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 94 for “"Nano-Particles"”.
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The sintering and stability of catalytic nano-particles
… rates of emission to sintering (instability of nanoparticles). It was found that the rates of emission did not fully reflect vapor phase transport (direct evaporation). The particle-support interaction was increasing the rate of evaporation leading to the belief that adatom diffusion, caused by …
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Effect of silicon nano particles added to the polymeric coatings
… of a coatingto the same coating with added nano silica. The sample coating for this project was bis-ureasil which was synthesized using 1:1 equivalent ratio of bis (3-trimethoxysilyl-propyl) amine (BTMSPA) (318.0g) and IPDI (52.0g) in 400g of anhydrous THF. The other coating was prepared by …
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Modified Release of Agglomerated Nano-Particles for Pulmonary Drug Delivery
The delivery of nanoparticulate medicines to the lungs via the pulmonary route presents many challenges. Nanoparticles tend to lack sufficient mass and are principally exhaled and not deposited in the lungs. However, they also tend to form aggregates or agglomerates to reduce the free energy of the …
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Investigating the biological effects of (nano)particles in Alzheimer’s disease pathologies
… and environmental factors. Magnetite pollutant particles have been found in abundance in brains of people with AD in densely populated cities. This observation highlighted the need for increased understanding of the potential impact on human health. Therefore, chapter 3 commenced an extensive …
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Self-assembly of ferromagnetic micro/nano-particles with perpendicular magnetic anisotropy
Magnetic particles offer an interesting platform for self-assembly, as their dipolar interactions and response to magnetic fields can be used to drive and manipulate assembly. Many magnetic particles used so far in these applications are quite simple in their properties, such as iron oxide …
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Effect of Non-Ionic Surfactants and Nano-Particles on the Stability of Foams
… be attributed to the charge-charge interaction. Nano-sized silica and poly methyl methacrylate (PMMA) particles were used as solid surfactants to stabilize foams. It was found that the foam stability was maximum at contact angles just below 90o. The TFPB studies conducted with silica …
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Microstructure and Electronic Structures of Er-Doped Si Nano-particles Synthesized by Vapor Phase Pyrolysis
Si nanoparticles are new prospective optoelectronic materials. Unlike bulk Si cry-stals, Si nanoparticles display intriguing room-temperature photoluminescence. A major challenge in the fabrication of Si nanoparticles is the control of their size distribution. The rare-earth element Er has unique …
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Electroplated composite coatings with incorporated nano particles for tribological systems with the focus on water lubrication
… the feasibility of the electrodeposited Ni–based nanocomposite coatings for water-lubricated tribological systems. The tribological behaviour of newly developed nanocomposite coatings is assessed under immersed water lubrication. For this reason test rig modification is deployed, to allow …
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Growth mechanisms of carbon nano-fibers, -tubes, and graphene on metal oxide nano-particles and -wires
Carbon nanostructures (CNS) such as carbon nano-fibers (CNFs), -tubes (CNTs), and graphene are of interest for a diverse set of applications. Currently, these CNS are synthesized primarily by chemical vapor deposition (CVD) techniques, using metal catalysts. However, after CNS synthesis, those …
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Investigating the therapeutic effects of silver and gold nano particles capped with selected medicinal plants against tuberculosis
… the biological activities of silver and gold nanoparticles capped with selected medicinal plant extracts against Mycobacterium tuberculosis. Methodology: P. africanum and Z. mucronata barks and leaves were collected in the Vhembe district of Limpopo. Plant phytochemical constituents were …
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Swelling-Etching Characterization of Copper (I) Oxide - PDMS for the Development of Micro/Nano - Particles Composite MEMS Corrosion Sensor
… of the device is composed of copper (I) oxide particles mixed in some polydimethylsiloxane (PDMS). The PDMS, “housing,” is meant for controlling the oxidation rate through the sensing material. A solvent was used to facilitate the etchant diffusion through the PDMS matrix. Toluene and acetic …
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An evaluation of novel lipid-enveloped nanoparticles for adjuvant and antigen delivery for an HIV vaccine : stepping from laboratory into potential markets
… Irvine's group. Lipid-enveloped virion-sized nano-particles with a biodegradable polymer core are used as synthetic pathogens to deliver HIV specific antigens and adjuvants. The nano-particles are designed to display multiple copies of the antigen on their surfaces and to elicit humoral …
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Modelling and computational analysis of heat-transfer in multi-geometry and multi-phase flow of Newtonian and non-Newtonian fluids in pipes and channels
… Newtonian fluids, Newtonian-Fluid-Based- Nanofluids, and non-Newtonian fluids are all considered in the thesis. The Newtonian-Fluid-Based Nanofluids (NFBN) are designed from the homogeneous mixing of a Newtonian base-fluid with solid nano-particles. Water will be used as the Newtonian …
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Synthesis of polymeric nanocomposites in supercritical carbon dioxide
… of poly (methyl methacrylate) (PMMA)/silica nanocomposites with different surfactant and filler concentrations synthesized through in-situ polymerization in supercritical carbon dioxide were investigated. In addition, ferromagnetic nano-particles were synthesized and functionalized for the …
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In-Situ Studies of Copper Nanoparticles Using a Novel Tandem Ultra-High Vacuum Particle Production Chamber Transmission Electron Microscope
Nanophase materials, a compaction of nano-particles, are arguably a new phase of matter whose high grain-boundary-to-volume ratio leads to new and enhanced material properties. Previously, these materials have been difficult to study because of their sensitivity to contaminating atmospheres. We …
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The Effect Of Colloidal Stability On The Heat Transfer Characteristics Of Nanosilica Dispersed Fluids
Addition of nano particles to cooling fluids has shown marked improvement in the heat transfer capabilities. Nanofluids, liquids that contain dispersed nanoparticles, are an emerging class of fluids that have great potential in many applications. There is a need to understand the fundamental …
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Incorporation of Carbon Nanoparticles in Polyaryletherketone Matrices for High Performance Liquid Chromatography Applications
… In this study, the effects of adding carbon nano particles at a 1% weight loading to 30% carbon fiber loaded PAEK plastics via a simple melt blending process were explored and compared to neat PAEK blends. Experimental blends were tested for their Young’s modulus, relaxation under sustained …
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Dispersionen für den Korrosionsschutz von Aluminium
… substituted monomer we obtain polymeric nano-particles with phosphate groups on the surface. In a first step cross-linked butyl acrylate/styrene particles were formed. In a second step a mixture of functionalised acrylate and butyl acrylate/styrene was added to the system. In this way, …
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DESIGN AND FABRICATION OF METAL-POLYMER BASED CORE-SHELL ARTIFICIAL NANODIELECTRICS FOR CAPACITOR APPLICATIONS
… by introducing either ceramic or metal nano fillers. Usage of ceramic fillers would need higher loading, leading to less flexibility and compatibility with printed circuit boards. Thus metal nano fillers can be used effectively to enhance the dielectric properties. My thesis work …
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Composite Gel Polymer Electrolyte for Lithium Ion Batteries
… agent, mixture of charge modified TiO2 and SiO2 nano particles as ionic conductors, and LiClO<sub>4</sub>+LiPF<sub>6</sub> as lithium salts were fabricated. CGPE was coated on an O2-plasma treated trilayer polypropylenepolyethylene- polypropylene (PP) membrane separator using solution casting …
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