A novel composite material consisting of calcium-deficient hydroxyapatite biomimetically deposited in a bacterial cellulose hydrogel may aid bone substitution and regeneration.
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Research Interests:
... Publication: Materials for Space Applications, edited by Mircea Chipara, David L. Edwards, Roberto S. Benson and Shawn Phillips. Materials Research Society Symposium Proceedings volume 851. Symposium held November 29-December 3, 2004,... more
... Publication: Materials for Space Applications, edited by Mircea Chipara, David L. Edwards, Roberto S. Benson and Shawn Phillips. Materials Research Society Symposium Proceedings volume 851. Symposium held November 29-December 3, 2004, in Boston, MA USA. ...
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ABSTRACT The development of synthetic materials with inherent bone properties would allow the safe restoration of bone function and reduce current risks associated with the use of grafts. This study investigated the development of... more
ABSTRACT The development of synthetic materials with inherent bone properties would allow the safe restoration of bone function and reduce current risks associated with the use of grafts. This study investigated the development of bacterial cellulose–hydroxyapatite composite (CdHA-BC) as a potential bone substitute material. Composites of bacterial cellulose (BC) and oxidized, degradable, cellulose (OBC) were mineralized by sequential incubation in calcium chloride and aqueous sodium phosphate to form a calcium deficient hydroxyapatite (CdHA). The CdHA produced in BC and OBC is similar in morphology and chemistry to the hydroxyapatite found in natural bone. The formation of CdHA is supported by XRD, and EDS results. The CdHA-BC and CdHA-OBC composites degrade in a simulated aqueous physiological environment.
The effect of proton irradiation dose on the morphology of ultra high molecular weight polyethylene (UHMWPE) was studied. The radiation dose was varied from 0.09402 to 0.87 Mrads. The thermal behavior of the irradiated samples was... more
The effect of proton irradiation dose on the morphology of ultra high molecular weight polyethylene (UHMWPE) was studied. The radiation dose was varied from 0.09402 to 0.87 Mrads. The thermal behavior of the irradiated samples was investigated by submission to two heating cycles. The proton irradiation produces morphological changes in the mole fraction of crystallizable units, sequence length distribution, and crystallite
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This study develops a connection between radiation integral dose, dose rate and crystallite thickness. Samples are irradiated at an integral dose of 75 and 150 kGy and at a dose rate of 0.25 and 2.9 kGy/h. The degree of crystallinity and... more
This study develops a connection between radiation integral dose, dose rate and crystallite thickness. Samples are irradiated at an integral dose of 75 and 150 kGy and at a dose rate of 0.25 and 2.9 kGy/h. The degree of crystallinity and lamellar thickness distributions are ...
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Research Interests:
ABSTRACT The structure, morphology and mechanical properties of polypropylene-nanoclay composites containing 1 to15 wt.% nanoclay was investigated. Combination of wide-angle x-ray diffraction (WAXD) and transmission electron microscopy... more
ABSTRACT The structure, morphology and mechanical properties of polypropylene-nanoclay composites containing 1 to15 wt.% nanoclay was investigated. Combination of wide-angle x-ray diffraction (WAXD) and transmission electron microscopy (TEM) was used to determine nanocomposite morphology. Mixture of intercalated and exfoliated morphology was observed for all the samples. Samples with 1 to 5 wt.% clay showed shear induced orientation of clay platelets in the surface region of the molded bars. Glass transition temperature slightly decreased due to the plasticizing effect of additives. At higher weight percentage reinforcement (10–15 wt.%), up to 67 % improvement in tensile modulus is observed. Breaking energy was significantly improved for samples with up to 2 wt.% nanoclay additives. With further increase in nanoclay weight percentage, failure mode shifted from ductile to brittle. Increase in exclusion of clay additives at the boundary of spherulites and segregation of clay platelets were observed for samples with higher weight percentage of clay additives. FigureThe structure, morphology and mechanical properties of polypropylene-nanoclay composites with 1 to 15 wt.% nanoclay additives were investigated. Mixture of intercalated and exfoliated morphology was observed in nanocomposites. At higher weight percentage reinforcement (10–15 wt.%), up to 67 % improvement in tensile modulus is observed. At higher weight percentage, exclusion of clay additives at the boundary of spherulites was observed. This study illustrates that along with the thermodynamic driving force, spherulite formation also drives the ultimate morphology
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Research Interests: Electron Microscopy, Biomaterials, Biomimetics, Hydroxyapatite, FTIR spectroscopy, and 11 moreScanning Electron Microscopy, Hydrogels, Multidisciplinary, Cellulose, Composite Material, X ray diffraction, Fourier transform infrared spectroscopy, Bone Substitutes, Calcium Chloride, Durapatite, and Fourier transform infrared
Page 1. The Application of Fracture Mechanics to Radial Keratotomy Darnell C. Worley II and Roberto S. Benson The University of Tennessee at Knoxville Material Science and Engineering Department 420 Doughterty Engineering Bldg. Knoxville,... more
Page 1. The Application of Fracture Mechanics to Radial Keratotomy Darnell C. Worley II and Roberto S. Benson The University of Tennessee at Knoxville Material Science and Engineering Department 420 Doughterty Engineering Bldg. Knoxville, TN 37996-2200 ...
