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Showing 1 to 20 of 61 for “"aqueous systems"”.
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Magnetite Oxidation in Aqueous Systems
… in situ remediation of contaminated groundwater systems due to its oxidation/reduction potential for reduction of contaminants such as carbon tetrachloride. Little characterization and analysis has been done to describe the kinetics of magnetite transformation during oxidation. This work focuses …
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Removal of organic contaminants from aqueous systems
… paracetamol (PCT) and hydroquinone (HQ)) from aqueous systems. For NB, this study focusses on removal via both iron reduction and adsorption, while removal of the other three compounds is focussed purely on adsorption. The results demonstrate NB degradation using iron powder produces AN, with …
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The Dynamical Behavior of Confined Aqueous Systems
… of artificial tear films (polyvinyl alcohol aqueous solutions) and synovial fluids was of scientific importance for future medical ramifications. The effects of chemical additives, ionic strength and adjoining surface chemistry on the static and dynamic interactions of confined polymer …
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Characterization of C60 Nanoparticles in Aqueous Systems
… aggregates of C60 fullerene are stable in aqueous environments has elicited concerns regarding the potential environmental and health effects of these aggregates. Although many previous studies have used aggregates synthesized using intermediate organic solvents, this work primarily …
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Valorization of wastewater-derived biomass via integrated aqueous systems
… compounds, and focus on developing integrated aqueous systems for conversion of wastewater-derived biomass into valuable products. The elimination of drying steps and reduction in solvent use make these processes ideal for processing wastewater-derived biomass, thereby enabling the simultaneous …
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Rheological Investigations of Latex-Surfactant-Associative Thickener Aqueous Systems
… and the dry paint film. In this work, quaternary systems of Water-Latex-Thickener-Surfactant were investigated to further the understanding of their behavior in coatings. The thickener used was a well characterized, hydrophobically-modified, ethoxylated urethane (HEUR) with two C18 terminal …
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The Effects of High Energy Radiation on Non-Aqueous Systems
Made available in DSpace on 2014-12-05T19:35:48Z (GMT). No. of bitstreams: 1 0007829.pdf: 5225290 bytes, checksum: ee452e6fd7456af4945079f1db50ee11 (MD5) Previous issue date: 1954
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Competitive Adsorption of Organic Compounds From Aqueous Systems Using Active-Carbon
Made available in DSpace on 2014-12-17T21:05:00Z (GMT). No. of bitstreams: 1 7317259.pdf: 3526198 bytes, checksum: 68c2e150425de9c7c401dfac0c90d7cf (MD5) Previous issue date: 1972
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Aqueous systems from first-principles : structure, dynamics and electron-transfer reactions
In this thesis, we show for the first time how it is possible to calculated fully from first-principles the diabatic free-energy surfaces of electron-transfer reactions. The excitation energy corresponding to the transfer of an electron at any given ionic configuration (the Marcus energy gap) is …
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Photochemical transformation of particulate organic carbon and its impact on mercury cycling in aqueous systems
… dissolved organic carbon (DOC), an important aqueous constituent that alters the reactivity and fate of Hg primarily through complexation with carboxyl and reduced sulfur (e.g. sulfhydryl) groups. However, less is understood of Hg reactions with particulate organic matter (POM), an important …
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The Removal and Recovery of Oxo-Anions from Aqueous Systems using Nano-Porous Silica Polyamine Composites
… lead and mercury are frequently detected in aqueous wastes. Arsenic and selenium are highly toxic elements to human health and the environment. The Maximum Contaminant Level (MCL) for both these toxic metals continue to become more and more stringent. Although there are several metal …
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The Removal and Recovery of Oxo-Anions from Aqueous Systems using Nano-Porous Silica Polyamine Composites
… lead and mercury are frequently detected in aqueous wastes. Arsenic and selenium are highly toxic elements to human health and the environment. The Maximum Contaminant Level (MCL) for both these toxic metals continue to become more and more stringent. Although there are several metal …
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Effect of Nitroxides and Molecular Oxygen on Proton Relaxation Rates in Aqueous Systems and in Lipids
… of these species on proton relaxation in both aqueous systems and in lipids is studied. The basic experimental approach for this study is the measurement of proton longitudinal relaxation rates (1/T$\sb1$) over a broad range of magnetic field strengths (corresponding to proton Larmor …
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Antimony isotopes as indicators of redox reactions in aqueous systems: fractionation during Sb(V) reduction by sulfide and isotope exchange kinetics between dissolved Sb(III) and Sb(V)
… (Sb) has a history of being overlooked as an aqueous contaminant. The widespread commercial use of Sb has caused scientists to realize the importance of studying the fate and transport of Sb. For other contaminant elements, stable isotopic ratio measurements have been useful for source tracing …
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Theoretical Approaches to the Characterization of Water, Aqueous Interfaces, and Improved Sampling of Protein Conformational Changes
… to advance the understanding of water and other aqueous systems are devel- oped. This work falls into three areas: The creation of better interaction potentials for water, improved methods for sampling configurational space, and the applications of these methods to understand systems of interest. …
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Structural studies of imidazolium and phosphonium cations with aprotic hetero cyclic anions (AHAs) and investigation of electrochemical CO₂ reduction
… which were observed in the corresponding systems of neat ILs. Then, we have investigated the role of different CO₂ complexes on electrochemical CO₂ reduction. We found that cation-CO₂ complexes with imidazolium ILs did not improve electrochemical CO₂ reduction in non-aqueous systems. Also, …
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A MODEL SYSTEM FOR THE CONCENTRATION OF REOVIRUS FROM AQUEOUS ENVIRONMENTS
… for the routine isolation of reovirus from model aqueous systems was developed. Reovirus was found to be stable within a pH range of 3 to 10, with a minimum loss of viability. A slight hydrogen ion excess minimized virus aggregation phenomena and promoted efficient adsorption of virus to filter …
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Optical Characterization of Ultrasmall, Hydrogen -Terminated and Carboxyl -Functionalized Silicon Nanoparticles in Aqueous Environments
… potential for use as a luminescent marker in aqueous systems. First, they are shown to be ultrasmall, with a diameter of ∼1 nm, comparable to that of common organic fluorophores. Second, they are shown to have narrow PL in the near-UV with a nearly-symmetric lineshape and a FWHM as small …
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I. Persistent radicals for dynamic nuclear polarization : II. Synthesis of substituted indoles
… properties of BDPA and expand its application to aqueous systems is described. The narrow line radical applications in magnetic resonance spectroscopic imaging (MRSI) are investigated focusing on thermal mixing (TM) DNP of pyruvic acid. Design considerations and efforts toward the synthesis of bi- …
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