Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Nanofibres"”.
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Shear-Spun Polymer Nanofibres For Water Purification
… a solution to this issue in the form of polymer nanofibres, a material that was hitherto prohibitively expensive. The studies presented in this thesis explored a novel method of synthesising polymer nanofibres that is capable of large-scale manufacture (done entirely using low-cost materials), …
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Size-dependent mechanical properties of single polyurethane nanofibres
… in diameter and meters in length. These nanofibres are then collected onto a target to create a non-woven, fibrous structure of variable fibre diameter and morphology. These electrospun nanofibre mats have a broad range of applications including being used as chemical sensors, filtration, …
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Synthesis, characterisation and properties of tantalum based inorganic nanofibres
… High aspect ratio tantalum disulfide, TaS2 nanofibres were prepared from a 1:2 stoichiometric mixture of elemental powders in a one-step synthesis utilising silica ampoules. A surface assisted growth phenomena was investigated and found to significantly increase the yield, both in quality …
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Optical micro- and nanofibres: Higher mode generation and particle manipulation studies
… produces high-quality, single-mode, micro- or nanofibres when tapered in a flame-heated, pulling rig in the laboratory. Single mode fibre can also support higher transverse modes, when transmitting wavelengths below that of their defined single-mode regime cut-off. To investigate this, a …
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Isolation of Cellulose Nanofibres: Elucidation of a Novel Approach Utilizing Fungal Pretreatment
… Isolation and application of cellulose nanofibres is expanding rapidly due to their environmental benefits and specific strength properties, especially in nano-biocomposite area. Currently, cellulose nanofibres are isolated from natural fibres through a combination of high energy …
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Advanced oxidative water treatment process using an electrohydraulic discharge reactor and TiO2 immobilised on nanofibres
The aim of this study was to design and build an electrohydraulic discharge reactor in such a way that the synthetic immobilized TiO2 nanophotocatalytic components could be integrated, for the production of active species such as OH radicals, ozone and hydrogen peroxide, as a cocktail to clean …
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Enhancement of bioactive glass biocompatibility by deposition of titanium nanofibres generated by the High Intensity Laser Induced Reverse Transfer Method (HILIRT)
A literature review was done in order to understand the structure and properties of the surface of bioactive glass and how to make this structure biocompatible with the human body. In this research, glass biocompatibility was increased using a deposition method called high intensity laser induced …
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An investigation on the effect of solution concentration, applied voltage and collection distance on electrospun fibres of PVA solutions
… the fibre diameter and morphology of electrospun nanofibres. PVA solutions of 4%, 6% and 8% of mass percentage were used. The diameter and morphology of nanofibres formed were analysed under the Environmental Scanning Environmental Microscope (ESEM). The deposition rate and area were also …
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Dry-transfer of chemical vapour deposited nanocarbon thin films
… on CVD Fe and Ni catalysed carbon nanotubes and nanofibres on indium tin oxide, aluminium and alumina diffusion barriers. Activations energies of 0.5 and 1.5 eV were extracted supporting surface diffusion limited catalysis for CNTs and CNFs. For the first time an activation energy of 2.4 eV has …
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Synthesis of 6-Deoxy-6-Amino Chitosan and applications thereof
… with poly(ethylene oxide) and the resulting nanofibres were subsequently coated with silver nanoparticles which improved antimicrobial applications. Nanoparticles were produced using 6-deoxy-6-amino chitosan as the reducing and capping agent. The antimicrobial activity of these silver coated …
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Synthesis and characterization of nanostructured catalysts for photovoltaic applications
… Based on these preliminary results, the nanofibres prepared in heptane performed the best, with good dye loading, electron lifetime and diffusion coefficient. The addition of a scattering layer using hierarchical spheres showed promising results in decreased transparency and increased …
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Novel functionalised biodegradable polymeric micro- and nano-structures for tissue engineering and drug delivery applications
… blocks, POEGMA and PMPC on the surface of the nanofibres was determined. The conjugation of the cell-adhesive RGDC peptide to the benzaldehyde functional groups of nanofibres consisting of benzaldehyde-functionalised PLA-b-PMPC and PLA-b-POEGMA copolymers in a 1:1 molar ratio was investigated. …
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A tissue-engineered approach to hernia repair
… utilises electric forces to create micro- and nanofibres, was used to fabricate a new-generation of hernia mesh (drug-loaded polymeric mesh). Solutions of polycaprolactone (PCL) or polylactic acid (PLA), two aliphatic polymers commonly used in various clinical applications, were individually …
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Preparation, Characterization and In Vitro Evaluation of Metformin Loaded Hyaluronic Acid Nanoparticles for Oral Delivery
… revealed that the nanostructures were in form of nanofibres. Zeta potential was found to be in the range of -0.27 to 0.24 mV. Physical stability studies indicated that the particle size was maintained at < 200 nm, and no change in zeta potential values over a period of 65 days. Differential …
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Phase selective flame-retardant laminates
… laminates using three configurations: cellulose nanofibres CNF/clay nanocomposite papers, commercial intumescent coatings based on expandable graphite, and vermiculite-based nonwoven mats. These coatings delayed the onset of mechanical failure under fire by acting as thermal barriers, reducing …
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Polymer Crystallization: Micro- and Nano- Filler Effects on Isotactic Polypropylene
… fibres) and nano- (montmorillonites, carbon nanofibres and carbon nanotubes) fillers were added. In order to keep the same matrix, the micro- and nano- composites were prepared by in-creasing the filler loading at a fixed iPP/PP-MA ratio (13.2). Structural characterization was carried out by …
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Multi-scale effects on deformation mechanisms of polymer nanocomposites : experimental characterisation and numerical study
… 5 wt%) such as nanoclay, carbon nanotubes or nanofibres into a plastic resin to dramatically enhance its stiffness, strength and thermal properties. The difference between nanocomposites and conventional fibre composites is that the added fillers are extremely small, only one-millionth of a …
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Durability of cement and concrete matrices incorporating nanocellulose fibers (NCF)
L'introduction des nanofibres de cellulose (NFC) représente une avancée significative dans le domaine des matériaux de construction, offrant des propriétés mécaniques, une durabilité et une rentabilité supérieures par rapport aux fibres traditionnelles. Face aux inquiétudes concernant la durabilité …
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Improvement of Cathode Material for Solid Oxide Fuel Cell through Surface Infiltration and Electrospinning
… needle and the collector, the method of creating nanofibres has been researched and perfected. By coating the electrolyte with uniform CGO fibres covered with LSCF nanoparticles, a cathode was created. The fibrous cathode demonstrated much reduced ASR (about 5 times smaller) than the powder-formed …
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