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Showing 1 to 20 of 23 for “"Electroosmosis"”.
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Electrokinetic and Chemical Aspects of Transport of Chloride Brines Through Compacted Smectite Layers at Elevated Pressures (Electroosmosis, Streaming, Conductivity)
Solutions of NaCl and NaCl-CaCl were forced through clay plugs made by compacting the 0.2 to 2.0 micron size fraction of Cheto montmorillonite. The concentration of NaCl solution was either 1.10 m or 1.087 m, and that of NaCl-CaCl(,2) solution was 0.92 m in NaCl and 0.075 m in CaCl(,2). Clay plug …
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Design and fabrication of a new 3D AC-electroosmotic micropump
… Electrokinetic micropumps in particular AC electroosmosis pump can be used to pump fluids using planar electrodes which induce electrical forces on the fluid. However, planar electrodes have limited pumping capability of the micropump.<br/><br/>In this thesis a new design for the AC …
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Electroosmotic Soft Actuators
… the first paper-based soft actuator driven by electroosmosis. To accomplish this, research breakthroughs were made in the fields of electrokinetic pumping and device manufacturing using soft materials. Electroosmosis is an electrically induced microfluidic flow phenomenon. When an electric …
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On-chip multi-dimensional biomolecule separation using multi-layer microfabricated valves
… were identified; including channel passivation, electroosmosis control, IEF linearity control, and detection enhancement. The result can be used for the filtration of high-abundance proteins, which used to be done by affinity columns. Also, it can be used for much possible integration between …
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Particle Manipulation Using Electric Field Gradients in Microdevices
… demonstrated controlled movement caused by electroosmosis and dielectrophoresis with a net motion caused by a dielectrophoretic force. In the second application, the separation capabilities of different stages of breast cancer cells from the same cell line were tested using contactless …
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TWO-DIMENSIONAL FLUIDIZATION OF NANOMATERIALS VIA BIOMIMETIC MEMBRANES TOWARDS ASSISTED SELF-ASSEMBLY
… was observed in the particle tracks due to the electroosmosis in the system. This proved that SLBs could be used as a two-dimensional fluid platform for nanomaterials and electroosmosis can be used to manipulate the motion of the Q-dots once they are tethered to the membrane.</p> <p>Next, we set …
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Novel mechanisms of DC and kilohertz electrical stimulation
… culture experiments through a mechanism called electroosmosis. Modulating water exchange rate across BBB is of broad interest in neurological diseases such as dementia, Alzheimer’s, and stroke where the brain clearance system is disrupted. Investigating the effect of electrical stimulation on …
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Alternating Current Electroosmotic Micropumping Using A Square Spiral Microelectrode Array
… array which uses the principal of AC electroosmosis (EO), ions driven along microelectrode surfaces by coulomb forces produced by tangential electric fields. These ions, when driven, induce a net fluid motion due to viscous drag forces. Three submerged microelectrode wires were …
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Use of Spatially Non-Uniform Electric Fields for Contact-Free Assembly of Three-Dimensional Structures from Colloidal Particles
… and electrohydrodynamic forces (electroosmosis) to shape three-dimensional colloidal structures. Formation and stabilization of close-packed three-dimensional structures from colloidal silica was demonstrated, using gelation of pluronic F-127 to preserve medium structure against …
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Electrokinetic phenomena in nanopore transport
… results in electrically-driven flows called electroosmosis. Using a setup which combines the nanopore with an optical trap to measure forces with piconewton sensitivity, we elucidate the electroosmotic coupling between multiple DNA molecules inside the confined environment of the pore. …
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Investigation of Reactive Electrokinetic Processes for Permeability Reduction in Hardened Cement Paste
… transport processes (hydraulic pressure flow, electroosmosis, and ionic conduction). Model predictions correlated well with observed cement paste microstructures and permeability measurements. In addition to conducting hydraulic permeability tests, impedance measurements were also used to …
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Electrical-phenotyping of the bacterial envelope using microfluidics
… interplay of electrothermal and induced charge electroosmosis (ICEO) flows, which can interfere DEP operations but are often overlooked in the design of iDEP systems. The effects of fluidic ionic strength, applied electric field, and insulating channel geometry on temperature rise and fluid …
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Electric Field Effects on Bacterial Deposition and Contaminant Sorption as Drivers of Bioavailability
… electrokinetic phenomena (electro-migration, electroosmosis, and electrophoresis) have the potential to promote contaminant bioavailability by both mobilizing bacteria and contaminants. This thesis hence tested electrokinetic factors affecting bacterial transport and deposition and the …
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Particle Transport in Confinement: Nonlinearity, Compressibility, and Steric Effects
… The competition between electrophoresis and electroosmosis results in an unexpected voltage-tunable trapping of particles inside channels. This is the first kind of particle trapping using the nonlinear electrokinetic effect and can be potentially used for particle separation. Using the same …
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Ocular Iontophoresis of Nanocarriers for Sustained Drug Delivery to the Eye
… the transscleral transport study suggested that electroosmosis was the major flux-enhancing mechanism in the iontophoretic transport of macromolecules of low charge to mass ratios such as micellar carriers. However, highly negatively charged macromolecules were more effectively delivered by the …
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Applicazione delle tecniche elettrosmotiche alla consolidazione dei fanghi di risulta dei processi mineralurgici
… hydraulic conductivity. The research into the electroosmosis phenomenon started from the hypothesis that its application could reduce the consolidation time of the slurry material typically deposited in the tiling dams. The technique can be adopted to realize barriers of consolidated and low …
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Surface characterization of self-assembled monolayers for applications of selective ionic transport through nanoporous membranes
… layers, the volumetric flow ratio (VFR) between electroosmosis and pressure driven flow is inversely proportional to 1⁄r^2 , indicating the advantages of utilizing electrokinetics for systems with small characteristics length scales. Bare solid surfaces of metal and metal oxides tend to adsorb …
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Nonlinear ion transport at high electric currents in shock electrodialysis and ion-intercalation memories
… layer (EDL) thickness, captures the phenomena of electroosmosis, diffusioosmosis, and water dissociation, and incorporates more realistic boundary conditions. The model is well consistent with experiments of binary electrolytes, and can explain the selective removal of multivalent cations from …
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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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Electrokinetically Driven Mixing in a Microchamber for Lab-on-a-Chip Applications
Electrokinetically Driven Mixing in a Microchamber for Lab-on-a-Chip Applications Narayan Sundaram Abstract Micro-Total-Analysis-Systems (μTAS) have been the focus of recent world wide research due to their varied applications. Much of the motivation for the development of μTAS stems from …
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