Current Search: FAU Graduate Student Research (x) » Kathriarachchi, Vindu (x) » abstract (x)
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Title
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Crystal structure studies of cone snail shells by powder x-ray diffraction.
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Creator
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Khanal, Suraj P., Kathriarachchi, Vindu, Kyriacou, Andreas, Leventouri, Theodora, Graduate College
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Date Issued
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2011-04-08
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PURL
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http://purl.flvc.org/fcla/dt/3165805
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Subject Headings
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Snails, Shells, X-rays --Diffraction
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Format
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Document (PDF)
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Title
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Effect of preparation temperature on crystal structure and magnetic properties of nanophase Fe-substituted hydroxyapatite.
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Creator
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Kathriarachchi, Vindu, Leventouri, Theodora, Sorge, Korey D., Graduate College
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Date Issued
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2013-04-12
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PURL
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http://purl.flvc.org/fcla/dt/3361934
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Subject Headings
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Hydroxyapatite, Magnetic properties, Crystals--Structure, Temperature
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Format
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Document (PDF)
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Title
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Effect of Preparation Temperature on Crystal Structure and Magnetic Properties of Nanophase Fe-Substituted Hydroxyapatite.
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Creator
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Kathriarachchi, Vindu, Sorge, Korey D., Leventouri, Theodora, Graduate College
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Abstract/Description
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The purpose of the study is to investigate the effect of preparation temperature on the crystal structure and magnetic properties of nanophase Fe-substituted Hydroxyapatite. Multisubstituted Hydroxyapatite (HAp), Ca5(PO4)3OH, is the main mineral phase in physiological apatite, ~70 wt% in bones and dentin, and ~96 wt% in enamel. Iron is one of the minor substitution elements (0.01-0.1 wt% in bone and 0.003 wt% in enamel) replacing Ca in the HAp structure. Research interest on Fe-HAp is related...
Show moreThe purpose of the study is to investigate the effect of preparation temperature on the crystal structure and magnetic properties of nanophase Fe-substituted Hydroxyapatite. Multisubstituted Hydroxyapatite (HAp), Ca5(PO4)3OH, is the main mineral phase in physiological apatite, ~70 wt% in bones and dentin, and ~96 wt% in enamel. Iron is one of the minor substitution elements (0.01-0.1 wt% in bone and 0.003 wt% in enamel) replacing Ca in the HAp structure. Research interest on Fe-HAp is related to the fact that Fe for Ca substitution reduces the solubility of HAp therefore it functions as a cavities preventive agent. In contrast, Fe overload causes a decrease in bone mechanical strength. Furthermore, Fe-HAp can find applications in hyperthermia based anti-cancer treatments and in magnetic resonance imaging (MRI) contrast agents. Two sets of Ca5-xFex(PO4)3OH samples (x=0,0.05,0.1,0.2,0.3) were synthesized by a chemical precipitation method at physiological temperature (370C) and 800C. The samples were calcinated at 6500C and deuterated at 6000C. The samples were characterized by x-ray powder diffraction (XRD), neutron powder diffraction (NPD) and SQUID Magnetometry. A single-phase system was detected for nominal iron content x≤0.1 by XRD phase identification in both sets of samples, while hematite (α-Fe2O3) and/or maghemite (γ- Fe2O3) develops starting at x=0.1. According to the magnetic measurements, sample with x=0 showed diamagnetic behavior while samples with Fe showed paramagnetic behavior. Combined Rietveld refinements of XRD and NPD patterns will provide accurate information on the effect of processing temperature on the crystallographic parameters of the nano-materials.
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Date Issued
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2014
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PURL
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http://purl.flvc.org/fau/fd/FA00005825
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Format
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Document (PDF)
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Title
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Effect of preparation temperature on crystal structure properties on nanophase Fe-substituted hydroxyapatite.
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Creator
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Kathriarachchi, Vindu, Kyriacou, Andreas, Khanal, Suraj P., Leventouri, Theodora, Graduate College
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Date Issued
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2012-03-30
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PURL
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http://purl.flvc.org/fcla/dt/3342385
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Format
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Document (PDF)