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 14 of 14 for “"solution conductivity"”.
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Theory, Fabrication and Characterization of Micromachined Electrolytic Solution Conductivity Sensors
… on the sensor tip, temperature correction for conductivity can be made so that concentration could be measured locally in media with non-uniform temperature and concentration distributions. Finally, challenges to reduce the microprobe tip size further are discussed with respect to fabrication, …
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Non-thermal plasma for water treatment
… OH radical and H2O2 production, and solution conductivity and pH variation were investigated and compared under different experimental conditions. The degradation of methylene blue dye was investigated under DBD.;The transition of impulsive current discharges into impulsive-diffuse …
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Electrochemically generating electric field gradients in the absence of buffer for membrane-free separations
… blue and concomitant ion intercalation from solution selectively formed an ion depletion zone and corresponding electric field gradient. This electric field gradient proved useful for the separation and enrichment of a charged fluorophore in solution, representing the first step towards …
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The precipitation of uniform silica particles through the controlled hydrolysis of silicon alkoxides
… of hydrolyzed alkoxide concentrations based on solution conductivity suggest that the soluble silica concentration is above that required for nucleation until late in the reaction. These results are consistent with a particle growth mechanism whereby reactions occurring in solution proceed …
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A microfabricated dielectrophoretic micro-organism concentrator
… and be robust to particulates and variations in solution conductivity. The concentrator is an active filter, which concentrate bacteria in solution using negative dielectrophoresis, which pushes objects away from the electrodes toward field minima. An electric field barrier is set up to guide …
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One Dimensional Approach to Modeling Damage Evolution in Galvanic Corrosion
… of this thesis is to detail the formulation and solution of the 1D model for basic cartesian and cylindrical configurations. The cartesian model defines a rectangular domain, while the cylindrical model defines a system of concentric disks. For each model a thin film approximation for the …
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Development and characterization of conducting polymer actuators
… to demonstrate the effect of temperature and solution conductivity on actuation and to develop methods that can be used to improve polymer actuator performance. Efficient techniques to incorporate functionalized carbon nanotubes into conducting polymers using layer by layer deposition and drop …
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Using electrochemical impedance spectroscopy to characterize vertically-aligned carbon nanotube forest porosimetry
… as their high tensile strength, high thermal conductivity, and unique semiconductor properties. Vertically-aligned carbon nanotubes (VA-CNTs) have been used in applications for electrochemical systems in energy storage systems and desalination systems. Typical methods of characterizing the …
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Ionic liquid electrochemical processing of reactive metals
… thermally stable. The density, viscosity and conductivity of the phosphonium ILs and metal salt-IL mixtures were measured. The conductivity of the phosphonium ILs tested were found to be roughly an order of magnitude lower than imidazolium ILs; this is attributed to the relatively large cation …
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The economics of future membrane desalination processes and applications
… from the feed stream into a more concentrated solution. Although unaddressed in literature this energy penalty is an important and distinguishing factor between FO and other desalination technologies. In the case of seawater, it is shown to put FO at a disadvantage that makes it difficult to …
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Influence of Electrostatic and Intermolecular Interactions on the Solution Behavior and Electrospinning of Functional Nanofibers
The solution rheological and electrospinning behavior of a series of charge-containing polymers, surface-active agents, and carbon nanotube composites was studied to investigate the effect of intermolecular interactions, including electrostatic interactions, hydrogen bonding, surface activity, and …
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Chloride penetration in concrete: evaluation of rapid conductivity methods and development of a service life prediction model for marine conditions
… and cover depth is needed. Short-term electrical conductivity methods are rapid alternatives to the time-consuming diffusion tests for the characterisation and quality control of concrete mixtures. To estimate the long-term behaviour of a concrete mixture in marine conditions, however, and propose …
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Characterization and modification of electrospun fiber mats for use in composite proton exchange membranes
… electrospun fibers from knowledge of the polymer solution properties and electrospinning operating conditions alone. Changing a single fluid or processing parameter can affect the jet and fiber formation through several mechanisms. For example, using a different solvent can change several …
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Core-Sheath Differentially Biodegradable Nanofiber Structures for Tissue Engineering
… various material and process variables such as solution concentration, solvent type, solution flow rate, and applied voltage. Two natural polymers (collagen and gelatin) and one synthetic biodegradable polymer (PCL) were used to develop the proposed structures. The factors that affected the …