gelcasting of mechanochemically synthesized hydroxyapatite
Gelcasting methodsLockheed Martin Energy Research Corp.
(a) In prior gelcasting evaluations limited dispersion/loading of Hydroxyapatite (HA) resulted in inadequate sintered part density. As a general rule a minimum inorganic powder loading of approximately 40 volume percent is needed to produce a gelcast part capable of being effectively machined and sintered.
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Slip casting of mechanochemically synthesized hydroxyapatite
adshelp at cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
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USAGelcasting methodsGoogle Patents
A method of gelcasting includes the steps of providing a solution of at least hydroxymethylacrylamide (HMAM) and water. At least one inorganic powder is added to the mixture. At least one initiator system is provided to polymerize the HMAM. The initiator polymerizes the HMAM and water to form a firm hydrogel that contains the inorganic powder.
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Gelcasting of Mechanochemically Synthesized Hydroxyapatite
Gelcasting of Mechanochemically Synthesized Hydroxyapatite . By Yu Jia Yuji Hotta Hydroxyapatite powders were prepared via mechanochemical synthesis method. The starting reagents for HAP powders were vibration ball milled for 2 h and then calcined at 800˚C for 1 h. X-ray diffraction patterns and IR spectrum shown that pure crystalline
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Simple and Rapid Synthesis of Magnetite/Hydroxyapatite
Immediately following the synthesis carbonate-substituted (B-type) hydroxyapatite particles are mechanochemically synthesized by wet milling dicalcium phosphate dihydrate and calcium carbonate in a dispersed suspension of magnetite nanoparticles during which the magnetite nanoparticles are incorporated into the hydroxyapatite matrix.
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Microstructure and mechanical property of synthesized
Synthesized hydroxyapatite (HAp) was prepared by the colloidal process. Mixed slurry composed of 25 vol HAp powder and 75 vol aqueous solution containing a small amount of polycarboxylic acid ammonium as dispersant was produced.
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Mechanochemical Synthesis of SiO44–‐Substituted
Mar 22 2016 · Abstract Thermal stability of mechanochemically synthesized silicon‐substituted hydroxyapatite containing 0.6 0.8 1.0 and 1.2 mol of silicon per mol of apatite unit cell has been studied for the first time. The powders of the silicon‐substituted hydroxyapatite were annealed within the temperature range 700–1300 °C.
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Multifunctional Hydroxyapatite/Na(Y/Gd)F4 Yb3 Er3
Porous hydroxyapatite (HAp) composite fibers functionalized with up-conversion (UC) luminescent and magnetic Na(Y/Gd)F4 Yb3 Er3 nanocrystals (NCs) have been fabricated via electrospinning. After transferring hydrophobic oleic acid-capped Na(Y/Gd)F4 Yb3 Er3 NCs into aqueous solution these water-dispersible NCs were dispersed into precursor electrospun solution containing CTAB.
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Thermal stability of nano hydroxyapatite synthesized from
Nano hydroxyapatite (HA) was synthesized by a wet chemical reaction route using powdered sea shells (CaO) as starting material which was converted to calcium hydroxide (Ca(OH)2) and subsequently reacted with phosphoric acid (H3PO4) by slow addition maintaining a Ca P ratio of 1.67. The synthesized samples showed X-ray diffraction (XRD) patterns corresponding to phase pure
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hydroxyapatite phase were determined with Bruker X Pert Plus software. The crystallinity degree (Xc) was calculated as Xc = 1(V 112/300/I 300) where I 300 is the intensity of (3 0 0) reflection of HA and V 112/300 is the intensity of the hollow between (1 1 2) and (3 0 0) reflections. The as-synthesized Na-free HA and Na-doped HA
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Apr 18 2015 · 1 synthesis methods for nanosized hydroxyapatite with diverse structures.24 31. 1. 4 Märten A Fratzl P Paris O Zaslansky P. On the mineral in collagen of human crown dentine. Biomaterials 201031 5479–90. 5 Hu YY Rawal A Schmidt-Rohr K. Strongly bound citrate stabilizes the apatite nanocrystals in bone.
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Egg White as an Environmentally Friendly Low‐Cost Binder
Slurries with different solids loading (34–50 vol ) of alumina were made with egg white (ovalbumin)–water premix. The ovalbumin content in the premix was
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Mechanochemical Preparation of 8-Hydroxyquinoline
Hybrid nanocrystals of 8-hydroxyquinoline (8Hq) molecules and hydroxyapatite nanocrystals (HAp) were successfully prepared by a mechanochemical solid-state reaction. The hybrid nanocrystals exhibit a significant thermal stability and efficient photoluminescence peak at 500 nm which were attributed to metal–ligand charge transfer at the interface between the oxygen atoms of 8Hq and the
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(PDF) HYDROXYAPATITE–CIPROFLOXACIN MINIPELLETS FOR
The FT-IR spectrum of synthesized ciprofloxacin adsorption by synthesized HAp HAp blank powder shows the characteristic peaks powders) and remains almost the same up to 48 DEVELOPMENT -1 namely the PO4 narrow peak at 963 cm the PO4 hours in case of 8ºC 35ºC and 45ºC temperature -1 -1 peak at 1039 cm the PO4 peaks at 604 cm and (Figure 4).
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In vivo evaluation of hydroxyapatite foams P. Sepulveda 1 A. H. Bressiani 1 J. C. Bressiani1 L. Meseguer 2 B. Ko¨nig Jr.3 1 Instituto de Pesquisas Energe´ticas e Nucleares IPEN/CNEN Cidade Universita´ria C. P. 11049-Pinheiros Sa˜o Paulo SP Brazil 2 Universidad de Murcia Laboratorio de Cirurgia Ortopedica Experimental (Prof. M. Clavel-Sainz) Spain 3 Department of
Chat OnlineThermal stability of nano hydroxyapatite synthesized from
Nano hydroxyapatite (HA) was synthesized by a wet chemical reaction route using powdered sea shells (CaO) as starting material which was converted to calcium hydroxide (Ca(OH)2) and subsequently reacted with phosphoric acid (H3PO4) by slow addition maintaining a Ca P ratio of 1.67. The synthesized samples showed X-ray diffraction (XRD) patterns corresponding to phase pure
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Dispersion behavior of wet chemical synthesized hydroxyapatite
The use of hydroxyapatite (HA) as a ceramic material for osteo-implants is restricted because of its low mechanical strength and low toughness. Gelcasting method is used to obtain a high density forming body of HA. In this paper the wet chemical synthesized HA powder was characterized in order to investigate its dispersing behavior and develop gelcasting slips suitable to produce samples of
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Mechanochemical synthesis of nanohydroxyapatite bioceramics
Keywords Mechanochemical synthesis Nanomaterials Hydroxyapatite Bioceramics Hydroxyapatite (HA) is commonly used for a number of biomedical applications in the forms of granules blocks 1 coatings and dense bodies 1-5 for bone augmentation. HA has also been found useful for drug delivery and antibiotics 6. It exists naturally in human
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Structural and Mechanical Behavior of Mechanochemically
The aim of the present investigation is to develop mechanochemically synthesized nano-crystalline hydroxyapatite (nHAp) bioceramics using clam seashells and phosphoric acid by varying the CaO H 3 PO 4 acid at different wt ratios i.e. 1 0.75 1 1.0 1 1.25 1 1.5 and 1 1.75. The synthesized powders were characterized using X- ray diffraction ( XRD) scanning electron microscope and high
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The Conceptual Framework of Hydroxyapatite Fiber Structure
Mar 23 2016 · Padilla S. Garcı́a-Carrodeguas R. Vallet-Reg M. (2004). Hydroxyapatite suspensions as a precursors of pieces obtained by gelcasting method. Journal of Europian Ceramic Society 24(8) 2223–2232. CrossRef Google Scholar
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Porous hydroxyapatite-based obturation materials for
Jan 01 2011 · Porous hydroxyapatite-based obturation materials for dentistryVolume 23 Issue 6Witold Brostow Miriam Estevez Haley E. Hagg Lobland Ly Hoang J.
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CERTIFICATE This is to certify that the thesis entitled ―Sol-gel synthesis of glass-ceramics using rice husk ash and its gelcasting‖ submitted by Mr. Raja Bipul Warjri in partial fulfillment of the requirements for the degree of Bachelor of Technology in Ceramic Engineering at National Institute of Technology Rourkela is an authentic work carried out by him under my supervision
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Synthesis and Mechanism of Tetracalcium Phosphate from
Tetracalcium phosphate (TTCP Ca 4 (PO 4 ) 2 O) was prepared by the calcination of coprecipitated mixture of nanoscale hydroxyapatite (HA Ca 10 (PO 4 ) 6 (OH) 2 ) and calcium carbonate crystal (CaCO 3 ) followed by cooling in the air or furnace. The effect of calcination temperature on crystal structure and phase composition of the coprecipitation mixture was characterized by transmission
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(PDF) In vivo evaluation of hydroxyapatite foams Ana
In vivo evaluation of hydroxyapatite foams P. Sepulveda 1 A. H. Bressiani 1 J. C. Bressiani1 L. Meseguer 2 B. Ko¨nig Jr.3 1 Instituto de Pesquisas Energe´ticas e Nucleares IPEN/CNEN Cidade Universita´ria C. P. 11049-Pinheiros Sa˜o Paulo SP Brazil 2 Universidad de Murcia Laboratorio de Cirurgia Ortopedica Experimental (Prof. M. Clavel-Sainz) Spain 3 Department of
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Simple and Rapid Synthesis of Magnetite/Hydroxyapatite
hydroxyapatite particles are mechanochemically synthesized by wet milling dicalcium phosphate dihydrate and calcium carbonate in a dispersed suspension of magnetite nanoparticles during which the magnetite nanoparticles are incorporated into the hydroxyapatite matrix. We observed that the resultant magnetite/hydroxyapatite composites
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Mechanochemical Synthesis of Magnetite/Hydroxyapatite
Jun 10 2013 · 1. Introduction. Hydroxyapatite (Ca 10 (PO 4) 6 (OH) 2 HA) which is a calcium phosphate ceramic has been widely used as a biomaterial in various applications (e.g. artificial bone and dental root cosmetic foundation etc.) because of its high biocompatibility and chemical stability.Moreover many attempts are being made to give new functions to HA by incorporating
Chat OnlineFabrication and physico-mechanical properties of thin
Mechanochemically synthesized Ag-HA powder (Ca 10⿿x Ag x (PO 4 ) 6 (OH) 2⿿x x = 1.5) was used as a precursor for sputtering target preparation. Morphology composition crystallinity physico-mechanical features (Young s modulus and nanohardness) of the deposited Ag-HA coatings were investigated.
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(PDF) In vivo evaluation of hydroxyapatite foams Ana
In vivo evaluation of hydroxyapatite foams P. Sepulveda 1 A. H. Bressiani 1 J. C. Bressiani1 L. Meseguer 2 B. Ko¨nig Jr.3 1 Instituto de Pesquisas Energe´ticas e Nucleares IPEN/CNEN Cidade Universita´ria C. P. 11049-Pinheiros Sa˜o Paulo SP Brazil 2 Universidad de Murcia Laboratorio de Cirurgia Ortopedica Experimental (Prof. M. Clavel-Sainz) Spain 3 Department of
Chat OnlineFabrication and physico-mechanical properties of thin
Mechanochemically synthesized Ag-HA powder (Ca 10⿿x Ag x (PO 4 ) 6 (OH) 2⿿x x = 1.5) was used as a precursor for sputtering target preparation. Morphology composition crystallinity physico-mechanical features (Young s modulus and nanohardness) of the deposited Ag-HA coatings were investigated.
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Nov 02 2010 · This is known as stoichiometric hydroxyapatite and its atomic ratio Ca/P is 1.67. Its chemical formula is Ca 10 (PO 4) 6 (OH) 2 with 39 by weight of Ca 18.5 P and 3.38 of OH. Hydroxyapatite crystallizes in a hexagonal system although with some exception in a monoclinic system (Elliot et al. 1973 Kay et al. 1964).
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