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 25 for “"iron nanoparticles"”.
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Interactions of molybdenum and vanadium with iron nanoparticles
Molybdenum, vanadium and iron are important micro and macro nutrients, respectively, for all living organisms. Their cycles and budgets in the natural environment is affected by - and affects many different processes. Poorly ordered ferrihydrite nanoparticles characterised for their particle size …
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Iron nanoparticles and zirconium metal-organic frameworks for therapeutic application
… pertaining to the synthesis of magnetic nanoparticles (NPs) and metal-organic frameworks (MOFs) targeted at biomedical applications. Chapter 1 introduces the theoretical grounding for the present work and describes the ideas which were used to inform the direction of the project. …
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Strengthening porous metal skeletons by metal deposition from a nanoparticle dispersion
… a metal from a suspension of nanometer-scale iron particles. The nanoparticle deposits from the suspension concentrate in regions of high stress when the solvent is removed by drying. The particles are sintered to create a dense structure that reinforces the porous skeleton-reducing …
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Use of polymeric membranes for the treatment of oily wastewater: Modification using inorganic nanoparticles and optimization of filtration parameters
… different additives. Introduced as additives, nanoparticles are capable of enhancing membrane performance via their intrinsic properties which include morphology, core size, and chemical nature. Nevertheless, common problems, such as nanoparticle agglomeration or leaching and the formation of …
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Synthesis and Investigation of Nanomaterials by Homogeneous Nonaqueous Solution Phase Reactions
… several kinds of nanomaterials in different environments and structure, including spherical nanoparticles, nanowires and core-shell structure composites We first synthesized metallic nanomaterials in this system, such as ~10 nm Fe nanoparticles, ~6 nm Au nanoparticles, and ~100 nm Bi …
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Controlled multi-step purification of single-walled carbon nanotubes
… purification method has been developed to remove iron impurity and non-nanotube carbon materials from raw single-walled carbon nanotubes produced in the HiPco (high pressure CO) process. In this study, iron nanoparticles, coated by carbon, are exposed and oxidized by multiple step oxidation at …
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Degradation of groundwater contaminants by iron containing systems.
Iron-containing systems are effective at reducing common groundwater contaminants. Zero-valent iron particles are an effective remediation technology for groundwater contaminated with halogenated organic compounds. Iron salts were used to generate iron oxide nanoparticles, which were reduced to …
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Synthesis And Polymerization Of Bifunctional Five-membered Cyclic Dithiocarbonates And Their Use As Stabilizers For Magnetic Nan
… method was used to synthesize the magnetic iron nanoparticles. The stabilized magnetic nanoparticles were characterized by transmission electron microscopy (TEM) to determine the shape and the size of the nanoparticles. Energy dispersive spectroscopy (EDS) was used to analyze the composition …
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Arsenic mobilization through bioreduction of iron oxide nanoparticles
… the oxidation of organic carbon. When ferric iron is reduced to ferrous iron, arsenic is mobilized into groundwater. Although this process has been documented in a variety of pristine and contaminated environments, minimal information exists on the mechanisms causing this arsenic mobilization. …
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Biological Agent Sensing Integrated Circuit (BASIC): A New Complementary Metal-oxide-semiconductor (CMOS) Magnetic Biosensor System
… both in specimens and especially in the environment. The sensor uses an electromagnetic detection mechanism to measure changes in the number of microorganisms--tagged by iron nanoparticles--that are placed on the surface of an integrated circuit (IC) chip. Measured magnetic effects are …
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Synthesis and characterisation of silica adsorption platforms for use in environmental remediation
… sorbents. Moreover, adsorbents containing silica nanoparticles with different porosity parameters were synthesized and evaluated for Cr (VI) uptake. The adsorption mechanism was defined by a two step adsorption mechanism for AP-MCM-41 while other sorbent exhibited a fast one step adsorption …
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Investigations of carbon nanotube catalyst morphology and behavior with transmission electron microscopy
… growth procedures. Ostwald ripening studies on iron nanoparticles are performed in an attempt to link catalyst morphology during growth and CNT chirality (the structure aspect of a nanotube that determines its electrical properties). These results suggest that inert gas dynamics play a critical …
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The Optimization of Gold Coated Iron Nanoparticle Synthesis Methods
… best-suited method for synthesizing gold-coated iron nanoparticles. The gold coating provides a means to functionalize the nanoparticle for use in a large variety of biosensors, and the magnetic nature of the particles allow for concentration of analytes in a sample, which improves inherent …
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Continuous synthesis of iron and aluminium-based nanoparticles
Nanoparticles exhibit exceptional properties (enhanced catalytic activity, magnetic or plasmonic properties) compared to their bulk counterparts, owing to their small dimensions. Thus, plenty of new and exciting applications leveraging these properties have been proposed, such as drug delivery, MRI …
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Analytical Methods and Devices for Bioenergy and Global Change Science
… improving the methods for obtaining data from environmental samples to set appropriate dosing levels. First, I developed a device which maps microalgae growth as a function of light and nutrients using a hydrogel-based concentration gradient generator to address experimental throughput in the …
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Effects of Microbial Community Stress Response and Emerging Contaminants on Wastewater Treatment Plants
… and evaluates the impact of engineered nanoparticles on activated sludge microbial communities and other emerging pollutants, such as antibiotic resistance genes and disinfection by-products. In order to assess microbial community dynamics of the response of nitrifying microorganisms to …
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Characterization of Metallic Flavor in Drinking Water: An Interdisciplinary Exploration through Sensory Science, Medicine, Health, and the Environment
… of sensory science, medicine, health, and the environment. Humans interact with their environment through the five senses and are often exposed to contaminants through multiple routes; oral intake of trace metal contaminants through drinking water is a likely source. The biochemical mechanism by …
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Green synthesis and characterisation of metal-based nanoparticles using Kombucha tea SCOBY yeast-based bioflocculant and their application in wastewater treatment
… bioflocculants during growth, offering safer, environmentally friendly alternative to chemical flocculants. This study focuses on a bioflocculant from a yeast strain in Kombucha tea SCOBY, highlighting its production, characterization, and application. Additionally, the bioflocculant explored as a …
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Ultrasound-assisted synthesis and processing of carbon materials
… and metal impregnation. In this work, iron-impregnated porous carbon microspheres (Fe-C) were prepared by a one-step USP process by incorporating both the carbon and metal sources into the precursor solution. Carbonization, pore formation, metal impregnation, and metal activation …
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Removal of nitrate from contaminated groundwater by floating alginate beads
… in groundwater, is a common and serious environmental problem that remains largely unsolved despite intensive research efforts. Major risks posed by dissolved nitrate in water are two-fold: (a) it is hazardous to human health, and (b) it contributes to eutrophication. Many environmental …
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