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Showing 1 to 18 of 18 for “"electro-osmotic"”.
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Microfluidic Electro-osmotic Flow Pumps
… previously developed thin film technologies, an electroosmotic flow (EOF) pump was incorporated in a microfluidic liquid chromatography device. An EOF pump was chosen because of its simple design and small size. EOF pumps fabricated on silicon and glass substrates were evaluated. The experimental …
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Numerical Simulations in Electro-osmotic Flow
… the physical driving mechanism that exists in electro-osmotically generated flow with large channel diameter-to-Debye length ratios (Z). The physics of the flow field were compared between the moving wall model (MWM) and electro-osmotic flow (EOF) at Reynolds numbers of 1 and 1800, and Z > …
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Thermally Developing Electro-Osmotic Convection in Circular Microchannels
<p>Thermally developing, electro-osmotically generated flow has been analyzed for a circular microtube under imposed constant wall temperature (CWT) and constant wall heat flux (CHF) boundary conditions. Established by a voltage potential gradient along the length of the microtube, the …
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Electrical Treatment of Clays
… original experimental investigation program on electro-osmotic flow in clays was carried out for the present thesis. Short-term steady state electro-osmotic flow tests were performed on specimens of Wyoming bentonite/Ottawa sand mixture. Long-term steady state electro-osmotic flow tests were …
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Development of an electro-kinetically driven integrated DNA profile separation and detection system
… of manufacturing.Described is the application of electro-osmotic pumping through a gel supported reagent matrix, where a silica monolith was used to support both the electro-osmotic pumping mechanism and the extraction of DNA from cellular debris. The gel supported system also enabled the delivery …
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Transport and Structure in Fuel Cell Proton Exchange Membranes
… poly(imide) (sPI) copolymers than in Nafion. Electro-osmotic drag coefficient (ED number of water molecules conducted through the membrane per proton) studies confirmed that the water in sulfonated wholly aromatic systems is more tightly bound within the copolymer morphology. Nafion, with a …
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Shear Dispersion in Double-Porosity Systems
… the combined effects of pressure-driven and electro-osmotic flows, and v) a capillary tube with a porous wall under the combined effects of pressure-driven and electro-osmotic flows. For determination of the dispersion coefficients, first, a two-dimensional coupled solute transport model is …
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Development of new adaptive materials based on spiropyran molecular photoswitches
… chip and the system filled with an acid electrolyte. When a voltage was applied at the two ends of the encased monolith, electro-osmotic flow was generated and the flow rate shown to be variable upon white light exposure as a consequence of the formation of the SP form and the …
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Water transport in fuel cell membranes measured by laser interferometry
(cont.) The coefficients of electro-osmotic drag were found to increase with the increasing water content, which indicates that the Grotthuss mechanism of proton transfer is not active in the membranes with low water content. The successful evaluation of these coefficients has not only showed the …
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Experimental investigation of induced-charge electro-osmosis
… analyze the general phenomenon of induced-charge electro-osmosis (ICEO), nonlinear electro-osmotic slip generated when an electric field acts on its own induced charge around a polarizable surface, in the context of microfluidics. Simple ICEO flows are first observed around a platinum wire in a …
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Numerical simulation of multi-scale transport processes and reactions in pem fuel cells using two-phase models
… At low current densities, the temperature, electro-osmotic drag, irreversible and losses are quite low but the membrane phase conductivity showed a decreasing pattern along the length of the cathode. At higher current density (0.89 A/cm2), a sharp decrease in the current was observed due to …
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Integrated DNA extraction and amplification on a microfluidic device
… then be incorporated upstream of capillary gel electrophoresis and fluorescence-based detection for development of a completely integrated genetic analysis system.DNA extraction was performed using a silica substrate with both hydrodynamic and electro-osmotic pumping (EOP), resulting in maximum …
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Nanopore-Based Readout of Encoded DNA Nanostructures
… flows due to externally applied pressure and electro-osmotic flows (EOF) along the pore walls. The ability to prevent folded entry into the pore is crucial for decoding of attached modifications as it facilitates the identification and classification of secondary current peaks. In the …
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STUDY OF COLLOIDAL INTERACTIONS MEDIATED BY BIOMOLECULAR RECOGNITION AND BY ELECTROKINETIC FLOWS.
… phenomena - biomolecular recognition and electrokinetic flows. The general purpose of this investigation is twofold: while we investigate new mechanisms providing new forms of colloidal interactions, we also exploit the measured interactions to better describe the phenomena at their …
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Test analysis & fault simulation of microfluidic systems
… namely, impedance spectroscopy and Levich electro-chemical sensors have been investigated as general methods of microfluidic test, each of which has been shown to be sensitive to a multitude of fault. Each method has successfully been implemented within the simulation environment and each …
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A Computational Model of the Ocular Lens
… as Couette flow with an extra term to capture electro-osmotic flow. The fluid flow through the fibre cell membrane and surface membrane was modelled as transmembrane fluid flow. The governing equations account for the structural properties of the lens, such as the tortuosity of the …
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Structure, property and transport mechanism of water and electrolytes in graphene nanopores
… Additionally, several orders of magnitude larger electro-osmotic water flow rate was observed in the subcontinuum regime (pore radius less than 0.9 nm) compared to that of porous alumina or carbon nanotube membranes. Since many applications of graphene nanopores, such as single molecule sensing …
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Topological Chaos and Mixing in Lid-Driven Cavities and Rectangular Channels
… in a rectangular channel with surface grooves or electro-osmotic flow in a rectangular channel with variations in surface potential. In this dissertation, the occurrence of topological chaos in unsteady two-dimensional flows as well as steady three-dimensional flows without internal rods is …