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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 97 for “"co-precipitation"”.
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Modification of soy-wheat protein functionality by co-precipitation and its extrusion performances
This investigation will compare the functional characteristics of native, co-precipitated and blended proteins. Experiments will be designed to better understand the mechanisms involved in the texture formation of the co-precipitated protein, and determine the most suitable conditions and …
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Adsorption and co-precipitation of heavy metals on hydrous ferric oxides (HFO) from acidic waters
… in acidic waters (pH = 3.8 — 5.8) and in coexisting hydrous ferric oxides (HFO). Samples were collected from two sites, McAdoo, PA (acid mine drainage, AMD) and the Wharton State Forest (WSF), NJ (naturally acidic region). At McAdoo, Fe, Ni, Cd, and Mn concentrations exceeded USEPA and …
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Production and characterization of composite nano/micro sized particles by rapid expansion of supercritical solutions (ress) co-precipitation
Nanoscale composites of hexahydro-1, 3, 5-trinitro-1, 3, 5-triazine (RDX) and polymer binders were produced by co-precipitation using rapid expansion of supercritical solutions (RESS). The binders used in this study are poly (vinylidene fluoride-co-hexafluoropropylene) (VDF-HFP22), polystyrene (PS) …
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Chemical processing of lead metatitanate by co-precipitation and sol-gel methods: The role of powder and gel characteristics on crystallization behavior
… PbTiO$\sb3$ by two chemical methods: (i) aqueous co-precipitation and (ii) organo-metallic sol-gel processing. The effects of chemical processing conditions on material properties were determined. Particular attention was paid to the evolution of structure on heat treatment, and crystallization. …
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Exploration of the mechanism of rhodium(III) co-precipitation with copper sulfide (at low rhodium concentrations) incorporating the cationic substitution reaction path
… into the mechanism and kinetics of Rh3+ coprecipitation with CuS upon aqueous thiosulphate addition to acidic base metal sulphate solutions, where Rh3+ concentration is two orders of magnitude lower than Cu2+, over 50 - 150 °C. The heterogeneous cationic substitution has been identified …
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Complexation between cyclodextrins and phenylurea herbicides in solution and in the solid state
… the preparation of cyclodextrin inclusion complexes of four phenylurea herbicides (metobromuron, monolinuron, monuron and fenuron) using the kneading and co-precipitation methods in the solid state while also determining complex formation of the same phenylureas in solution with selected …
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Supramolecular derivatives of selected bioactive compounds : a physicochemical study
… to prepare new solid phases of three bioactive compounds: the steroidal anticancer agent 2-methoxyestradiol [polymorphs and cyclodextrin (CD) inclusion complexes], its derivative 2-methoxyestradiol-bis-sulfamate (polymorphs), and the antiretroviral agent, nevirapine (co-crystals). The solubility …
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Fabrication and electrochemical performance analysis of nanocomposite for low-temperature SOFC
… fuel cell (LTSOFC) offers a promising new energy conversion technology, which converts chemical energy into electrical energy. The benefits of LTSOFC technology include a low operating temperature, relatively high energy conversion efficiency, and potentially low costs. One of the key challenges …
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Nanocrystalline perovskites for catalytic combustion and oxygen separation
… surface area and smaller grain size by chemical co-precipitation compared to solid-state and complexation/combustion synthesis routes. The choice of solvent, base and suspension pH in co-precipitation was found to strongly affect the chemical stoichiometry of the resulting material. …
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Experimental validation of the predicted emergent magnetism in diamagnetic cadmium sulfide (Cds) doped with boron
The large and persistent photoconductivity displayed by some semiconductors provides a way to control magnetism with light, through illumination-control of free carrier concentration and thereby magnetic interaction in dilute magnetic semiconductors. CdS is a wide band-gap semiconductor that …
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EFFECTS OF GROUND-WATER FLOW ON SOIL CHEMISTRY, NUTRIENT AVAILABILITY AND PLANT SPECIES DISTRIBUTIONS IN FOUR NEW YORK STATE FENS
Occurrence of distinctive plant communities, rich fens, in specific hydrogeologic settings with high fluxes of calcium-rich ground water has been observed but not fully explained. In fens, ground-water discharge patterns induce spatial gradients in water chemistry that may determine vegetation …
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APPLICATION OF LAYERED DOUBLE HYDROXIDES IN SOLID-PHASE EXTRACTION
… laborious operations. Nevertheless, there remain considerable innovations that SPE can offer. This thesis attempts to apply one of these innovations, dissolvable sorbents, layered double hydroxides (LDHs) and their derivants (e.g., layered double oxide (LDO), Fe3O4@LDO, Fe3O4@LDH, (EDTA-Ni)-LDH), …
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Advanced Characterization for Studying Ni-rich Cathode Materials for Li-ion Batteries
… are energy storage devices which are able to convert chemical energy into electrical energy. Due to the recent excessive consumption of fossil fuels resulted in the uncontrolled release of carbon dioxide and significant amounts of greenhouse gases into the atmosphere, the need for sustainable …
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Kinetic studies of ethane dehydrogenation using carbon dioxide as mild oxidant over gallium aluminum mixed oxide
… studied in this work. We identified an optimized composition of the mixed oxide prepared via the co- precipitation method at a surface Ga/Al ratio of 0.1 and conducted a series of kinetic measurements on different surface Ga loadings. The kinetic parameters are found to be sensitive to the surface …
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A column experiment for groundwater remediation post-mine closure at the Wolverine Mine, Yukon
… semi-passive treatment system for remediation of contaminated groundwater with elevated dissolved metal concentrations, including selenium and sulphate, at the Wolverine Mine, Yukon. Laboratory up-flow columns were used to treat simulated mine impacted waters. Five columns were filled with varying …
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THE STUDY OF THE DISSOLVED NITROGEN CONTAINING MACROMOLECULES IN THE MARINE ENVIRONMENT
… for the direct determination of the dissolved combined amino acid (DCAA) content of seawater involving the acid hydrolysis of seawater under specified conditions, followed by the determination of the amino acids by reverse phase liquid chromatography (RPLC). No preconcentration or …
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Potential commercial application of a bi-layer bone-ligament regeneration scaffold to anterior cruciate ligament replacement
… model was created in order to explore the commercial application of a bi-layer bone-ligament scaffold to the treatment of torn anterior cruciate ligaments (ACL) requiring replacement. The two main keys in producing the bone scaffold are triple co-precipitation of type-I collagen, …
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Determination of radium-226 in drinking water by alpha spectroscopy
… water was developed. The method involves concentrating radium by coprecipitation with barium sulfate; separating radium from barium and other alkaline earth metals by ion exchange; and electrodepositing radium onto stainless steel disc for radioactivity counting. The procedure requires the …
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Examination of Silica Removal with Solids Recycle for Reverse Osmosis Pretreatment
Water treatment methods serve to remove harmful constituents from ground and surface waters prior to municipal distribution by exploiting the physical and chemical properties of those constituents. Properties can include size, charge, or solubility. Silica (SiO2) is difficult to remove during water …
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Development of bi-layer mineralized bone and cartilage regeneration template
Porous collagen-glycosaminoglycan (CG) scaffolds have been studied extensively and proven to be capable of tissue regeneration in vivo for applications including skin regeneration templates, hollow nerve guides and conjunctiva regeneration. While the current CG scaffold has been thoroughly examined …
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