Results 171 to 180 of about 6,287 (220)

Electroosmotic Flow in Microchannels with Nanostructures

ACS Nano, 2011
Here we report that nanopillar array structures have an intrinsic ability to suppress electroosmotic flow (EOF). Currently using glass chips for electrophoresis requires laborious surface coating to control EOF, which works as a counterflow to the electrophoresis mobility of negatively charged samples such as DNA and sodium dodecyl sulfate (SDS ...
Takao, Yasui, Noritada, Kaji, Mohamad Reza, Mohamadi, Yukihiro, Okamoto, Manabu, Tokeshi, Yasuhiro, Horiike, Yoshinobu, Baba   +6 more
openaire   +2 more sources

CHARACTERIZATION OF ELECTROOSMOTIC FLOW IN MICROCHANNELS

International Journal of Computational Engineering Science, 2003
This paper presents experimental and theoretical studies of the electroosmotic flow in microchannels. The current monitoring method is used to determine the average flow velocity and the ζ potential by measuring the current-time relationship during electrolyte displacement process.
C. Yang, T. N. Wong, Y. L. Leu, K. T. Ooi, J. C. Chai   +4 more
openaire   +1 more source

Chaotic Electroosmotic Flow

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
openaire   +1 more source

Enhancement of electroosmotic flow in capillary electrochromatography

ELECTROPHORESIS, 2001
A 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
openaire   +2 more sources

Electroosmotic Flow through an Annulus

Journal of Colloid and Interface Science, 2000
The 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.
openaire   +2 more sources

Electrokinetic chromatography without electroosmotic flow

Journal of Chromatography A, 1997
This 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
openaire   +2 more sources

Electroosmotic flow mixing in zigzag microchannels

ELECTROPHORESIS, 2007
AbstractIn 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
openaire   +2 more sources

Electroosmotic flow and injection: Application to conductimetry

Talanta, 1994
Electroosmotic 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
openaire   +2 more sources

Manipulation of electroosmotic flow in capillary electophoresis

Journal of Chromatography A, 1993
This paper reports the use of surfactant and polymer-C18 coated capillaries that allow manipulation of electroosmotic flow (EOF). Although this approach to the control of EOF involves the preparation and use of multiple capillaries, all the coatings were prepared by a single procedure.
X W, Yao, D, Wu, F E, Regnier
openaire   +2 more sources

Electroosmotic flow with Joule heating effects

Lab on a Chip, 2004
Electroosmotic 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, Bo, Xu, David, Sinton, Dongqing, Li   +3 more
openaire   +2 more sources