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Showing 1 to 20 of 21 for “"Ionic solutions"”.
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Equilibrium and dynamics of ionic solutions
… plasmic membrane. Nervous influx is carried by ionic currents flowing both across the membrane and inside the neuron under the membrane. It propagates at velocities comprised between 0.1 m/s and 100 m/s. The present study ambitioned to build a model for the propagation of nervous influx based on …
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Corrections to the Debye-Hückel Theory
… for the potential of average force is applied to ionic solutions, and gives an expression for the activity coefficient through order n; the electron-gas result also enables us to extend the Fuoss-Onsager theory of the conductivity of ionic solutions to the case of asymmetric solutes. Some …
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The Surface Modification of Single Crystal Semiconductors via Solubility Equilibria
… corrosion, and surface passivation in ionic solutions is of particular importance in the development of efficient, long-lived liquid junction cells. This study demonstrated that solubility equilibria provide a simple, versatile means of modifying the surface of a semiconductor.
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Fluid Characterisation Using Microfluidic Impedance Spectroscopy for Remote Health Monitoring
… such devices can be used to characterise aqueous ionic solutions by using impedance spectroscopy to directly measure their electrical properties. Impedance spectroscopy is a very well-established technique for the characterisation of solids but is less commonly used for liquids. Here the …
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Development, Analysis, and Comparison of Electromechanical Properties and Electrode Morphology of Ionic Polymer Metal Composites
… as indispensable structures. Among these, the Ionic Polymer Metal Composites (IPMC), with their large bending deformation and relaxation characteristics at very low voltages are attractive as transducers in many areas of application. The actuation and sensing properties of IPMC have been sought …
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Sablefish (Anoplopoma fimbria) sperm: The physiology of activation and the development of a cryopreservation protocol
… tests. Sperm were activated with ionic (NaCl, KCl, MgSO4 and CaCl2) and non-ionic (urea and glucose) solutions of varying osmolalities. KCl and NaCl activated sperm at the lowest osmolalities, followed by MgSO4, urea, glucose, and CaCl2. Compared to NaCl and KCl, non-ionic …
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Microscopic Physics of Electrical Double Layers
… exists at the phase boundaries of electrolyte solutions, where counterions from solution preferentially accumulate to screen surface charges. Due to the ubiquity of electrolytes, the electrical double layer plays a central role in many fields in science and engineering, including colloid …
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Thermodynamic properties of 1-ethyl-3-methylimidazolium ethyl sulphate with nitrogen and sulphur compounds at T = (298.15 - 318.15) K and P = 1 bar
Submitted in fulfillment of the academic requirements for the Masters of Applied Science (Chemistry), Durban University of Technology, Durban, South Africa, 2016.
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The atomisation of detergent slurries
… and parallel work was undertaken with water, ionic solutions and chalk slurries. Six centrifugal pressure nozzles were used and the drop-size distributions correlated as a function of fluid properties, pressure, fiowrate, feed temperature, and nozzle characteristics. Measurements were made …
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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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Extraction of aromatic solvents from reformates and paint solvent wastes during ionic liquids
Submitted in the fulfilment of the requirement for the Degree of Doctor of Philosophy: Chemistry, Durban University of Technology, Durban, South Africa, 2016.
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Thermodynamic properties of phosphonium-based ionic liquid mixtures at different temperatures
Submitted in the fulfillment of the academic requirements for the degree of Masters of Applied Science in Chemistry, Durban University of Technology. Durban, South Africa, 2018.
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Materials and coatings derived from the polymerizable ionic liquid surfactants 1-(2-acryloyloxyundecyl)-3-methylimidazolium tetrafluoroborate and 1-(2-acryloyloxyundecyl)-3-methylimidazolium 2-acrylamido-2-methyl-propylsulfonate
<p>Polymerizable ionic liquid surfactants were synthesized and polymerized, yielding engineered advanced polymers that can be tailored for diverse applications. First, 1-(2-acryloyloxyundecyl)-3-methylimidazolium tetrafluoroborate (IL-BF<sub>4</sub>) was synthesized and was copolymerized with …
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Materials and coatings derived from the polymerizable ionic liquid surfactant 1-(2-Acryloyloxyundecyl)-3-methylimidazolium bromide
<p>The polymerizable ionic liquid surfactant, 1-(2-acryloyloxyundecyl)-3- methylimidiazloium bromide (IL-Br) was synthesized. The ternary phase diagram of the ILBr/ MMA/water system was constructed at 25 and 60 °C. Several microemulsion polymerizations were carried out, yielding materials that …
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Excess molar volume and isentropic compressibility for binary or ternary ionic liquid systems
Submitted in fulfilment of the requirements of the Degree of Doctor of Technology: Chemistry, Durban University of Technology, Durban, South Africa, 2010.
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Cost Effective Synthesis of Ionic Liquids and Their Thermal Properties
<p>Ionic liquids (ILs) are liquid organic salts at room temperature which are composed of only ions (cations and anions). Ionic liquids are regarded as “novel solvents” and have been gaining attention as alternatives to volatile molecular organic solvents. Ionic liquids have outstanding properties, …
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The Role of Time Variant Resistance and Electromotive Force in Ionic Systems Related to Cell Membranes: The Excitability Properties of Frog Skin and Toad Bladder
… force (emf.) associated with the gradients of ionic concentrations, and an ohmic potential difference (IR drop) arising when current flows through the system. In order to illustrate the meaning and significance of these two terms, we have considered the voltage-current relationships in certain …
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Extraction of caffeine from spent coffee grounds using ionic liquids
Submitted in fulfillment of the requirements for the degree of Master of Engineering: Chemical Engineering, Durban University of Technology, Durban, South Africa, 2022.
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Mechanisms of Liquid-Metal-Activated Aluminum-Water Reactions and Their Application
… the microscale. It was then discovered that in ionic aqueous solutions, liquid-phase eGaIn emerges from solution under specific ambient conditions. From this discovery, a method for recovering and recycling the eGaIn was developed, using NaCl in moderate concentrations as the only additive. In …
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