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Effect of preparation temperature on crystal structure and magnetic properties of nanophase Fe-substituted hydroxyapatite
Title
Effect of preparation temperature on crystal structure and magnetic properties of nanophase Fe-substituted hydroxyapatite.
Creator
Kathriarachchi, Vindu, Leventouri, Theodora, Sorge, Korey D., Graduate College
Date Issued
2013-04-12
PURL
http://purl.flvc.org/fcla/dt/3361934
Subject Headings
Hydroxyapatite, Magnetic properties, Crystals--Structure, Temperature
Format
Document (PDF)
Effect of Preparation Temperature on Crystal Structure and Magnetic Properties of Nanophase Fe-Substituted Hydroxyapatite
Title
Effect of Preparation Temperature on Crystal Structure and Magnetic Properties of Nanophase Fe-Substituted Hydroxyapatite.
Creator
Kathriarachchi, Vindu, Sorge, Korey D., Leventouri, Theodora, Graduate College
Abstract/Description
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
2014
PURL
http://purl.flvc.org/fau/fd/FA00005825
Format
Document (PDF)
Simulation and Construction of a Maxwell Coil
Title
Simulation and Construction of a Maxwell Coil.
Creator
Padron, Andrea, Cheng, Wen-Chung, Sorge, Korey D., Charles E. Schmidt College of Science
Abstract/Description
The Maxwell Coil is a collection of different sized current-carrying rings that, when placed in a specific arrangement, produces a uniquely uniform magnetic field. We have composed numerical representations of this coil arrangement using Microsoft Excel and visual simulations using Mathematica to study the uniformity of the magnetic field produced by the Maxwell Coil. We also construct a physical Maxwell coil using 3D printing and traditional electronic components and compare results of field...
Show moreThe Maxwell Coil is a collection of different sized current-carrying rings that, when placed in a specific arrangement, produces a uniquely uniform magnetic field. We have composed numerical representations of this coil arrangement using Microsoft Excel and visual simulations using Mathematica to study the uniformity of the magnetic field produced by the Maxwell Coil. We also construct a physical Maxwell coil using 3D printing and traditional electronic components and compare results of field uniformity with those of the numerical simulations. We find that the Maxwell coil provides the benefit of both high uniformity in field and high mechanical accessibility to that field. These properties allow us to better study special properties of this field experimentally.
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Date Issued
2015
PURL
http://purl.flvc.org/fau/fd/FA00005205
Subject Headings
College students --Research --United States.
Format
Document (PDF)
Magnetic alignment of swcnt(cooh)s coated by fe3o4 in sc-15 epoxy and anisotropy of physical properties
Title
Magnetic alignment of swcnt(cooh)s coated by fe3o4 in sc-15 epoxy and anisotropy of physical properties.
Creator
Malkina, Olga, Sorge, Korey D., Rangari, V. K., Graduate College, Mahfuz, Hassan
Date Issued
2011-04-08
PURL
http://purl.flvc.org/fcla/dt/3164623
Subject Headings
Anisotropy, Electromagnetism, Nanotubes
Format
Document (PDF)
Magnetic alignment of SWCNTs decorated with Fe3O4 to enhance mechanical properties of SC-15 epoxy
Title
Magnetic alignment of SWCNTs decorated with Fe3O4 to enhance mechanical properties of SC-15 epoxy.
Creator
Malkina, Olga, Mahfuz, Hassan, Sorge, Korey D., Rondinone, A., Chen, Jihua, More, K., Reeves, S., Rangari, V. K.
Date Issued
2013-04
PURL
http://purl.flvc.org/fau/fd/FAUIR000170
Format
Citation