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Preparation and characterization of fSWCNT/HAp-nylon hybridized composite biomaterial and mechanical testing
Title
Preparation and characterization of fSWCNT/HAp-nylon hybridized composite biomaterial and mechanical testing.
Creator
Khanal, Suraj P., Leventouri, Theodora, Graduate College
Abstract/Description
Synthetic hydroxyapatite HAp bears poor mechanical properties that limit its applicability in orthopedics. We study the possibility of overcoming such limitations by incorporating functionalized single walled carbon nanotube fSWCNT and polymerized є- caprolactam. Sonication method was used to disperse fSWCNT in the HAp. A simple hot blending method was used to incorporate HAp/fSWCNT powder with melted polymerized є-caprolactam. The fracture toughness of the composite material was tested in...
Show moreSynthetic hydroxyapatite HAp bears poor mechanical properties that limit its applicability in orthopedics. We study the possibility of overcoming such limitations by incorporating functionalized single walled carbon nanotube fSWCNT and polymerized є- caprolactam. Sonication method was used to disperse fSWCNT in the HAp. A simple hot blending method was used to incorporate HAp/fSWCNT powder with melted polymerized є-caprolactam. The fracture toughness of the composite material was tested in compliance with ASTM D-5045 standard. A critical stress intensity factor K1C of the composite material was found to be 3.55 MPa.m1/2, which is a value comparable to the one for cortical bone.
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Date Issued
2014
PURL
http://purl.flvc.org/fau/fd/FA00005828
Format
Document (PDF)
Evaluation of surface dose outside the treatment area for breast cancer irradiation modalities using thermoluminescence dosimeters (TLDs)
Title
Evaluation of surface dose outside the treatment area for breast cancer irradiation modalities using thermoluminescence dosimeters (TLDs).
Creator
Khanal, Suraj P., Ouhib, Zoubir, Leventouri, Theodora, Graduate College
Date Issued
2013-04-12
PURL
http://purl.flvc.org/fcla/dt/3361319
Subject Headings
Thermoluminescence dosimetry, Breast--Cancer--Treatment
Format
Document (PDF)
Effect of preparation temperature on crystal structure properties on nanophase Fe-substituted hydroxyapatite
Title
Effect of preparation temperature on crystal structure properties on nanophase Fe-substituted hydroxyapatite.
Creator
Kathriarachchi, Vindu, Kyriacou, Andreas, Khanal, Suraj P., Leventouri, Theodora, Graduate College
Date Issued
2012-03-30
PURL
http://purl.flvc.org/fcla/dt/3342385
Format
Document (PDF)
Crystal structure studies of cone snail shells by powder x-ray diffraction
Title
Crystal structure studies of cone snail shells by powder x-ray diffraction.
Creator
Khanal, Suraj P., Kathriarachchi, Vindu, Kyriacou, Andreas, Leventouri, Theodora, Graduate College
Date Issued
2011-04-08
PURL
http://purl.flvc.org/fcla/dt/3165805
Subject Headings
Snails, Shells, X-rays --Diffraction
Format
Document (PDF)
Evaluation of surface dose outside the treatment area for breast cancer irradiation modalities using thermoluminescence dosimeters (TLDs)
Title
Evaluation of surface dose outside the treatment area for breast cancer irradiation modalities using thermoluminescence dosimeters (TLDs).
Creator
Khanal, Suraj P., Charles E. Schmidt College of Science, Department of Physics
Abstract/Description
The purpose of this research is to compare the surface dose outside the treatment area for different breast cancer irradiation modalities using Thermoluminescence Dosimeters (TLDs). Five different modalities are included in this study: Accuboost, Photon boost, Electron boost, Strut-Adjusted Volume Implant (SAVI), and Mammosite Multi-lumen (ML).Six points of interest (POI) on the breast cancer patients had been selected for the TLDs placement. Data from 25 breast cancer patients at Lynn Cancer...
Show moreThe purpose of this research is to compare the surface dose outside the treatment area for different breast cancer irradiation modalities using Thermoluminescence Dosimeters (TLDs). Five different modalities are included in this study: Accuboost, Photon boost, Electron boost, Strut-Adjusted Volume Implant (SAVI), and Mammosite Multi-lumen (ML).Six points of interest (POI) on the breast cancer patients had been selected for the TLDs placement. Data from 25 breast cancer patients at Lynn Cancer Institute of the Boca Raton Regional Hospital were included in the study. The measured percentage ranges of the averaged doses at the six POIs for the different modalities are: Sternum 0.26% - 3.26%, Shoulder 0.33% - 2.79%, Eye 0.26% - 1.32%, Thyroid 0.20% - 2.75%, CLB 0.2% - 5.46%, Lower Abdomen 0.16% - 2.25%.
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Date Issued
2013
PURL
http://purl.flvc.org/fcla/dt/3362479
Subject Headings
Thermoluminescence, Therapeutic use, Radiation dosimetry, Breast, Cancer, Treatmernt, Radiation, Measurement, Methodology
Format
Document (PDF)
Improving the Mechanical Properties of Nano-Hydroxyapatite
Title
Improving the Mechanical Properties of Nano-Hydroxyapatite.
Creator
Khanal, Suraj P., Leventouri, Theodora, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Physics
Abstract/Description
Hydroxyapatite (HAp) is an ideal bioactive material that is used in orthopedics. Chemical composition and crystal structure properties of HAp are similar to the natural bone hence it promotes bone growth. However, its mechanical properties of synthetic HAp are not sufficient for major load-bearing bone replacement. The potential of improving the mechanical properties of synthetic hydroxyapatite (HAp) by incorporating carboxyl functionalized single walled carbon nanotubes (CfSWCNT) and...
Show moreHydroxyapatite (HAp) is an ideal bioactive material that is used in orthopedics. Chemical composition and crystal structure properties of HAp are similar to the natural bone hence it promotes bone growth. However, its mechanical properties of synthetic HAp are not sufficient for major load-bearing bone replacement. The potential of improving the mechanical properties of synthetic hydroxyapatite (HAp) by incorporating carboxyl functionalized single walled carbon nanotubes (CfSWCNT) and polymerized ɛ-caprolactam (nylon) is studied. The fracture toughness, tensile strength, Young’s modulus, stiffness and fracture energy were studied for a series of HAp samples with CfSWCNT concentrations varying from 0 to 1.5 wt. % without, and with nylon addition. X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Differential Scanning Calorimetry (DSC) were used to characterize the samples. The fracture toughness and tensile test was performed under the standard protocol of ASTM D5045 and ASTM D638-02a respectively. Reproducible maximum values of (3.60 ± 0.3) MPa.m1/2 for fracture toughness and 65.38 MPa for tensile strength were measured for samples containing 1 wt. % CfSWCNT and nylon. The Young’s modulus, stiffness and fracture energy of the samples are 10.65 GPa, 1482.12 N/mm, and 644 J/m2 respectively. These values are comparable to those of the cortical bone. Further increase of the CfSWCNT content results to a decreased fracture toughness and tensile strength and formation of a secondary phase.
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Date Issued
2016
PURL
http://purl.flvc.org/fau/fd/FA00004675, http://purl.flvc.org/fau/fd/FA00004675
Subject Headings
Biomedical engineering -- Materials, Biomedical materials -- Mechanical properties, Nanostructured materials -- Mechanical properties
Format
Document (PDF)