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Showing 1 to 20 of 188 for “"hydroxyapatite"”.
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Optimisation of plasma sprayed hydroxyapatite coatings
Hydroxyapatite, (HA), is a calcium phosphate bioceramic material which has an almost identical chemical composition to that of the mineral component of bone. Its biocompatibility and osteoconductivity have led to its use in a wide range of applications in both dentistry and orthopaedics. One such …
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Synthesis of hydroxyapatite with adsorbed and intracrystalline biomolecules
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions
… study investigates surface interactions of hydroxyapatite, a prebiotically plausible phosphate mineral source on the early Earth, with urea-rich solvents (urea, ammonium formate, and water, UAFW) and magnesium sulfate. Time-dependent infrared studies were conducted via polarization modulated …
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Fabrication and Characterization of Titanium-doped Hydroxyapatite Thin Films
Hydroxyapatite [Ca10(PO4)6(OH)2, HA] is used in many biomedical applications including bone grafts and joint replacements. Due to its structural and chemical similarities to human bone mineral, HA promotes growth of bone tissue directly on its surface. Substitution of other elements has shown the …
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Enhancing the mechanical properties of a hydroxyapatite-collagen bone surrogate
<p>The synthesis of biomimetic hydroxyapatite-collagen composites is desirable from the perspective of graft elimination and load-bearing support when treating damaged or diseased bone. Bone is an organized network of carbonated hydroxyapatite mineralized collagen, whose strength and toughness is …
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Magnesium doped hydroxyapatite/sodium alginate biocomposite for bone implants application
Magnesium-doped Hydroxyapatite/Sodium alginate was successfully prepared by using precipitation method and this research was implement to enhance the physical, mechanical and biological properties of HA/SA. The properties of this materials are attributed to more cost-efficient, eco-friendly and …
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Electrohydrodynamic deposition and patterning of nano-hydroxyapatite for biomedical applications
… is aimed at using EHDA spraying to produce hydroxyapatite (HA) deposition with desirable chemical, topographical and biological characteristics for bone implant. In principle, the EHDA process involves the flow of liquid/suspension from a needle under the influence of an electric field which …
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Production and characterisation of hydroxyapatite/multi-walled carbon nanotube composites
Hydroxyapatite (HA) is a biologically active ceramic that is used in surgery to replace bone. While HA promotes bone growth along its surface, its mechanical properties are not sufficient for major load-bearing medical devices. Carbon nanotubes (CNTs), as one of the strongest and stiffest materials …
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A Mechanical and Histological Study of Functionally Graded Hydroxyapatite Implant Coatings
… interaction of functionally graded, thin film hydroxyapatite (HA) coatings in an animal model. The rationale for the graded coatings is such that they elicit different biological responses from different layers within the thin film (less than two microns). As such in this study, the graded …
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Probing structure-property relationships of calcium hydroxyapatite defluoridation to enhance performance
… (WHO) recommended level of 1.5 mg/L. Calcium hydroxyapatite (HAP, Ca5(PO4)3X, where X=OH) nanoparticles (NPs) formed into pellets and used in fixed-bed column reactors are among a handful of technologies recommended by the WHO for low income contexts. In the environmental engineering …
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A study on the use of indigenous New Zealand plant fibres for producing biomorphic hydroxyapatite fibres and chars used in reinforcing biomedical hydroxyapatite sourced from cattle bone
… describes studies on the use of animal derived hydroxyapatite (HAp) with natural plant fibres. The study was divided into two sections, a major section and a minor section. The major section describes animal derived hydroxyapatite (HAp)-char composites containing low weight percent additions of …
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Patterning Strategies of Poly(ethylene glycol) Based Hydroxyapatite Composites for Biomedical Applications
Die vorgelegte Arbeit beinhaltet zwei fundamental unterschiedliche Herangehensweisen, Soft Lithographie in Form von Fillmolding In Capillaries (FIMIC) und die Fabrikation von 3D Werkzeugen um kontrolliertes Zelladhäsionsverhalten durch gezielte chemische Strukturierung zu erreichen. Es ist weithin …
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Design of experiment analysis of high velocity oxy-fuel coating of hydroxyapatite
… the particles. HVOF has the potential to produce Hydroxyapatite HA (Bio-ceramic) coatings based on its experience with other sprayed materials, this technique should offer mechanical and biological results compared to other thermal spraying process such as plasma spray. Deposition of HA via HVOF …
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Optimisation of hydroxyapatite (HAp) for orthopaedic application via the chemical precipitation technique
Hydroxyapatite, (HAp), Ca₁₀(PO₄)₆(OH)₂, is a naturally occurring mineral found in the inorganic component of human bone and enamel. The constituent elements of HAp are primarily calcium and phosphorous, with a stoichiometric calcium to phosphorous ratio of 1.667 capable of promoting intimate bone …
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Fabrication of hydroxyapatite-biodegradable polymer scaffolds by electrospinning for potential bone tissue application
… study is to determine the potential of combining hydroxyapatite (HA) and polymers to form synthetic composite materials used for bone tissue engineering applications. In this study, ceramic-biodegradable polymer composites are fabricated by electrospinning method. The biodegradable polymers used …
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Microstructure-induced capillary force effects on penetration and release in hydroxyapatite bone scaffolds
… bone formation and integration in micorporous hydroxyapatite (HA) scaffolds. Microporous scaffolds can “self load” cells and molecules upon implantation via micropore-induced capillary forces. The localization and entrapment of cells within the micropores forms a reservoir of cells that not …
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Long-term osteointegration of BMP-2 eluting hydroxyapatite scaffolds for bone tissue engineering
… defecits. Due to its chemical similarity, porous hydroxyapatite (HA) remains a candidate biomaterial for synthetic bone grafting. This thesis investigates a potential method to improve osteointegration of these hydroxyapatite bone scaffolds, the delivery of recombinant human bone morphogenetic …
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