Vol. 25 No. 4 2007 Preparation and properties of a porous calcium phosphate bone graft substitute S. M. RABIEE1 2 F. MOZTARZADEH1 H. S. KENARI3 M. SOLATI-HASHJIN1 1 Department of Medical Engineering Amirkabir University Hafis Ave. Tehran Iran P. O. Box 2 Department of Engineering and Technology Mazandaran University Babolsar
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Porous calcium phosphate ceramics prepared by coating
The new method involved the use of polyurethane foams to produce highly porous calcium phosphate cements (CPCs). By firing the porous CPCs at 1200 oC and preparation of porous calcium phosphate (hydroxyapatite-based) ceramics from the porous CPC. The starting materials were
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Porous calcium phosphate composite bioceramic beads
Aug 01 2018 · In this study porous calcium phosphate composite bioceramic beads were prepared by sintering the organic/inorganic hybrid pellets which were readily obtained by extrusion-spheronization of wet mass containing β-tricalcium phosphate phosphate-based glass (PG) excipients and binders.
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Evaluation of Two Highly Porous Microcrystalline Biphasic
A biphasic bone grafting biomaterial based on a mixture of calcium phosphates and beta-tricalcium phosphate (β-TCP) phases with high nanoporosity was synthesized. The synthesis route was based on calcium phosphate composition and the incorporation of glycolic acid as a pore former giving a material composed of 97 β-TCP and 3 calcium orthophosphates (CaPO4).
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(PDF) Preparation of hydroxyapatite from animal bones
This study was performed to quantify the bony ingrowth and biodegradability of two porous calcium phosphate ceramics with four different pore size ranges (45-80 microm 80-140 microm
Get Price
EPB1Method of preparing porous calcium phosphate
EPB1 EPA EPA EPB1 EP B1 EP B1 EP B1 EP A EP A EP A EP A EP A EP A EP B1 EP B1 EP B1 Authority EP European Patent Office Prior art keywords morsels gelatin granules calcium phosphate powder Prior art date Legal
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Preparation of Protein–Peptide–Calcium Phosphate
Protein–peptide–calcium phosphate composites were developed for achieving sustainable and controlled protein release. Bovine serum albumin (BSA) as a model acidic protein was efficiently encapsulated with basic polypeptides such as polylysine and polyarginine during the precipitation of calcium phosphate (CaP). The prepared composites were fully characterized in terms of their
Get PriceThermal spraying of functionally graded calcium phosphate
Biomedical requirements in a prosthesis are often complex and diverse in nature. Biomaterials for implants have to display a wide range of adaptability to suit the various stages of the bio-integration process of any foreign material into the human body. Often a combination of materials is needed. The preparation of a functionally graded bioceramic coating composed of essentially calcium
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Calcium phosphate bioceramics prepared from wet
activity calcium phosphate (CaP) ceramics are widely used as biomedical implant materials. Biomaterials and bioceramics made of calcium phosphates are produced in different forms granules blocks (dense or porous) injectable compositions self-hardening cements coat-ings on metallic implants composites from polymers and so forth 3 .
Get PricePreparation of Porous Glass Scaffolds by Salt Sintering
Request PDF Preparation of Porous Glass Scaffolds by Salt Sintering Technique This paper reports a preliminary study on the development and characterization of a porous calcium phosphate
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Effect of the preparation methods on architecture
Thermal analysis (DSC) showed that the preparation method of materials and addition of bioactive glass particles into polymer matrix induced the changes of PCL crystallinity. Composites obtained by SCPL and PI method containing A2 SBG rapidly formed a hydroxyapatite calcium phosphate surface layer after incubation in SBF.
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Preparation of highly wettable coatings on Ti–6Al–4V ELI
Nov 13 2020 · The presence of additives such as calcium acetate hydrate (C 4 H 6 O 4 Ca∙H 2 O) disodium hydrogen phosphate (Na 2 HPO 4) sodium silicate
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