Results 131 to 140 of about 3,437 (178)
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Microelectromechanical Systems, 2002
Two dimensional, time-independent and time-dependent electroosmotic flows driven by a uniform electric field in rectangular cavities with uniform and non-uniform zeta potential distributions along the cavities’ walls are investigated theoretically. The time-independent flow fields are computed with the aid of Fourier series.
Shizhi Qian, Haim H. Bau
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Two dimensional, time-independent and time-dependent electroosmotic flows driven by a uniform electric field in rectangular cavities with uniform and non-uniform zeta potential distributions along the cavities’ walls are investigated theoretically. The time-independent flow fields are computed with the aid of Fourier series.
Shizhi Qian, Haim H. Bau
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Electroosmotic Flow through an Annulus
Journal of Colloid and Interface Science, 2000The electro-osmosis through an annulus is investigated. The electric potential and flow velocity profile are obtained by solving the linearized Poisson-Boltzmann equation and the Stokes equation. Both the thin and thick double layer limits are analyzed.
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Enhancement of electroosmotic flow in capillary electrochromatography
ELECTROPHORESIS, 2001A major impediment to enhancing the speed of separation in capillary electrochromatography (CEC) is the upper limit on the electroosmotic flow (EOF) velocity by the maximal zeta potential of the chromatographic surface. Here, a new approach to speeding up EOF, suggested by Yang and El Rassi (Electrophoresis 1999, 20,18-23), is examined critically.
E, Wen, A S, Rathore, C, Horváth
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Electrokinetic chromatography without electroosmotic flow
Journal of Chromatography A, 1997This review summarizes the various aspects of conducting electrokinetic chromatography in coated columns with suppressed electroosmotic flow. The specific features of the technique will be presented and the potential applications explored. The equations of migration, resolution and zone spreading for neutral solutes will be presented, compared, and ...
G M, Janini, H J, Issaq, G M, Muschik
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Electroosmotic flow mixing in zigzag microchannels
ELECTROPHORESIS, 2007AbstractIn this study we performed numerical and experimental investigations into the mixing of EOFs in zigzag microchannels with two different corner geometries, namely sharp corners and flat corners. In the zigzag microchannel with sharp corners, the flow travels more rapidly near the inner wall of the corner than near the outer wall as a result of ...
Jia-Kun, Chen, Ruey-Jen, Yang
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Electroosmotic flow and injection: Application to conductimetry
Talanta, 1994Electroosmotic solution propulsion and sample injection using fused silica tube was investigated. Capillary tube dimensions were 50-100 microm i.d. by 4-7 cm length with a break in the capillary wall near one end through which electrolytic contact with the capillary solution was established. The applied field was typically 150 V/cm.
L, Tang, C O, Huber
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Electroosmotic flow with Joule heating effects
Lab on a Chip, 2004Electroosmotic flow with Joule heating effects was examined numerically and experimentally in this work. We used a fluorescence-based thermometry technique to measure the liquid temperature variation caused by Joule heating along a micro capillary. We used a caged-fluorescent dye-based microfluidic visualization technique to measure the electroosmotic ...
Xiangchun, Xuan +3 more
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Electroosmotic flow in poly(dimethylsiloxane) microchannels
Journal of Chromatography A, 2005This paper reports on the study of electroosmotic flow (EOF) in poly(dimethylsiloxane) (PDMS) microchannels on the basis of indirect amperometric detection method. Gradual increase of EOF rate in freshly prepared PDMS microchannels was observed with the running buffer of phosphate buffer solution (PBS).
Ning, Bao +4 more
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Measuring Electroosmotic Flow in Microchips and Capillaries
2006Electrophoretic migration and electroosmotic flow (EOF) combine to determine the migration rate of charged compounds in capillary electrophoresis (CE) and microchip capillary electrophoresis (MCE). Uncontrolled and unmeasured changes in EOF will lead to irreproducible peak migration times and poor peak quantitation.
S Douglass, Gilman, Peter J, Chapman
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Japanese Journal of Applied Physics, 1999
Growth of electroosmotic circulation (EOC) of a liquid in a closed capillary, which is generated after the application of an electric field between the two electrodes which cover the ends of the silica capillary, is examined numerically.
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Growth of electroosmotic circulation (EOC) of a liquid in a closed capillary, which is generated after the application of an electric field between the two electrodes which cover the ends of the silica capillary, is examined numerically.
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