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 21 for “"ionic concentration"”.
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Nonlinear Optical Properties and Structural Characteristics of Ionically Self-Assembled Nanoscale Polymer Films Influenced by Ionic Concentration and Incorporation of Monomer Chromophores
Ionically self-assembled monolayer (ISAM) films are typically an assemblage of oppositely charged polymers built layer by layer through coulombic attraction utilizing an environmentally friendly process to form ordered structures that are uniform, molecularly smooth, and physically robust. ISAM …
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Chondrocyte metabolism and matrix nano-electromechanics : the response to cartilage tissue shear deformation
… and dynamic shear stiffness as a function of the ionic concentration of bath solution. Measured shear properties were dependent on ionic concentration; the shear modulus increased and the phase angle between stress and strain decreased with decreasing ionic concentration.
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Vibrational spectroscopy studies of interdiffusion in polymer laminates and diffusion of water into polymer membranes.
… diffusion of pure water and also water from some ionic solutions into sulphonated polyetherethersulphone/polyethersulphone, SPEES/PES has been studied using Fourier transform infrared-attenuated total reflectance, FTIR-ATR spectroscopy. The effects of sulphonation level, annealing temperature, …
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DEVELOPMENT OF AN AUTOMATION AND CONTROL SYSTEM FOR A COAL SPIRAL
… washability characteristics, and feed slurry ionic concentration. With a full-scale compound spiral programmed to achieve a specific gravity of separation at 1.65 by an automatic adjustment of the splitter position, the actual D50 values achieved for two separate tests were 1.64 and 1.73. The …
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Increased Utility of pH Sensitive Indicators as High Concentration CO2 Detectors Through the Use of Polyelectrolyte Complexes as Stabilizing Media
… biomedical devices are packaged under high concentrations of carbon dioxide (CO<sub>2</sub>) which can lower the pH of the packaging environment. This is similar to the CO<sub>2</sub> chemistry responsible for ocean acidification.<sup>3</sup> Dye molecules that are sensitive to environmental …
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Experimental investigation of interfacial tension in two-phase system involving methane and water
… and conductivity depend significantly on the ionic concentration of NaCl presents. Resistivity decreases with increasing NaCl concentration from 0.22 Ω-m at 2.9 wt% NaCl to 0.075 Ω-m at 10.7wt% NaCl, which shows the possibility of corroding the pipe in the case of the pipeline system. The …
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Dielectrophoresis study of electroporation effects on dielectric properties of biological cells
… electroporation is performed in media with lower ionic concentration than cells cytoplasm, their internal conductivity decreases after electroporation depending on the intensity of applied pulses. We also observe that with reversible electroporation there is a limit on the decrease in the cells’ …
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Molecular mechanism, binding free energy, and sequence selectivity of intercalation of doxorubicin and DNA
… drug? How do the aqueous environment and ionic concentration impact the intercalation process? A comprehensive microsecond time-scale molecular dynamics study in an explicit aqueous solvent has been performed to address the above-raising questions. In this study, DOX interacts with …
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Functional Block Copolymers via Anionic Polymerization for Electroactive Membranes
Ion-containing block copolymers blend ionic liquid properties with well-defined polymer architectures. This provides conductive materials with robust mechanical stability, efficient processability, and tunable macromolecular design. Conventional free radical polymerization and anion exchange …
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Alumina-aluminum Titanate-titania Nanocomposite: Synthesis, Sintering Studies, Assessment Of Bioactivity And Its Mechanical And Electrical Properties
… Simulated Body Fluid (SBF), which has the same ionic concentration as that of human plasma. Effects of biodegradation and change in mechanical properties of the composite when kept in SBF and maintained in a static condition were studied in terms of weight loss, change in the pH of the acellular …
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The partitioning and mobility of metals in the Blesbokspruit
… of Cl⁻, SO₄²⁻, Na⁺ and Ca²⁺. These elevated salt concentrations are derived from the discharge of saline effluent into the Blesbokspruit by the Grootvlei Proprie ary Mines Ltd and are responsible for the increase in electrical conductivity downstream of the mine. The generally mildly alkaline …
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Molecular mechanisms of salt and osmotic stress tolerance in Frankia strains isolated from Casuarina trees
… of the arable land will be salinized. The hyper-ionic and hyper-osmotic stresses associated with salt-affected soils threaten the ability of cells to maintain optimal turgor pressure and intracellular ionic concentration for growth and functioning. The nitrogen-fixing soil actinobacterium Frankia …
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Effects of Perfusate Solution Composition on the Relationship between Cardiac Conduction Velocity and Gap Junction Coupling
… comparison study showed differing extracellular ionic concentrations of the perfusates, specifically sodium, potassium, and calcium ([Na+]o, [K+]o, and [Ca2+]o), there was a lack of understanding why certain combinations of the aforementioned ions led to specific CV changes. However, more …
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Effects of hypersalinity on the behaviour, physiology and survival of commercially important North Sea crustaceans
… the three test species The combined volume and concentration of this discharge has the potential to raise the salinity in the local environment and these studies have focused on the possible ecological and commercial implications of such changes.Each species was found to have a threshold value …
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Materials and processes for the optical additive manufacturing of advanced organic/inorganic nanocomposites for the mask-less plating of insulator and semiconductor substrates, and microfluidic devices
… properties. Moreover, a fine tuning of the concentration of the gold salt allows the resin polymerization without suffering any inhibition of the gold precursor. A similar approach, taking advantage of the combination with photoreduction of a gold precursor (HAuCl4), can be achieved using a …
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Diamphotoxin : the arrow poison of the !Kung Bushmen
… showed that the pupae contained a 3,7 S cationic protein which caused haemolysis and, after intramuscular injection, local paralysis followed by death. By intravenous lethality assay, one 200 mg pupa contained 20 000 mouse lethal doses. Assays for the toxin were developed based upon …
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Electrostatic control of microfluidic systems for enhancement of nanoparticle separations and FET nanobiosensors
… contaminants from water. However, given that ionic mobility (by far) exceed those of the suspended matter, the ions redistribute rapidly to overwhelm any electrophoretic effects within the system. Any attempt at capturing sub-micron particles by electrostatic means is drastically limited due …
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Effect of boiling on deposition of metallic colloids
… microlayer as well. During the evaporation the concentration gradient of a non-volatile species is created, which induces osmotic pressure. The osmotic pressure developed inside the microlayer draws more particles inside the microlayer region or towards contact line. The colloidal escape time is …
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An investigation into the impact of residual reagents on flotation in response to process water recirculation
… copper and nickel mineral grade, residual concentrations of collector and depressant pre and post flotation as well as particle settling of the tails. For all test conditions relative to the base condition where none of the varied reagents were added, the solid and water recovery increased, …
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Fluid Characterisation Using Microfluidic Impedance Spectroscopy for Remote Health Monitoring
… device capable of continually determining the concentration of multiple key biomarkers in sweat, including electrolytes and metabolites, is a substantial hurdle for RHM. This is an active area of research, and most sensors in the literature use either colorimetric or electrochemical detection. …
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