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Showing 1 to 20 of 33 for “"Electroosmotic Flow"”.
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Microparticle Influenced Electroosmotic Flow
<p>The influence of microparticles on electroosmotic flow was investigated experimentally and numerically. Experiments were conducted using four different particle types of varying chemical composition, surface charge and polarity. Each particle type was tested at five different volume fractions …
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The modeling and analysis of the electroosmotic flow, diffusion, electrophoretic migration, and adsorption mechanisms of charged and uncharged adsorbates in capillary electrochromatography systems employing charged adsorbent particles - comparisons between theory and experiments
… electrically-driven mass transport mechanisms of electroosmotic flow (EOF) and electrophoretic migration, as well as the interplay of these transport mechanisms with the diffusion and adsorption mechanisms of charged and uncharged solutes in charged chromatographic media employed in capillary …
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Distribution of ammonium nitrate as nitrogen containing nutrient for in-situ biodegradation by means of electrokinetics
… processes, and, more specifically, the induced electroosmotic flow, for achievement of uniform distribution of nutrients for in-situ bioremediation in a natural clayey silt was investigated. Three different concentrations of ammonium nitrate solution were used. The experiment showed the …
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A doppler electrophoresis instrument for macromolecular characterizations
… in solution where gel characteristics and electroosmotic flow need not be considered.
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Electrokinetic separations in fused silica capillaries
… an increase in electrolyte concentration reduces electroosmotic flow. This increases the relative velocity difference between two zones and, thereby, minimizes the efficiency required for unit resolution. Forced air convection minimizes the loss in efficiency observed as capillaries with larger …
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Numerical Modeling of Microscale Mixing Using Lattice Boltzmann Method
… The study involves two mixing methods, namely, electroosmotic mixing and magnetic assisted mixing. A single component LBM model is developed to study electroosmotic flow in a square cavity. Mixing is studied by introducing two types of tracer particles in the steady electroosmotic flow and …
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Fabrication of Polymeric Microfluidic Devices for Protein Analysis
… surfaces exhibited substantially reduced electroosmotic flow and nonspecific adsorption of proteins. Both column efficiency and migration time reproducibility were one order of magnitude better with derivatized PMMA µCE devices compared to untreated versions. Fast, reproducible, and …
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Towards Ion Channel Based Nanofluidic Devices: Simulations of Water and Electrolyte Transport in Nanotubes and Channels
… profiles of K+ and Cl- ions give rise to an electroosmotic flow in the presence of an external electric field indicating the presence of an electric double layer at net zero surface charge, contrary to the expectations from classical continuum theory. I-V curves in a channel-bath system using …
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Electric field-assisted immobilization and alignment of biomolecules
… used were identified as dielectrophoresis and AC electroosmotic flow. To minimize AC electroosmotic flow, a new 3D electrode configuration was designed. Thus, the influence of experimental parameters on the dielectrophoretic force and the associated molecule movement could be studied. Permanent …
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Core-based hyperbranched polyethyleneimine coating in capillary electrophoresis
… fused silica surface can be used to control the electroosmotic flow (EOF), to minimize the interaction of analytes with the capillary surface and to modify the selectivity. , core-based hyperbranched polyethyleneimine (CHPEI) polymer utilized as either a static or dynamic coating in this study. A …
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Collocation Based Meshless Methods for Microelectromechanical Systems
… method (BCM) were applied to solve the fluid flow in the MEMS devices. Combining the fluid flow module with the solver for the Poisson and Nernst-Planck (PNP) equations, a tool for the simulation of ion transport in the framework of the meshless methods has been developed. Furthermore, this …
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Study of disposable microdevices for DNA electrophoresis
… evincing a low, almost negligible amount of electroosmotic flow. The separation of the dye and DNA was accomplished with good fidelity, allowing for identification of the various substitutents of the loaded sample.
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Ion current modulation in bio-mimetic channel systems
… different DNA nucleotides’ packing geometry, the electroosmotic flow (EOF) in nanopores. These works represent potential applications of improving nanopore sequencing distinguishability.
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An investigation of chemiluminescent miniaturised analytical systems
… emission intensity and the modification of electroosmotic flow is discussed.A quantitative analysis of codeine was then successfully performed using this set-up. The points for the codeine concentrations of 5x10⁻⁷ to 1x10⁻⁴ mol 1⁻¹ were plotted to give a linear calibration plot. The equation …
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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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Development of an Ionically-Assembled On-Column Enzyme Reactor for Capillary Electrophoresis
… length of the capillary under the influence of electroosmotic flow and is detected amperometrically at the capillary outlet. The optimal response, kinetics, and stability for the enzyme reactor are determined through characterization of several parameters including the concentration ratio of …
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Polymer Micro- and Nanofluidic Systems for In Vitro Diagnostics: Analyzing Single Cells and Molecules
… – surface charge density, zeta potential and electroosmotic flow. This study provided information on possible routes that can be adopted to engineer proper wall chemistry of polymer nanochannels for the enhancement or reduction of solute/wall interactions in a variety of relevant …
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Theoretical and practical aspects of linear and nonlinear model order reduction techniques
… a case study of model reduction applied to electroosmotic flow of a marker concentration pulse in a U-shaped microfluidic channel, where the marker flow in the channel is described by a three-dimensional convection-diffusion equation. First, we demonstrate the effectiveness of the modified …
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Pressure-driven and electroosmotically-driven liquid chromatographic separations in packed fused silica capillaries
… chromatographic system under pressure-driven flow is studied and the improved permeability of micropacked capillary columns is exploited in the manufacture of several 25 to 30cm columns which achieve high efficiencies with relatively low pressure drops. Van Deemter plots illustrate the …
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High fidelity simulations of electrokinetic phenomena in microfluidic devices
<p>Electroosmotic flow with electrokinetic effects is the primary method of fluid handling in micro-total analysis systems. Under external applied electric fields, electrokinetic micro-devices allow for innovative functionality in a wide range of microfluidic applications including sample …
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